FUJII Daiji

Researcher Information

URL

https://archi.hiro.kindai.ac.jp/laboratory/SAL/teacher.html

J-Global ID

• 200901088381535048

Research Interests

• Structural analysis   Computational morphogenesis   Optimal design   Structural optimizaton   Computational mechanics   Structural mechanics   

Research Areas

• Social infrastructure (civil Engineering, architecture, disaster prevention) / Building structures and materials

Academic & Professional Experience

• 2008/04 - Today  Kindai UniversityFaculty of EngineeringProfessor
• 2002/04 - 2008/03  Kindai UniversityFaculty of EngineeringAssociate professor
• 1999/12 - 2002/03  The University of TokyoSchool of EngineeringAssistant professor
• 1989/12 - 1999/11  Hiroshima UniversityFaculty of EngineeringAssistant professor
• 1998/03 - 1999/03  Visiting Researcher, Faculty of Engineering, University of Michigan
• 1989/04 - 1989/11  Research Fellowship, Japan Society for the Promotion of Science

Education

• 1986/04 - 1989/11  Hiroshima University  Graduate School of Engineering  構造工学専攻 博士後期課程
• 1984/04 - 1986/03  Hiroshima University  Graduate School of Engineering  構造工学専攻 博士前期課程
• 1979/04 - 1984/03  Hiroshima University  Faculty of Engineering  第四類建築学課程

Association Memberships

• 日本建築学会   日本計算工学会   日本機械学会   

Published Papers

• CONLIN法を用いた部分的複層ラチスシェルと単層ラチスシェルの位相最適化

  Ryo FUKUDA; Shinya MATSUMOTO; Masakazu TERAI; Daiji FUJII

  AIJ Journal of Technology and Design Architectural Institute of Japan 30 (74) 100 - 105 1341-9463 2024/02 [Refereed]
  
• 力法を用いた剛性最大化と部材長一様化を目的とした単層ラチスシェルの形状最適化

  Renya ISHIMOTO; Masakazu TERAI; Tadashi SAITO; Daiji FUJII

  AIJ Journal of Technology and Design Architectural Institute of Japan 30 (74) 88 - 93 1341-9463 2024/02 [Refereed]
  
• Computational morphogenesis of compliant mechanism using HMPS method and CA-IESO method

  Yutaka SAMESHIMA; Matoshi MANABE; Daiji FUJII

  Journal of Structural and Construction Engineering (Transaction of AIJ) 88 (808) 938 - 944 2023/06 [Refereed]
  
• STUDY ON COMPUTATIONAL MORPHOGENESIS OF UNREINFORCED CONCRETE SHELL USING IESO METHOD Part 1 Review of sensitivity number and morphogenesis of shell with rectangular boundary

  Yutaka Sameshima; Masakazu TERAI; Tadashi SAITO; Daiji FUJII

  Journal of Structural Engineering Architectural Institute of Japan 68B 127 - 134 0910-8033 2022/04 [Refereed]
  
• TOPOLOGY OPTIMIZATION OF STRUCTURES USING CA-IESO METHOD

  Daiji FUJII; Masaki YAMASHITA; Makiko SHIMIZU

  Journal of Structural and Construction Engineering (Transaction of AIJ) 86 (783) 761 - 771 2021/05 [Refereed]
  
• STUDY ON COMPUTATIONAL MORPHOGENESIS OF PARTIAL MULTI-LAYER LATTICE SHELL USING ESO METHOD

  Yuka MIZUTANI; Shinya MATSUMOTO; Satoko ONO; Daiji FUJII

  Journal of Structural Engineering 67B 183 - 188 2021/04 [Refereed]
  
• TOPOLOGY OPTIMIZATION FOR ELASTIC STRUCTURES WITH FINITE DEFORMATION USING HMPS METHOD AND IESO METHOD

  Daiji FUJII; Masaki YAMASHITA; Masatoshi MANABE

  Journal of Structural and Construction Engineering (Transaction of AIJ) 84 (764) 1337 - 1344 2019/10 [Refereed]
  
• Computational morphogenesis of continuum shell structures using ieso method

  Koichi Kamimura; Masatoshi Manabe; Shinya Matsumoto; Daiji Fujii

  Journal of Structural and Construction Engineering (Transaction of AIJ) Architectural Institute of Japan 83 (745) 459 - 465 1881-8153 2018/03 [Refereed]
   

  In this paper, a simple method to find an optimal shell structure is proposed. In this method, a rectangular fixed design domain with given boundary conditions and body forces is modeled by voxel mesh, and strain energies of elements (voxels) are obtained by voxel finite element method. Next, elements with small strain energy are gradually removed by the Improved Evolutionary Structural Optimization (IESO) method. Finally, we can obtain a shell structure that shape, thickness and topology are optimized. In this paper, several numerical examples will be shown in order to verify the effectiveness of the proposed method.
• Optimization of placement of response control damper on plane of high-rise building structure using ESO method

  Masataka Nomura; Shinya Matsumoto; Yoshihiro Sakino; Daiji Fujii

  Journal of Structural and Construction Engineering (Transaction of AIJ) Architectural Institute of Japan 82 (742) 1885 - 1891 1881-8153 2017/12 [Refereed]
   

  Recently, response control dampers are used to improve seismic response of high-rise building. In general, it is required to arrange the dampers efficiently on the plane of high-rise building structure. However, it is not easy to obtain the optimal placement of the dampers, because the damper’s performance depends on the dynamic behavior. Therefore, in this paper, a method to obtain an optimal placement of the response control dampers on the plane of high-rise building structure is proposed. In the present method, first, the dampers are placed on all possible places in the frame structure, and then the dampers are gradually removed by Evolutionary Structural Optimization (ESO) method. The accumulated damping energy of the damper is used to determine the removal order. The effectiveness of the present method is verified by comparison with general placement plans.
• Computational morphogenesis of building structures using IESO method: Application to façade design

  Mizuki Maruyama; Shinya Matsumoto; Daiji Fujii

  Journal of Structural and Construction Engineering (Transaction of AIJ) Architectural Institute of Japan 82 (739) 1383 - 1389 1881-8153 2017/09 [Refereed]
   

  In this paper, we focus on façade design of buildings used prefabricated walls, and we propose a method to design the prefabricated wall using topology optimization method. In this method, artificial design elements are added to the topology optimization method. In this paper, 2-axis symmetry and continuous pattern are adopted as the artificial design elements. Improved ESO (ESO) method is used for the topology optimization method. ESO method is improvement of initial ESO method, and in this method, benefits of BESO, Extended ESO, and CA-ESO methods are combined. In this paper, several numerical examples of computational morphogenesis of prefabricated walls are shown in order to verify the application possibility of the proposed method to the façade design of buildings used prefabricated walls.
• Computational morphogenesis of building structures using ieso method: Natural shape of buildings which resist vertical and seismic load

  Yohei Niiuchi; Shinya Matsumoto; Daiji Fujii

  Journal of Structural and Construction Engineering (Transaction of AIJ) Architectural Institute of Japan 82 (731) 97 - 103 1881-8153 2017/01 [Refereed]
   

  Biomimetic technology (biomimetics) has recently attracted a great deal of attention in engineering field. Also, in architecture field, as represented by shell structure, biomimetics has been used for a long time. In recent years, the buildings which floors are supported by the structure such as trees or seaweeds have been built (Tod's Omotesando Building, Sendai Mediatheque). On the other hand, it is conceivable that the topology optimization can be used for biomimetics in architecture field, because it has been observed that the shape obtained by the topology optimization is relatively close to the natural form. Therefore, in this paper, several numerical examples of computational morphogenesis of building structures using IESO (Improved Evolutionary Structural Optimization) method3) are shown in order to verify the application possibility of the proposed method to the biomimetics. In IESO method, the design domain is divided in same eight-node brick elements (voxels), and in the optimization process, for solid element, it will be removed if the sensitivity number10) is less than the threshold value. This threshold value is obtained from the equation proposed in extended ESO12,13). This equation consists of the mean value of sensitivity number and the average deviation of sensitivity number with a control parameter. In the proposed method, the evolutionary volume ratio (reduction ratio) is given as an input data, and this control parameter is determined automatically in the program so as to satisfy the given reduction ratio approximately. Furthermore, in this paper, finishing algorithm is added to IESO. In this algorithm, first, the converged solution obtained by IESO is input, and then, the elements about 5% of the total elements of design domain are added according to the rule of CA method. Specifically, in order from the element which the sensitivity number is the greatest, the elements of the von Neumann neighborhood are added, and if the number of additional elements is greater than 5% of the total elements of design domain, this program is ended. Finally, the calculation of IESO is executed again with the smaller reduction ratio than the initial analysis (about 1/5∼1/10). Several numerical examples have been shown in order to demonstrate the effectiveness of the proposed method, and the effectiveness for the application to the biomimetics. By the numerical example which is used for design competition for a new train station for Florence (Fig.3), it is shown that natural and simple topology can be obtained by IESO (Fig.4), and it is also shown that if the finishing algorithm is added to IESO, the compliance of the solution obtained by IESO is less than CA-ESO (Fig.5∼8). (It was shown in the previous paper3) that the compliance of the solution obtained by SIMP is greater than CA-ESO.) In the next numerical examples, the structural morphologies which support the single or multi flat slab from various base support points is generated using IESO (Fig.9∼18). From these examples, it is shown that the structural morphologies like natural trees can be generated by IESO. It is concluded from these examples that IESO is one method which can be used for applying biomimetics to the building design.
• Topology optimization of 3D structures using improved ESO method

  Yohei Niiuchi; Shinya Matsumoto; Daiji Fujii

  Journal of Structural and Construction Engineering (Transaction of AIJ) Architectural Institute of Japan 81 (723) 851 - 858 1881-8153 2016/05 [Refereed]
   

  In this paper, an improved ESO (Evolutionary Structural Optimization) method for the topology optimization of 3D structures is proposed. In the proposed method, the idea of BESO method and the idea of extended ESO method are combined. In this method, the design domain is divided in same eight-node brick elements (voxels), and in the optimization process, for solid element, it will be removed if the strain energy is less than the threshold value. This threshold value is obtained from the equation proposed in extended ESO. This equation consists of the mean value of sensitivity number and the average deviation of sensitivity number with a control parameter. In the proposed method, the evolutionary volume ratio (reduction ratio) is given as input data, and this control parameter is determined automatically in the program so as to satisfy the given reduction ratio approximately. Several numerical examples are shown in order to demonstrate the effectiveness of the proposed method for 3D structures.
• Topology optimization of frame structures using ESO method and ground structure method

  Kenji Kosaka; Shinya Matsumoto; Daiji Fujii

  Journal of Structural and Construction Engineering (Transaction of AIJ) Architectural Institute of Japan 81 (721) 547 - 553 1881-8153 2016/03 [Refereed]
   

  In this paper, a simple method for topology optimization of frame structures is proposed. In this method. ESO (Evolutionary Structural Optimization) method is applied to ground structure method. An exact optimal solution may not be obtained by ESO method because it is a heuristic method. However, the approximate solution useful for structural design can be obtained by this method. In the proposed method, the ground structure is generated by connecting all nodes by beam elements (but it is possible to limit the maximum length of the elements, and it is also possible to remove the unnecessary elements), and in the optimization process, the elements with the lowest strain energy are deleted based 011 ESO method. In order to demonstrate the effectiveness of the proposed method, in several numerical examples, the solutions obtained by the proposed method in compared with the solutions obtained by the density approach method (mathematical programming).
• Topology optimization of 3D structures using CA-ESO method and voxel finite element method

  Daiji Fujii; Ryo Okabe; Masatoshi Manabe

  Journal of Structural and Construction Engineering (Transaction of AIJ) Architectural Institute of Japan 79 (703) 1279 - 1286 1881-8153 2014/09 [Refereed]
   

  Recently, topology optimization of three dimensional (3D) structures is paid attention again by the development of manufacturing technology using 3D printer. Therefore, in this paper, an efficient topology optimization method for 3D structures is proposed. In the proposed method, CA-ESO method is used for the topology optimization and the voxel finite element method is used for the stress analysis of 3D structures. In this method, the design domain is divided in same rectangular parallelepiped elements (voxels), and in the optimization process, elements with low stress are deleted by ESO (Evolutionary Structural Optimization) method, and peripheral elements of the element with high stress are generated by CA (Cellular Automaton) method. Also, in the voxel finite element method, the stress assumed element, CG solver, and element by element method are used. Several numerical examples are shown in order to demonstrate the effectiveness of the present method for 3D structures.
• Topology optimization of structures using CA-ESO method

  Daiji Fujii; Masatoshi Manabe

  Journal of Structural and Construction Engineering (Transaction of AIJ) 78 (691) 1569 - 1574 1340-4202 2013/09 [Refereed]
   

  Recently, many heuristic methods for topology optimization of structures have been proposed. However, the heuristic method has not been adopted by general-purpose software, because there are several problems in the computational efficiency and the reliability of the solutions. In this paper, a new heuristic method using cellular automaton (CA) and evolutionary structural optimization (ESO) is proposed for implementing to general-purpose software. In this method, the design domain is divided in same FEM elements (cells), and in the optimization process, the elements are deleted by extended ESO method, and the elements are generated by CA method. The performance of the present method is clarified by comparing with SIMP (Solid Isotropic Material with Penalization) method under the same FEM model and the same conditions. Several numerical examples are shown in order to demonstrate the computational efficiency and the reliability of the present method.
• Shape optimization of frame structures using traction method

  Daiji Fujii; Jin Kakita

  Journal of Structural and Construction Engineering (Transaction of AIJ) 77 (682) 1881 - 1886 1340-4202 2012/12 [Refereed]
   

  In this paper, the traction method is applied to shape optimization of frame structures. The traction method was proposed by Azegami, but in the present method, the sensitivity analysis is different from Azegami's one. The compliance of structure is chosen for objective function, and the coordinates of all nodes of beam elements are chosen for design variables. The method of sensitivity analysis is similar to a method used in topology optimization, but in this case the sensitivity of coordinate transformation matrix and length of elements is necessary. The effectiveness of the present method is verified by comparing with methods using SLP or CONLIN. Several numerical examples of 2-D frame structures are shown to demonstrate the effectiveness of the present method.
• A study on structure checks examination technology - Effective working by outline examination and detailed examination

  Takuya Kitamoto; Daiji Fujii

  AIJ Journal of Technology and Design 16 (34) 877 - 882 1341-9463 2010/10 [Refereed]
   

  The revised building standard law established in 2007 confused building confirmation application process in building work places. This cause of the confusion is related to the strict examination duty ruled by the revised law. In this paper, the contents of the strict examination were analyzed, the work rate was measured, and the working time was measured. Furthermore two techniques to make the examination process more efficient were proposed. One is an effective technique in strict examination, and another is an outline examination. In the outline examination the work rate is small, however a building confirmation application can't be judged exactly. In contrast, in strict examination work rate is heavy, however a building confirmation application can be judged more exactly. Both examination methods have different concept, however using both methods in coordination can make the examination process more effectively. In the previous paper, the strict examination process was shown, and in this paper outline one is mainly discussed.
• Development of a simple system of seismic diagnosis using potable wireless accelerometer and impact force - Evaluation in experiment wooden house

  Shinya Matsumoto; Eiji Motokawa; Daiji Fujii; Kazuhiko Ohta; Suenori Arinaga; Takaaki Ohkubo

  AIJ Journal of Technology and Design 日本建築学会 16 (34) 1187 - 1192 1341-9463 2010/10 [Refereed]
   

  In this study, a simple system of seismic diagnosis is developed. In this system, potable accelerometer and impact force are used. The potable accelerometer was developed by Matsuura and Ohkubo. It is possible to measure vibration easily, because it dose not need wiring and it is compact. The impact force is used to vibrate wooden house. It can be given by human power, but in this study a vibration exciter is made in order to evaluate the present system precisely. The proposed system is evaluated by measuring the natural period and the damping factor of the experiment wooden house in Kinki University.
• Computational morphogenesis of building structure using ground structure approach

  Daiji Fujii; Masatoshi Manabe; Toyofumi Takada

  Journal of Structural and Construction Engineering (Transaction of AIJ) 日本建築学会 73 (633) 1967 - 1973 1340-4202 2008/11 [Refereed]
   

  In this paper, a ground structure approach for computational morphogenesis of building structure is shown. In this method, it is difficult to obtain exact solutions by general non-linear programming methods when the members of ground structure increase. In this paper, some examples that the solution dose not converge to exact solution are shown, and a method for solving this problem is proposed. In the proposed method, SLP or CONLIN method is used as solver of the optimization problem. Several numerical examples are presented to demonstrate the effectiveness of the proposed method. Also, it is shown that this method can be used for computational morphogenesis of building structure.
• A study on structure checks examination technology - A systematization and verification in the rigid examination

  Takuya Kitamoto; Daiji Fujii

  AIJ Journal of Technology and Design 日本建築学会 14 (28) 471 - 476 1341-9463 2008/10 [Refereed]
   

  This study relates to examination technology of a structure check. Since a structure check camouflage case in 2005, a building administration system was argued, and the building-code was amended. In this paper, examination technology was systematized and developed. This examination technology with check lists and calculation tools realizes detection of a camouflaged structure check. And it corresponds to rigid examination by Japanese amended building-code.
• CREATION OF DAMPING MECHANISMS USING TOPOLOGY OPTIMIZATION METHOD OF CONTINUUM

  Daiji FUJII; Tsuyoshi TANIZAWA

  Journal of Structural and Construction Engineering (Transaction of AIJ) Architectural Institute of Japan 72 (619) 73 - 79 1340-4202 2007/09 [Refereed]
   

  In this paper, a topology optimization method to create damping mechanism of a building is shown. The topology is created on continuum divided in finite elements. In the optimization problem, the densities of the elements are chosen as design variables. The stiffness between the input point and the output point is maximized under the constraints of the displacement of the output point, the relativity displacement of the output point and input point, and the material usage. The optimization problem with different initial design variables is solved using the SLP optimizer, because the solution of this problem depends on the initial design variables. The initial design variables are given by random numbers. Some examples are shown to demonstrate the effectiveness of the present method.
• SHAPE OPTIMIZATION FOR SHELL STRUCTURES USING IDEA OF TRACTION METHOD

  Noi HIROMI; Daiji FUJII

  Journal of Structural and Construction Engineering (Transaction of AIJ) Architectural Institute of Japan 72 (616) 121 - 126 1340-4202 2007/06 [Refereed]
   

  In this paper, a shape optimization method for shell structures is shown. The present method is based on the traction method proposed by Azegami. However, the algorithm of the present method is very simple in comparison with the original method. The sensitivity analysis is not need in the present method. The method is similar to large displacement analysis based on update Lagrange, and it is named "deformation method" in this paper. The reliability of the present methods is shown by comparing with the original traction method and other shape optimization methods. Several examples are shown to demonstrate the effectiveness of the present methods for shell structures.
• DEVELOPMENT OF TOPOLOGY ANALYSIS TOOL FOR REINFORCEMENT OF FLOOR SLAB USING CFRP

  Daiji FUJII; Kyoichi NAKAGAWA; Tsuyoshi MORIMURA

  AIJ Journal of Technology and Design 日本建築学会 (24) 95 - 100 1341-9463 2006/12 [Refereed]
  
• CREATION OF LINK MECHANISMS USING TOPOLOGY OPTIMIZATION METHOD OF FRAME

  Daiji FUJII; Takuya HARADA; Yuichi HIRATA

  Journal of Structural and Construction Engineering (Transaction of AIJ) Architectural Institute of Japan 70 (597) 63 - 68 1340-4202 2005/11 [Refereed]
   

  In this paper, the topology optimization method of link mechanisms is shown. In the link mechanisms composed of rigid bodies and hinges, the displacement of the output point can be controlled by the load of the input point. In the present method, the ground structure composed of beams is used in order to obtain the optimum topology of the link mechanisms. In the optimization problem, the sectional areas of the beams are chosen as design variables. The stiffness between the input point and the output point is maximized under the constraints of the displacement of the output point, the relativity displacement of the output point and input point, and the material usage. The optimization problem with different initial design variables are solved using the SLP optimizer, because the solution of this problem depends on the initial design variables. The initial design variables are given by random numbers or GA. Some examples are shown to demonstrate the effectiveness of the present method.
• OPTIMUM REINFORCEMENT OF VOID SLAB BY CFRP USING TOPOLOGY OPTIMIZATION METHOD

  Daiji FUJII; Tomohiko KOIZUMI; Tsuyoshi MORIMURA

  Journal of Structural and Construction Engineering (Transaction of AIJ) Architectural Institute of Japan 69 (585) 109 - 114 1340-4202 2004/11 [Refereed]
   

  Since the possibility of Tokai or Nankai earthquakes, the reinforcement of the buildings is very important. The method using the CFRP tape is effective for the reinforcement of the floor slab. However, since it is relatively expensive, it is necessary to efficiently affix for the CFRP tape. Therefore, in this paper, the topology optimization method (density approach) is used in order to obtain the optimum layout of the CFRP tape. For this purpose, the FEM program for analyzing the laminate plate is developed, and the density approach with CONLIN optimizer is applied. In this program, the solid element based on the hybrid method is used instead of the conventional plate element. In this study, the void slab is used for the floor structure. The effectiveness of the proposed method is shown by the numerical examples and the comparison with the experiment.
• An Elastic and Elasto-Plastic Mixed Analysis Using Overlaying Mesh Method

  Shogo NAKASUMI; Katsuyuki SUZUKI; Daiji FUJII; Hideomi OHTSUBO

  Transactions of the JSME (in Japanese) The Japan Society of Mechanical Engineers 68 (668) 603 - 610 0387-5008 2002/04 [Refereed]
   

  In this paper, the effective method for an elasto-plastic analysis is presented. In the overlaying mesh method, a local model is overlaid on a global model, the former represents high resolution of deformation and the latter represents rough deformation. However, when material-mixed model is analyzed using this method, the elastic constant must be the same at identical part between global model and local model. This makes modeling very inconvenient. In this paper, we clarify the behavior in the case of different elastic constant is used between global model and local model. In this case, the elastic constant of global model is ignored, and that of local model is adapted. By this theory, mesh of global model and that of local model can be made independently not only in geometric shape but also in material constant. And furthermore, this theory is applied to an elastoplastic analysis. In this method, global model is analyzed by liner analysis, and local model by nonliner analysis. We can reduce calculation cost by using this method.
• Topology Optimization of Continuum Using Nodeless Hybrid Element

  Daiji FUJII; Mitsunari KITAYAMA; Katsuyuki SUZUKI; Hideomi OHTSUBO; Etsuo KAZAMA; Tadahiko KAWAI

  Transactions of the JSME (in Japanese) The Japan Society of Mechanical Engineers 68 (667) 399 - 406 0387-5008 2002/03 [Refereed]
   

  In the topology optimization analysis of continuum, the checkerboards, that is the fomation of regions of alternating solid and void elements ordered in a checkerboard-like fashion, often appear in the optimum solutions. In this paper, a nodeless hybrid element is proposed and this element is applied to the topology optimization analysis of continuum in order to solve the checkerboards problem. The proposed hybrid element is fomulated based on the idea of nodeless element proposed by Kawai et al. and the stress assumed element proposed by Sekiguchi and Kikuchi. The homogenization design method is used for the topology optimization analysis of continuum. Some examples of two-dimensional problems are shown to demonstrate the effectiveness of the proposed element in the topology optimization analysis of continuum.
• Topology Optimization of Elastic Link Mechanisms (Topology Optimization of Frame Structures with Displacement Constraint)

  Daiji FUJII; Katsuyuki SUZUKI; Hideomi OHTSUBO; Masai ISHIKAWA

  Transactions of the JSME (in Japanese) The Japan Society of Mechanical Engineers 67 (664) 3730 - 3737 0387-5024 2001/12 [Refereed]
   

  In this paper, a topology optimization method of elastic link mechanisms is shown. In these mechanisms, the displacement of the output point can be controlled by the load of the input point. The mechanism obtained by the present method is composed of the frame structure with elastic members and semi-rigid connections. The ground structure approach is used in order to obtain the optimum topology of the mechanism. In the optimization problem, both of the sectional area of the members and the rigidity of the connections are chosen as design variables. The stiffness between the input point and the output point is maximized under the total weight constraint and the displacement constraint of the output point. The optimization problem is solved using the SLP optimizer. Several examples are shown to demonstrate the effectiveness of the present method.
• Divelopment of Topology Optimization Based on the Frame Based Unit Cell (2nd Report, Maximizing Stiffness of the Structure Subjected to Eigenvalues and Volume)

  Keizo ISHII; Shigeru AOMURA; Daiji FUJII

  Transactions of the JSME (in Japanese) 67 (664) 499 - 506 2001/12 [Refereed]
  
• Mixed analysis of shell and solid elements using overlaying mesh method (Part2)

  Shogo Nakasumi; Katsuyuki Suzuki; Daiji Fujii; Hideomi Ohtsubo

  Journal of the Society of Naval Architects of Japan The Japan Society of Naval Architects and Ocean Engineers (190) 655 - 662 0514-8499 2001/11 [Refereed]
   

  In the structural design of ship hull, the shell element is used for the analysis of the global model. However, the analysis using the solid elements is necessary for the analysis of the stress concentration zone or the crack vicinity. Therefore, we proposed the mixed method for assembling the shell elements and the solid elements using the overlay method. In this paper, the effectiveness of the presented method for the bending problem is investigated. In the bending analysis for the shell-shell assembling using the presented method, it was proven that a numerical instability occurs. In this paper, it is shown that such numerical instability occurs in the shell-solid assembling, and the solution about this problem is presented. In addition, a problem in which the bending deformation is generated in the effect of local model is shown. The numerical instability in such problem is also investigated, and its solution is presented. Some simple examples are shown to demonstrate the present solutions.
• Discrete Plate Bending Analysis Using Finite Cover Method

  Katsuyuki Suzuki; Daiji Fujii; Hideomi Ohtsubo; Hirotoshi Yoshida

  Journal of the Society of Naval Architects of Japan The Japan Society of Naval Architects and Ocean Engineers (190) 649 - 654 0514-8499 2001/11 [Refereed]
   

  In this paper, the Finite Cover Method, which is unified analysis method of discrete model and continuum model, is extended for the plate-bending problem for the analysis of progressive failure of sea level ice. The solid element with assumed stress is employed to avoid the shear locking in Mindlin plate, and good accuracy is obtained for the case of large aspect ratio. The method to introduce discrete plane in Finite Cover Method to model the failure of ice is shown, and penalty spring is introduced to analyze the progressive failure of ice. One-dimensional examples and two-dimensional examples are solved to show the capability of the method.
• TOPOLOGY OPTIMIZATION OF FRAME STRUCTURES USING CONLIN OPTIMIZSE

  Daiji FUJII; Katsuyuki SUZUKI; Hideomi OHTSUBO

  Journal of Structural and Construction Engineering (Transaction of AIJ) Architectural Institute of Japan 66 (548) 59 - 66 1340-4202 2001/10 [Refereed]
   

  The Convex Linearization method (CONLIN), that is a dual optimizer based on the convex approximation concepts, is often used to solve the structural optimization problem, recently. The CONLIN optimizer has many benefits, for example, the handling of constraint conditions is easy as well as the SLP method, and the performance of convergence is excellent as well as the optimality criteria method (OC). In this paper, the CONLIN optimizer is applied to the topology optimization problem of frame structures in order to investigate the performance of this optimizer in the topology optimization analysis. The ground structure method is used to obtain the optimum topology of frame structures. The characteristics of the CONLIN optimizer are clarified by comparing with the SLP method and OC method. Several examples are shown to demonstrate the effectiveness of the CONLIN optimizer for the topology optimization analysis.
• DIVELOPMENT OF SHAPE AND TOPOLOGY OPTIMIZATION TOOLS FOR ARCHITECTURE DESGN EDUCATION

  Daiji FUJII; Katsuyuki SUZUKI; Hideomi OHTSUBO

  AIJ Journal of Technology and Design 日本建築学会 (13) 69 - 74 2001/07 [Refereed]
  
• Mixed analysis of shell and solid elements using overlaying mesh method

  Shogo Nakasumi; Katsuyuki Suzuki; Hideomi Ohtsubo; Daiji Fujii

  Journal of the Society of Naval Architects of Japan The Japan Society of Naval Architects and Ocean Engineers (189) 219 - 224 0514-8499 2001/06 [Refereed]
   

  In the structural design of ship hull, the shell element is used for the analysis of the global model. However, the analysis using the solid elements is necessary for the analysis of the stress concentration zone or the crack vicinity. Therefore, we proposed the mixed method for assembling the shell elements and the solid elements using the overlay method. In this paper, the effectiveness of the presented method for the bending problem is investigated. In the bending analysis for the shell-shell assembling using the presented method, it was proven that a numerical instability occurs. In this paper, it is shown that such numerical instability occurs in the shell-solid assembling, and the solution about this problem is presented. In addition, a problem in which the bending deformation is generated in the effect of local model is shown. The numerical instability in such problem is also investigated, and its solution is presented. Some simple examples are shown to demonstrate the present solutions.
• A study on the analysis of the plate model with a hole by overlaying mesh method

  Shogo NAKASUMI; Katsuyuki SUZUKI; Daiji FUJII; Hideomi OHTSUBO

  Transaction of JSCES 3 145 - 150 2001/05 [Refereed]
  
• Wave propagation analysis of ultrasound using the voxel finite element method and PML absorbing boundary

  Daiji FUJII; Norihito UETSUKI; Katsuyuki SUZUKI; Hideomi OHTSUBO

  Transaction of JSCES 日本計算工学会 2001 (3) 137 - 144 2001/05 [Refereed]
  
• FILTERING METHOD FOR TOPOLOGY OPTIMIZATION ANALYSIS USING OPTIMALITY CRITERIA METHOD

  Daiji FUJII; Katsuyuki FUJII; Hideomi OHTSUBO

  Journal of Structural and Construction Engineering (Transaction of AIJ) Architectural Institute of Japan 66 (543) 105 - 112 1340-4202 2001/05 [Refereed]
   

  In the topology optimization analysis based on the homogenization design method or the density approach, the checkerboards, that is the formation of regions of altemating solid and void elements ordered in a checkerboard-like fashion, often appear in the optimum solutions. Therefore, the filtering method is necessary for these approaches. In this paper, we present an effective filteing method for the topology optimization analysis using the optimality criteria method as optimizer. In this method, the value of the gravity control function is controlled as a constrained condition. The gravity control function, which was presented by the author in the topology optimization analysis using the S LP method , is defined from the relations of the density of an element with that of its neighbor elements. This function imposes the penalty in the checkerboards and the gray scale density, that is, if the fuction is high, the checkerboards and gray scales disappear in the optimum solution. In this paper, this filtering method is applied in the topology optimization using the homogenization design method and the density approach. Several examples of 2D and 3D problems are shown to demonstrated the effectiveness of the present method.
• Composite material design of two-dimensional structures using the homogenization design method

  D Fujii; BC Chen; N Kikuchi

  INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING JOHN WILEY & SONS LTD 50 (9) 2031 - 2051 0029-5981 2001/03 [Refereed]
   

  Composite materials of two-dimensional structures are designed using the homogenization design method. The composite material is made of two or three different material phases. Designing the composite material consists of finding a distribution of material phases that minimizes the mean compliance of the macrostructure subject to volume fraction constraints of the constituent phases, within a unit cell of periodic microstructures. At the start of the computational solution, the material distribution of the microstructure is represented as a pure mixture of the constituent phases. As the iteration procedure unfolds, the component phases separate themselves out to form distinctive interfaces. The effective material properties of the artificially mixed materials are defined by the interpolation of the constituents. The optimization problem is solved using the sequential linear programming method. Both the macrostructure and the microstructures are analysed using the finite element method in each iteration step. Several examples of optimal topology design of composite material are presented to demonstrate the validity of the present numerical algorithm. Copyright (C) 2001 John Wiley & Sons, Ltd.
• TOPOLOGY OPTIMIZATION OF COMPOSITE MATERIAL USING THE HOMOGENIZATION DESIGN METHOD

  Daiji FUJII; Noboru KIKUCHI

  Journal of Structural and Construction Engineering (Transaction of AIJ) Architectural Institute of Japan 65 (535) 79 - 94 1340-4202 2000/09 [Refereed]
   

  In this paper, we present an effective method for designing the composite material by the topology optimization technique using the homogenization design method. The composite material is made of two or three different material phases. Designing the composite material consists of finding a distribution of material chases that minimizes the mean compliance of the macrostructure subject to volume fraction constraints of the constituent phases, within a unit cell of periodic microstructures. At the start of the computational solution, the material distribution of the microstracture is represented as a pure mixture of the constituent phases As the iteration procedure unfolds, the component phases separate themselves out to form distinctive interfaces. The optimization problem is solved using the SLP method. Several examples of optimal topology design of composite material are presented to demonstrate the validity of the present numerical algorithm.
• Topology optimization of structures using the voxel finite element method

  Daiji FUJII; Katsuyuki SUZUKI; Hideomi OHTSUBO

  Transaction of JSCES 2 87 - 94 2000/05 [Refereed]
  
• Improvement of numerical instabilities in topology optimization using the SLP method

  D Fujii; N Kikuchi

  STRUCTURAL AND MULTIDISCIPLINARY OPTIMIZATION SPRINGER VERLAG 19 (2) 113 - 121 1615-147X 2000/04 [Refereed]
   

  In this paper, we present a method for preventing numerical instabilities such as checkerboards, mesh-dependencies and local minima occurring in the topology optimization which is formulated by the homogenization design method and in which the SLP method is used as optimizer. In the present method, a function based on the concept of gravity (which we named "the gravity control function") is added to the objective function. The density distribution of the topology is concentrated by maximizing this function, and as a result, checkerboards and intermediate densities are eliminated. Some techniques are introduced in the optimization procedure for preventing the local minima. The validity of the present method is demonstrated by numerical examples of both the short cantilever beam and the MBB beam.
• Topology optimization of frame structure using the ground structure approach

  Daiji FUJII; Shinya MATSUMOTO; Yoshinobu FUJITANI; Noboru KIKUCHI

  Journal of Structural Engineering 46B 1 - 8 2000/03 [Refereed]
  
• TOPOLOGY OPTIMIZATION OF COMPLIANT MECHANISMS USING THE HOMOGENIZATION DESIGN METHOD

  Daiji FUJII; Susumu EJIMA; Noboru KIKUCHI

  Journal of Structural and Construction Engineering (Transaction of AIJ) Architectural Institute of Japan 65 (528) 99 - 105 1340-4202 2000/02 [Refereed]
   

  In this paper, we present an effective method for designing the compliant mechanisms by the topology optimization technique using the homogenization design method. In this method, a new multi-objective function which maximizes the relative compliance between input at the loading point and output at a prescribed point is defined. The topology optimization problem formulated using the homogenization design method is solved by SLP method. In this algorithm, with the size of the hole of unit cell, the angle of unit cell is made to be a design variable. The local minima occurring in topology optimization in which SLP method is used and the gray scale densities of optimal solutions are improved by .our presented methods. The effectiveness of the present method is demonstrated by numerical examples of the topology optimization on a short cantilever plate.
• MINIMUM COST ANALYSIS OF SEMI-RIGIDLY CONNECTED STEEL FRAMES CONSIDERING COST OF JOINTS

  Shinya MATSUMOTO; Yasuhiro KASUGA; Daiji FUJII; Yoshinobu FUJITANI

  Journal of Structural and Construction Engineering (Transaction of AIJ) Architectural Institute of Japan 65 (528) 113 - 120 1340-4202 2000/02 [Refereed]
   

  In this paper, an analysis method by computers based on optimum design of frames with semi-rigid connection is shown. This method evaluates the connection stiffness and the member sizes as design variables. The discrete member sizes are evaluated by referring to the database system as continuous function. The optimization algorithm minimizes the cost of not only members but also the connections of the structure subjected to constraints on stresses and displacements under specified design loads. Four examples are presented to illustrate features of this optimization method.
• IMPROVEMENT OF NUMERICAL INSTABILITIES IN THE TOPOLOGY OPTIMIZATION USING SLP METHOD

  Daiji FUJII; Noboru KIKUCHI

  Journal of Structural and Construction Engineering (Transaction of AIJ) 64 (521) 65 - 72 1999/07 [Refereed]
  
• An Example of Local Solutions in Minimum Weight Design of Steel Frames

  Shinya MATSUMOTO; Hiroshi ARAI; Yasuhiko KASUGA; Yuichi HIRATA; Kenji YAMAMOTO; Daiji FUJII; Yoshinobu FUJITANI

  Journal of Structural Engineering Architectural Institute of Japan 45B 249 - 258 0910-8033 1999/03 [Refereed]
   

  In this paper, the method of the optimal design for plane steel frame structures is presented. The sectional areas are automatically selected so as to be a minimum weight frame under the restraint conditions of the limited angle between the layers and the allowable stress in the composed members. In the present method, the sensitivity coefficients are numerically calculated by the finite difference method and the actual members on the market are selected by using the error functions between the obtained numerical solution and the discrete actual sectional properties of members. The interesting optimal solutions, which have the three local solutions, are obtained in an example of the plane steel frame with 5 floors and 3 spans.
• STUDY ON DESIGN OPTIMIZATION OF A HIGHRISE BUILDING USING THIN-WALLED BEAM ANALYSIS

  Daiji FUJII; Yoshinobu FUJITANI

  Journal of Structural and Construction Engineering (Transaction of AIJ) 63 (510) 99 - 106 1998/08 [Refereed]
  
• DEVELOPMENT OF A COMPUTER PROGRAM FOR THE OPTIMAL DESIGN OF REINFORCED CONCRETE BUILDINGS

  Yoshinobu FUJITANI; Daiji FUJII; Yasuhiro KASUGA; Atsuyoshi ONAKA; Yuichi HIRATA; Hiroshi ARAI; Yoichi SHIOZAKI; Kenji YAMAMOTO

  AIJ Journal of Technology and Design Architectural Institute of Japan 3 (5) 63 - 68 1341-9463 1997/12 [Refereed]
   

  A computer program which is developed for the optimal design of reinforced concrete buildings is presented. By using this program, it is possible to design of the sections of RC frame members under constraint conditions of new seismic design in Japan. Fairly good results are obtained through calculation example which is referred from the Japanese standard for structural calculation of RC structure.
• A METHOD OF NON-LINEAR VIBRATION ANALYSIS FOR STRUCTURES CONTAINING FRICTION AND CONTACT ELEMENTS Part2: Base isolation, non-stationary friction coefficients, locus on sliding surface

  Toshihiro YAMAMOTO; Yoshinobu FUJITANI; Daiji FUJII

  Journal of Structural and Construction Engineering (Transaction of AIJ) Architectural Institute of Japan 62 (493) 41 - 48 1340-4202 1997/03 [Refereed]
   

  In this paper, we investigate three characteristics of seismic response in the friction systems. First contents are base isolation systems containing mass on the base floor. We compare the response of these systems with one in the case of no mass on the base floor. Second contents are friction coefficients depended on the sliding velocity. We explain the method to simulate, and show response waves calculated using four kinds of these characteristics. Third contents are non-directional friction forces on the sliding plane surface. We propose one method to analyze the response of friction systems including those forces. In addition, we show the locus of ground motion and sliding motion using single or two mass model subjected to horizontal bi-axial earthquake.
• Finite element analysis of a thin-walled tapered beam considering shear warping deformation

  Daiji FUJII; Yoshinobu FUJITANI; Hiroshi FUNAKOSHI

  Journal of Structural Engineering 43B 65 - 74 1997/03 [Refereed]
  
• A Finite Element Analysis of Discontinuous Thin-walled Beams Considering Non-uniform Shear Warping Deformation

  Seong-Whan Park; Daiji Fujii; Yoshinobu Fujitani

  COMPUTERS & STRUCTURES 65 (1) 17 - 27 1997 [Refereed]
  
• TORSIONAL ANALYSIS OF THIN-WALLED BEAM WITH DISCONTINUOUSLY VARIABLE CROSS-SECTION BY USING SHEAR WARPING FUNCTION

  Daiji FUJII; Seong-Whan PARK; Yoshinobu FUJITANI

  Journal of Structural and Construction Engineering (Transaction of AIJ) Architectural Institute of Japan 61 (487) 93 - 101 1340-4202 1996/09 [Refereed]
   

  In this paper, two analysis models for the coupled torsional-bending responses of thin-walled beam with discontinuously variable cross-sections are presented. These models are based on a thin-walled beam theory which takes into account shear deformation by the 2D or 3D shear warping function. A C1 continuous finite element with boundary contraction technique is used for the discretization. The compatibility condition of warping, which is automatically satisfied in the 3D shear warping model, is satisfied approximately in the 2D shear warping model by use of warping error minimization technique. By an example of box girder with open section, the accuracy and efficiency of present models are shown.
• FINITE ELEMENT ANALYSIS OF THIN-WALLED BEAM CONSIDERING SHEAR WARPING DEFORMATION Bending-torsional analysis by using nonuniform shear warping function

  Seong-Whan PARK; Daiji FUJII; Yoshinobu FUJITANI

  Journal of Structural and Construction Engineering (Transaction of AIJ) Architectural Institute of Japan 61 (484) 65 - 74 1340-4202 1996/06 [Refereed]
   

  The finite element formulation of nonuniform shear warping model for thin-walled beam's flexural-torsional behavior, which can show the precise distribution of normal stress and shear stress on the beam section including the shear lag phenomena, is developed. In order to realize the acual end conditio of the beam, a boundary contraction method for the additional degress freedom of out-plane warping due to shear is applied. By some examples of the closed and open thin-walled sectin beams, te accuracy and convergency of the numerical solutions are compared with the analytical solutions.
• A METHOD OF NON-LINEAR VIBRATION ANALYSIS FOR STRUCTURES CONTAINING FRICTION AND CONTACT ELEMENTS (Application for multi-degree of freedom system and base isolation)

  Toshihiro YAMAMOTO; Yoshinobu FUJITANI; Daiji FUJII

  Journal of Structural and Construction Engineering (Transaction of AIJ) (483) 71 - 79 1996/05 [Refereed]
  
• A New Non-conforming 4-node Quadrilateral Plate Bending Element

  Daiji FUJII; Yoshinobu FUJITANI; Tatsuya KATAOKA

  Journal of Structural Engineering Architectural Institute of Japan 42B 253 - 260 0910-8033 1996/03 [Refereed]
   

  In this paper, a new non-comforming 4-node quadrilateral plate bending element is developed. This finite element is formulated on the basis of Reissner's plate bending theory. The displacement fields in this theory consist of the two kinds of rotations. One is the differentiation of the deflection, the other is the shear angle of the plate. However, after the discretization procedure in finite element method, these two rotations at each node are unified to the one rotation of the cross section by the contraction method. This contruction is achieved by using the mechanical relations between the bending moment and shear force at each node. Several numerical experiments are performed, and show that the present element gives excellent results in the analysis of both thin and thick plate bending.
• STRUCTURAL OPTIMIZATION ANALYSIS OF HIGHRISE BUILDING BY USING THE THIN-WALLED BEAM THEORY CONSIDERING SHEAR EFFECT Study on structural analysis of a high rise building by the thin-walled beam theory (Part 3)

  Daiji FUJII; Yoshinobu FUJITANI

  Journal of Structural and Construction Engineering (Transaction of AIJ) 477 (477) 57 - 66 1995/11 [Refereed]
  
• A RESEARCH FOR THE THIN-WALLED BEAM THEORY BY USING SHEAR WARPING FUNCTION Bending analysis by using nonuniform shear warping function

  Seong-Whan PARK; Daiji FUJII; Yoshinobu FUJITANI

  Journal of Structural and Construction Engineering (Transaction of AIJ) Architectural Institute of Japan 60 (473) 107 - 116 1340-4202 1995/07 [Refereed]
   

  In this paper, two analysis models, a uniform shear warping model and a nonuniform shear warping model for the thin-walled beam's flexural behavior are developed, which can show the precise distribution of normal stress and shear stress within the beam section including the shear lag phenomena. The mechanism of boundary condition of the developed shear warping models and their relation for the Timoshenko's beam model are discussed and clearly verified. By using the St. Venant's semi-inverse method, the uniform and nonuniform warping functions are defined. By two examples, the usefulness of the proposed analysis model is shown.
• A Development of 2-D. Shear Warping Theory for Thin-walled Beam Structural Analysis

  Seong-Whan PARK; Daiji FUJII; Yoshinobu FUJITANI

  Journal of Structural Engineering 41B 179 - 190 1995/03 [Refereed]
  
• INVESTIGATION FOR THE VALIDITY OF FINITE ELEMENT ANALYSIS BASED ON THE THIN-WALLED BEAM THEORY IN ACTUAL STRUCTURAL DESIGN Study on structural analysis of a highrise building by the thin-walled beam theory (Part 2)

  Daiji FUJII; Yoshinobu FUJITANI

  Journal of Structural and Construction Engineering (Transaction of AIJ) Architectural Institute of Japan 60 (467) 45 - 53 1340-4202 1995/01 [Refereed]
   

  We presented an effective finite element method based on the thin-walled beam theory for the structural analysis of highrise building. However, the story deformation angles and shear forces obtained by this method are not acculate in the lowest story. In this paper, we show the matrix condensation methods based on the Uetani's idea in order to solve this problem. By numerical example of analysis of a highrise building, we show the validity of this methods, and we show it is possible to apply the present method to actual structural design.
• FINITE ELEMENT ANALYSIS OF A THREE DIMENSIONAL HIGH-RISE FRAME STRUCTURES BASED ON THE THIN-WALLED BEAM THEORY Study on structural analysis of a high rise building by the thin-walled beam theory Part 1

  Daiji FUJII; Yoshinobu FUJITANI

  Journal of Structural and Construction Engineering (Transaction of AIJ) 453 (453) 65 - 75 1993/11 [Refereed]
  
• Dynamic Interaction Analysis of the Foundations Embedded in the Multi-Layerd Soil

  Daiji Fujii

  Doctoral thesis (Hiroshima Univ.) 1992/06
• THREE DIMENSIONAL DYNAMIC INTERACTION ANALYSIS OF SOIL AND FOUNDATION WITH A HYBRID METHOD

  Nagayuki YOSHIDA; Daiji FUJII; Yutaka SETO; Yoshinobu FUJITANI

  Journal of Structural and Construction Engineering (Transaction of AIJ) Architectural Institute of Japan (421) 89 - 99 0910-8025 1991/03 [Refereed]
   

  This paper presents the new analytical method for the three-dimensional dynamic interaction problem between a layered soil and embedded foundations with arbitrary shapes. A soil domain is devided into the two subdomains by an artificial cylindrical boundary. A general dispacement field of the outer domain is expanded in a Fourier series and analyzed by the indirect boundary integral equation method which has been developed by authors in a thin layered soil model. The inner domain is discretized by ordinary boundary element method. Combining equations for the total domain are obtained by applying the Fourier inverse technique to the stiffness equations of the outer domain. The method is illustrated by the analysis of a rigid rectangular foundation embedded in an elastic uniform soil. The impedance functions and the foundation input motions are discussed as well as the distribution of soil pressure and the local effects of the side wall.
• FINITE ELEMENT ANALYSIS OF HIGH-ORDER ELASTIC FUNDAMENTAL SOLUTIONS Studies on analysis of elastic fundamental solutions by finite element method, Part 3

  Yoshinobu FUJITANI; Daiji FUJII

  Journal of Structural and Construction Engineering (Transaction of AIJ) Architectural Institute of Japan (419) 99 - 106 0910-8025 1991/01 [Refereed]
   

  This paper presents a procedure for the finite element analysis of high-order elastic fundamental solutions in two-and three-dimensional bodies. Three-dimensional fundamental solutions can be expressed by the Fourier's Series expansion with respect to the Coordinate ψ. Its Second-order solution correspond to the plane symmetric fundamental solution (Cerruti's solution) and is formulated in this paper by finite element method. Two-dimensional higher-order fundamental solutions under following load conditions are analysed by finite element method: (1) a couple, (2) equal and opposite moment of couples, acting on the straight boundary of an infinite plane. It is clarified that the usual two-dimensional fundamental solution can be solved by a simultaneous equation, however, the above higher-order two-dimensional fundamental solutions are analysed as eigen-value problem. By the present finite element method, the numerical fundamental solutions were obtained with good convergence.
• DYNAMIC RESPONSE CHARACTERISTICS OF A RIGID CYLINDRICAL FOUNDATION WITH THE BACKFILLED SOIL

  NAGAYUKI YOSHIDA; DAIJI FUJII; YOSHINOBU FUJITANI

  Journal of Structural and Construction Engineering (Transaction of AIJ) Architectural Institute of Japan (405) 103 - 113 0910-8025 1989/11 [Refereed]
   

  The effect of the backfilled soil on the dynamic response property of the foundation is investigated. For this purpose the new analytical method is also presented. The outer domain of a soil is analyzed by the indirect boundary integral equation method in the thin layered soil model which has been developed by authors. The inner domain which contains an irregular soft soil is discretized using the axi-symmetric isoparametric finite elements. Combining equations for the total domain are obtained by applying the principle of virtual displacements to the stiffness equation of the outer domain. The three types of the foundation are chosen as analytical models. The first is rested on the elastic base through a surface stratum. The second and third are floating in the homogeneous half space soil and the upper layer of the two layered soil respectively. The results obtained by numerical analyses are as follows. 1) The rigidly backfilled soil reduces the maximum response of the superstructure within the natural period of 0.3 or 0.4 second. Conversely the softly backfilled soil is usefull for the structure with the natural period of longer than it. 2) The maximum response of the foundation bonded to the elastic base becomes lower in a soft backfill rather than a rigid one.
• APPLICATION OF BOUNDARY INTEGRAL EQUATION METHOD TO THIN LAYERED VISCO-ELASTIC SOIL MODEL The case of horizontal and rocking oscillations

  DAIJI FUJII; NAGAYUKI YOSHIDA; YOSHINOBU FUJITANI

  Journal of Structural and Construction Engineering (Transaction of AIJ) Architectural Institute of Japan (394) 84 - 93 0910-8025 1988/12 [Refereed]
   

  The boundary integral equation method based on the Green's function obtained by the thin layer method is very useful for the analysis of the foundations embedded in multi-layered visco-elastic soil. However, two problems exist in this method;!) the calculation of the stress components of the Green's functions introduces substantial errors near the applied point, 2) the solution of the dynamic stiffness analysis is disturbed in the vicinity of fictitious eigen-frequencies. The latter problem can be resolved by putting several constraint panels in the internal region. The former problem can be also resolved by modifying the stress matrix under certain conditions. This paper presents new conditions to modify the stress matrix. This conditions are derived from the boundary integral equations which the Green's functions must satisfy in the internal region when a applied point is in the external region. In order to show the validity of the present method, this paper presents the dynamic horizontal and rocking stiffness analysis of the cylindrical foundations embedded in the homogenious visco-elastic soil. Also we calculate the dynamic response of the cylindrical foundations embedded in the two layered visco-elastic soil when subjected to S-wave excitation with vertical incidence, and we qualitatively investigate the effect of the side walls of the foundations on the response of the soil-structure system by considering a model of structure consisting of the embedded foundation and the lamped mass system with single degree of freedam.
• APPLICATION OF BOUNDARY INTEGRAL EQUATION METHOD TO THIN LAYERED VISCO-ELASTIC SOIL MODEL The case of torsional oscillations

  NAGAYUKI YOSHIDA; DAIJI FUJII; YOSHINOBU FUJITANI

  Journal of Structural and Construction Engineering (Transaction of AIJ) Architectural Institute of Japan (383) 98 - 108 0910-8025 1988/01 [Refereed]
   

  The boundary integral equation method involving the Green's function by the thin layer method is very useful for the analysis of the excavated multi-layered visco-elastic soil. However, there exist two complexities in this method ; 1) the calculation of the stress components of the Green's functions introduces substantial errors near the applied point, 2) the solution of the dynamic stiffness analysis is disturbed in wide range near the natural frequency of the internal region. This paper resolves both of these complexities at once by putting several constraint panels in the internal region. Those panels are used for the purpose of taking away the internal resonance point from the frequency range of interest and deriving the conditions to modify the solution of the stress. In order to show the validity of the present method, this paper presents the dynamic torsional stiffness analysis of the axi-symmetric excavation.
• APPLICATION OF BOUNDARY INTEGRAL EQUATION METHOD TO THIN LAYERED SOIL MODEL

  NAGAYUKI YOSHIDA; DAIJI FUJII; YOSHINOBU FUJITANI

  Journal of Structural and Construction Engineering (Transaction of AIJ) Architectural Institute of Japan (372) 93 - 102 0910-8025 1987/02 [Refereed]
   

  The boundary integral equation method involving the Green's function of the multi-layered medium by the thin layer method is very useful to evaluate the foundamental physical quantities in the dynamic soil-foundation interaction problem. However, there exist two complexities in evaluating these quantities by this method ; 1) the calculation of the stress components of the Green's functions introduces substantial errors near the applied point, 2) the solution of the dynamic stiffness analysis is disturbed in wide range near the natural frequency of the fundation (the internal resonance). In spite of the complexity 1), both of the imaginary part of the impedance and static impedance are rather exactly calculated by the indirect integral formulation. So, the real part can be indirectly obtained from them by the Hilbert transform, and also it can be directly calculated by modifying the solutions of the stress from the condition that the internal stress might be real value. The complexity 2) is resolved by putting the internal constraint surface in the foundation to take away the internal resonance point from the frequency range of interest. In order to verify the accuracy of the proposed method, this paper presents the torsional impedance analysis of axi-symmetric foundation by use of the ring-line-load solutions in a thin layered soil.
• DYNAMIC SOIL-FOUNDATION INTERACTION ANALYSIS BASED ON INTERRELATIONS OF FUNDAMENTAL PHISICAL QUANTITIES

  NAGAYUKI YOSHIDA; YOSHINOBU FUJITANI; DAIJI FUJII

  Journal of Structural and Construction Engineering (Transaction of AIJ) Architectural Institute of Japan (367) 103 - 110 0910-8025 1986/09 [Refereed]
   

  There exist three fundamental physical quantities in the dynamic soil-foundation interaction problem. These are the real and imaginary parts of impedance, and the seismic exciting force. An integral equation formulation based on the dynamic Green's functions for an elastic medium is developed for use as a tool in analyzing the fundamental physical quantities. A limited number of the evaluation for them are available at present, most of which are restricted to the case of flat foundations because in case of the embedded foundation the enormous computational time is needed for calculation of the dynamic Green's functions. It is the objective of this work to remove the limitation by applying interrelations of the physical quantities to the boundary integral equation method. The displacement field is represented by the displacement component of the Green's functions and the source distribution at the interface of soil and foundations. Both of the imaginary part of the impedance and the static impedance are directly obtained by the source distribution. The real part of the impedance is indirectly calculated from them by the Hilbert transform. The seismic exciting force is represented as the product of the source distribution and the free-field motion through use of the reciprocal theorem. Therefore, the evaluation of the physical quantities reduces to the problem of determining the intensity of source distribution. The proposed method resolves a prevailing shortcoming in the analysis of the embedded foundation ; the necessity of calculation for the stress components of the dynamic Green's functions.

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Conference Activities & Talks

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  藤井大地

  GBRC2020構造技術セミナー「一歩先の構造設計」特別講演  2020/12
• 位相最適化手法を用いた建築構造の形態創生  [Invited]

  藤井大地

  第15回コロキウム構造形態の解析と創生2020特別講演  2020/11
• 位相最適化手法を用いた構造形態創生に関する一連の研究  [Invited]

  藤井大地

  [公開] 構造委員会 2020年日本建築学会賞 (論文) 受賞者に聞く  2020/09
• 位相最適化手法を用いた構造形態創生に関する一連の研究  [Invited]

  藤井大地

  シェル・空間構造 2020年 日本建築学会論文賞・作品賞 受賞講演会  2020/06
• Topology Optimization of Free Formed Shells using Improved ESO

  Koki Otani; Koichi Kamimura; Shinya Matsumoto; Daiji Fujii

  Proceedings of the IASS Annual Symposium 2019  2019/11
• Topology Optimization of Shell Structures using Improved ESO  [Not invited]

  Koichi Kamimura; Shinya Matsumoto; Daiji Fujii

  The 12th International Symposium on Architectural Interchanges in Asia  2018/10
• Study on Structural Form Creation Using HMPS Method and CA-IESO method  [Not invited]

  Yuto Otsubo; Daiji Fujii; Shinya Matsumoto

  The 12th International Symposium on Architectural Interchanges in Asia  2018/10
• Building design using topology optimization method  [Not invited]

  Momoko Watanabe; Shinya Matsumoto; Daiji Fujii

  Proceedings of the IASS Annual Symposium 2017  2017/09
• Topology optimization of 3D structures using Hamiltonian MPS method and Improved ESO method  [Not invited]

  Masaki Yamashita; Masatoshi Manabe; Shinya Matsumoto; Daiji Fujii

  Proceedings of the IASS Annual Symposium 2017  2017/09
• Computational morphogenesis of continuum shell structures using Improved ESO method  [Not invited]

  Koichi Kamimura; Shinya Matsumoto; Daiji Fujii

  roceedings of the IASS Annual Symposium 2017  2017/09
• Topology optimization of 3D structure using improved ESO method  [Not invited]

  Y. NIIUCHI; S. MATSUMOTO; D. FUJII

  Proceedings of the IASS Annual Symposium 2016  2016/09
• Optimum Reinforcement of Floor Slab by CFRP using Topology Optimization Method

  K. Koizumi; D. Fujii; T. Morimura

  The Third Chaina-Japan-Korea Joint Symposium on Optimization of Structural and Mechanical Systems (CJK-OSM-3)  2004/11
• Topology optimization of continuum using nodeless hybrid element

  D. Fujii; M. Kitayama; K. Suzuki; T. Kawai

  5th World Congress on Computational Mechanics (WCCM V)  2002/07
• Shell and solid mixed analysis using overlaying mesh method  [Not invited]

  S. Nakasumi; K. Suzuki; D. Fujii; H. Ohtsubo

  5th World Congress on Computational Mechanics (WCCM V)  2002/07
• Meshless discrete analysis using finite cover method  [Not invited]

  K. Suzuki; D. Fujii; H. Ohtsubo

  5th World Congress on Computational Mechanics (WCCM V)  2002/07
• Filtering method for topology optimization analysis using optimality criteria method  [Not invited]

  D. Fujii; K. Suzuki; H. Ohtsubo

  IASS Symposium on Theory, Design and Realization of Shell and Spatial Structures  2001/11
• Topology optimization of elastic link mechanisms  [Not invited]

  D. Fujii; K. Suzuki; H. Ohtsubo; M. Ishikawa

  Sixth U. S. National Congress on Computational Mechanics  2001/08
• A study on the analysis of the different stiffness model by overlaying mesh method  [Not invited]

  S. Nakasumi; K. Suzuki; D. Fujii; H. Ohtsubo

  Sixth U. S. National Congress on Computational Mechanics  2001/08
• Optimal shape design of thin-walled beam structures with continuously variable cross section  [Not invited]

  D. Fujii; Y. Fujitani

  4th World Congress on Computational Mechanics  1998
• Finite Element Analysis of General Formed Thin-walled Beams Considering Shear Warping Deformation  [Not invited]

  D. Fujii; Y. Fujitani

  Advances in Computational Engineering Science, Edited by S.N. Atluri and G. Yagawa, Tech Science Press, (ICES'97)  1997
• A Finite Element Analysis for Thin-walled Beam Structure with Discontinuously variable cross-section  [Not invited]

  D. Fujii; S. W. Park; Y. Fujitani

  Challenges to Civil and Mechanical Engineering in 2000 and Beyond, Proceedings of the International Conference Wroclaw  1997
• Elasto-plastic Earthquake Response Analysis of Framed Structure  [Not invited]

  Y. Fujitani; D.Fujii; S. Matsumoto

  Challenges to Civil and Mechanical Engineering in 2000 and Beyond, Proceedings of the International Conference Wroclaw  1997
• Structural Analysis of Thin-walled Framed Structure based on the Bending-Torsional Theory of Beams  [Not invited]

  Y. Fujitani; D. Fujii

  Seventh International Conference on Computing in Civil and Building Engineering  1997
• A structural analysis method of framed structures with thin-walled open section members based on the bending-torsional theory of beams  [Not invited]

  Y. Fujitani; D. Fujii

  4th World Congress on Computational Mechanics  1996
• Structural Optimization Analysis of Super High Rise Building by the Finite Element Method based on Thin-Walled Beam Theory  [Not invited]

  D. Fujii; Y. Fujitani

  The Third World Congress on Computational Mechanics(WCCMIV)  1994
• Structural optimization analysis of high rise building by using thin-walled beam theory considering shear effect  [Not invited]

  D. Fujii; Y. Fujitani

  The Sixth International Conference on Computing in Civil and Building Engineering  1994
• The Static and Dynamic Analysis of Framed Structures with Pin-joint by Finite Element Method  [Not invited]

  Y. Fujitani; D. Fujii; K. Imamura

  International Conference on Education, Practice and Promotion of Computational Methods in Engineering using Small Computers held at Dalian  1992
• Finite Element Analysis of Super High Rised Building by Thin-walled Beam Theory  [Not invited]

  Y. Fujitani; D. Fujii; M. Fukuyama

  International Conference on Education, Practice and Promotion of Computational Methods in Engineering using Small Computers held at Dalian  1992

MISC

• ESO法を用いた木造骨組における接合部装着型ダンパーの最適配置問題

  永岡伊玖磨; 松本慎也; 藤井大地  近畿大学工学部研究報告  (50)  33  -37  2018/10
• Morphogenesis of latticed shell structures using ESO method and traction method

  KOSAKA Kenji; MATSUMOTO Shinya; FUJII Daiji  Proceedings of annual research meeting Chugoku Chapter, Architectural Institute of Japan (AIJ)  40-  77  -80  2017/03
• Optimal placement of damping dampers for building structure using multi-mass system model and ESO method

  YAMASAKI Shinichi; MATSUMOTO Shinya; FUJII Daiji  Proceedings of annual research meeting Chugoku Chapter, Architectural Institute of Japan (AIJ)  40-  81  -84  2017/03
• Optimal placement of response control damper using ESO method

  山崎 進一; 松本 慎也; 藤井 大地  日本建築学会中国支部研究報告集 日本建築学会中国支部 編  40-  73  -76  2017/03
• Facade design of buildings using IESO method : Design of prefab shear wall with two axial symmetry condition

  丸山 瑞樹; 松本 慎也; 藤井 大地  日本建築学会中国支部研究報告集 日本建築学会中国支部 編  40-  89  -92  2017/03
• 巨大地震に対する中層免震建物の応答特性

  藤井大地; 眞田瑞穂; 岡部 諒; 松本慎也; 西 伸介  近畿大学工学部研究報告  (48)  41  -46  2016/12
• Topology optimization of 3D structures using CA-ESO method and voxel finite element method

  OKABE Ryo; FUJII Daiji; MANABE Masatoshi  Proceedings of annual research meeting Chugoku Chapter, Architectural Institute of Japan (AIJ)  38-  85  -88  2015/03
• 20194 Topology optimization of 3D structures using CA-ESO method and voxel finite element method

  OKABE Ryo; FUJII Daiji; MANABE Masatoshi  Summaries of technical papers of annual meeting  2014-  387  -388  2014/09
• Comparative performance of topology optimization of 3D structures using CA-ESO method

  OKABE Ryo; FUJII Daiji; MANABE Masatoshi  Proceedings of annual research meeting Chugoku Chapter, Architectural Institute of Japan (AIJ)  37-  93  -96  2014/03
• 20472 Comparative performance of topology optimization of structures using CA-ESO method

  FUJII Daiji; MANABE Masatoshi  Summaries of technical papers of annual meeting  2013-  943  -944  2013/08
• 248 Optimum placement of response control damper using topology optimization method for frame Structure

  KUBO Kazuki; HIRAMOTO Shinya; FUJII Daiji; OHTA Kazuhiko  Proceedings of annual research meeting Chugoku Chapter, Architectural Institute of Japan (AIJ)  35-  277  -280  2012/03
• 209 Comparison between CA-ESO method and method based on mathematical programming in morphogenesis

  MANO Akito; SHIGEZANE Katsuya; FUJII Daiji; MANABE Masatoshi  Proceedings of annual research meeting Chugoku Chapter, Architectural Institute of Japan (AIJ)  35-  121  -124  2012/03
• 218 Optimum placement of response control damper using topology optimization method for frame Structure

  KUBO Kazuki; HATASHI Yuuya; FUJII Daiji; OHTA Kazuhiko  Proceedings of annual research meeting Chugoku Chapter, Architectural Institute of Japan (AIJ)  34-  101  -104  2011/03
• 212 Comparison between CA-ESO method and method based on mathematical programming in morphogenesis

  MANO Akito; SHIGEZANE Katsuya; FUJII Daiji; MANABE Masatoshi  Proceedings of annual research meeting Chugoku Chapter, Architectural Institute of Japan (AIJ)  34-  77  -80  2011/03
• 骨組の位相最適化手法を用いた制震ダンパーの最適配置

  久保和毅; 藤井大地; 大田和彦; 野中哲也  近畿大学工学部研究報告  (44)  53  -58  2010/12
• 204 Study on Topology Optimization of Structure using CA-ESO Method

  MANO Akito; FUJII Daiji; MANABE Masatoshi  Proceedings of annual research meeting Chugoku Chapter, Architectural Institute of Japan (AIJ)  33-  "204  -1"-"204-4"  2010/03
• 203 Sensitivity Analysis in Shape Optimization of Framed Structure

  SAJI Kazuya; FUJII Daiji  Proceedings of annual research meeting Chugoku Chapter, Architectural Institute of Japan (AIJ)  33-  "203  -1"-"203-4"  2010/03
• 205 Study on Optimum Layout of Damper in Building Structure

  KUBO Kazuki; FUJII Daiji  Proceedings of annual research meeting Chugoku Chapter, Architectural Institute of Japan (AIJ)  33-  "205  -1"-"205-4"  2010/03
• 活動レポート「コロキウム構造形態の解析と創生2009」

  藤井大地; 本間俊雄; 池田靖史; 松尾智恵; 立道郁夫  建築雑誌  125-  (1600)  103  -105  2010/02
• 20173 Topology Optimization of Three Dimensional Frame Structure using Ground Structure Approach

  SAJI Kazuya; Fujii Daiji  Summaries of technical papers of Annual Meeting Architectural Institute of Japan. B-1, Structures I, Loads, reliability stress analyses foundation structures shell structures, space frames and membrane structures  2009-  345  -346  2009/07
• 20175 Heuristics based Topology Optimization using Particle Method for Elastic Materials with Finite Deformation

  MANABE Masatoshi; FUJII Daiji  Summaries of technical papers of Annual Meeting Architectural Institute of Japan. B-1, Structures I, Loads, reliability stress analyses foundation structures shell structures, space frames and membrane structures  2009-  349  -350  2009/07
• 22247 Development of Low Cost Seismic Performance Evaluation Technique for Existing Wood House

  MOTOKAWA Eiji; FUJII Daiji  Summaries of technical papers of Annual Meeting Architectural Institute of Japan. C-1, Structures III, Timber structures steel structures steel reinforced concrete structures  2009-  493  -494  2009/07
• 201 Topology Optimization for Elastic Material using Particle Method : Application of CA-ESO Method

  MANABE Masatoshi; FUJII Daiji  Proceedings of annual research meeting Chugoku Chapter, Architectural Institute of Japan (AIJ)  32-  "201  -1"-"201-4"  2009/03
• 20209 Study on Convergence of solution in Ground Structure Approach using Nonlinear Programming

  MANABE Masatoshi; FUJII Daiji; TAKADA Toyofumi  Summaries of technical papers of Annual Meeting Architectural Institute of Japan. B-1, Structures I, Loads, reliability stress analyses foundation structures shell structures, space frames and membrane structures  2008-  417  -418  2008/07
• 201 Comparison of Deformation method and Traction method for shape optimization of shell structure

  Noi Hiromi; Fujii Daiji  Proceedings of annual research meeting Chugoku Chapter, Architectural Institute of Japan (AIJ)  31-  "201  -1"-"201-4"  2008/03
• 208 Destruction Simulation of Structural Member using MPS Method

  MANABE Masatoshi; FUJII Daiji  Proceedings of annual research meeting Chugoku Chapter, Architectural Institute of Japan (AIJ)  31-  "208  -1"-"208-4"  2008/03
• 活動レポート「コロキウム構造形態の解析と創生2007」

  藤井大地; 本間俊雄; 松尾智恵; 立道郁夫  建築雑誌  123-  (1574)  55  -57  2008/03
• 対談「建築構造わかったことわからないこと ものづくりとコンピュータ－空間構造」

  大森博司; 藤井大地; 渡辺邦夫  建築雑誌  122-  (1567)  28  -33  2007/10
• 合理的な構造の可視化

  藤井大地  建築雑誌  122-  (1565)  34  -35  2007/08
• 20414 Shape optimization of shell structure Using Deformation method : Inspection of Deformation method and Traction method

  NOI Hiromi; SAKURADANI Kenta; FUJII Daiji  Summaries of technical papers of Annual Meeting Architectural Institute of Japan. B-1, Structures I, Loads, reliability stress analyses foundation structures shell structures, space frames and membrane structures  2007-  827  -828  2007/07
• 20418 Creation of damping mechanism using topology optimization method for continuum : Search of the global optimization solution using SA

  FUJII Daiji; TANIZAWA Tsuyoshi  Summaries of technical papers of Annual Meeting Architectural Institute of Japan. B-1, Structures I, Loads, reliability stress analyses foundation structures shell structures, space frames and membrane structures  2007-  835  -836  2007/07
• 20415 Shape optimization of shell structure using deformation method : Part 2 Inspection of frame shell structures

  SAKURADANI Kenta; NOI Hiromi; FUJII Daiji  Summaries of technical papers of Annual Meeting Architectural Institute of Japan. B-1, Structures I, Loads, reliability stress analyses foundation structures shell structures, space frames and membrane structures  2007-  829  -830  2007/07
• 20138 Study on large deformation analysis of structure using Moving Particle Semi-implicit Method

  MANABE Masatoshi; FUJII Daiji  Summaries of technical papers of Annual Meeting Architectural Institute of Japan. B-1, Structures I, Loads, reliability stress analyses foundation structures shell structures, space frames and membrane structures  2007-  275  -276  2007/07
• 250 Creation of damping mechanism using topology optimization method for continuum : Search of the global optimization solution using SA

  TANIZAWA Tsuyoshi; FUJII Daiji  日本建築学会中国支部研究報告集  30-  237  -240  2007/03
• 251 Optimum Reinforcement of Floor Slab with damage by CFRP using Topology Optimization Method

  TAMIYA Tomoyuki; FUJII Daiji; MORIMURA Tsuyoshi  日本建築学会中国支部研究報告集  30-  241  -244  2007/03
• 254 Shape optimization of shell structure using deformation method : Part2 Case of frame shell structures

  SAKURADANI Kenta; NOI Hiromi; FUJII Daiji  日本建築学会中国支部研究報告集  30-  253  -256  2007/03
• Simulation of fatigue cracks in orthotropic steel decks with X-FEM

  Rei Nakagawa; Katsuyuki Suzuki; Yasuyuki Kurihara; Shogo Nakasumi  Journal of Structural Engineering, A  53A-  141  -147  2007  [Refereed]
  
• 20120 Creation of damping mechanism using topology optimization method for continuum

  TANIZAWA Tsuyoshi; FUJII Daiji  Summaries of technical papers of Annual Meeting Architectural Institute of Japan. B-1, Structures I, Loads, reliability stress analyses foundation structures shell structures, space frames and membrane structures  2006-  239  -240  2006/07
• 228 Shape optimization of building structure using Traction Method

  NOI Hiromi; FUJII Daiji  日本建築学会中国支部研究報告集  29-  153  -156  2006/03
• 20116 Study on Shape Optimization of Building Structure using Displacement Vector Method

  NOI HIROMI; FUJII Daiji  Summaries of technical papers of Annual Meeting Architectural Institute of Japan. B-1, Structures I, Loads, reliability stress analyses foundation structures shell structures, space frames and membrane structures  231  -232  2006
• 2-221 A Practice on Improvement of Architectural Education System

  CUI Jun; MATSUDA Hiroyuki; OHTA Kazuhiko; FUJII Daiji  工学・工業教育研究講演会講演論文集  17-  264  -265  2005/09
• 5-223 Creative Lecture Combining Structure and Design of Buildings in Architecture

  FUJII Daiji; MATSUDA Hiroyuki; OHTA Kazuhiko; CUI Jun  工学・工業教育研究講演会講演論文集  17-  370  -371  2005/09
• 1-327 The Development of System and Concrete Method for JABEE Application : An Example of a Department of Architecture

  MATSUDA Hiroyuki; OHTA Kazuhiko; FUJII Daiji; CUI Jun  工学・工業教育研究講演会講演論文集  17-  656  -657  2005/09
• 20183 Optimum Reinforcement of Floor Slab by CFRP using Topology Optimization Method : Part 2. Optimum reinforcement of slab with damage

  TAMIYA Tomoyuki; NAKAGAWA Kyoichi; FUJII Daiji; MORIMURA Tsuyoshi  Summaries of technical papers of Annual Meeting Architectural Institute of Japan. B-1, Structures I, Loads, reliability stress analyses foundation structures shell structures, space frames and membrane structures  2005-  365  -366  2005/07
• 20182 Optimum Reinforcement of Floor Slab by CFRP using Topology Optimization Method : Part 1. Optimum reinforcement of slab with difference level

  NAKAGAWA Kyoichi; FUJII Daiji; Morimura Tsuyoshi  Summaries of technical papers of Annual Meeting Architectural Institute of Japan. B-1, Structures I, Loads, reliability stress analyses foundation structures shell structures, space frames and membrane structures  2005-  363  -364  2005/07
• 20184 Creation of damping mechanism using topology optimization method for continuum

  TANIZAWA Tsuyoshi; FUJII Daiji  Summaries of technical papers of Annual Meeting Architectural Institute of Japan. B-1, Structures I, Loads, reliability stress analyses foundation structures shell structures, space frames and membrane structures  2005-  367  -368  2005/07
• 213 A study on footing isolator of the detached house which used a disposal tire

  SHINBA Ryo; FUJII Daiji  日本建築学会中国支部研究報告集  28-  105  -108  2005/03
• 264 Optimum Reinforcement of Floor Slab by CFRP using Topology Optimization Method : Part 1. Optimum reinforcement of slab with difference level

  NAKAGAWA Kyoichi; FUJII Daiji  日本建築学会中国支部研究報告集  28-  309  -312  2005/03
• 241 Study on creation of damping mechanism using topology optimization method for frame structure

  HARADA Takuya; FUJII Daiji  日本建築学会中国支部研究報告集  28-  217  -220  2005/03
• 253 A Study On The Load-Deflection Properties by Pipe Arrangement Method of Restrained Hollow-Slabs

  MORIMURA Tsuyoshi; HUJII Daichi  日本建築学会中国支部研究報告集  28-  265  -268  2005/03
• 240 A study on creation of damping mechanism using topology optimization method for continuum

  TANIZAWA Tsuyoshi; FUJII Daiji  日本建築学会中国支部研究報告集  28-  213  -216  2005/03
• 23070 Optimum Reinforcement of Floor Slab by CFRP using Topology Optimization Method : Part 2. Optimum reinforcement of slab with difference level

  NAKAGAWA Kyoichi; KOIZUMI Tomohiko; FUJII Daiji  Summaries of technical papers of Annual Meeting Architectural Institute of Japan. C-2, Structures IV, Reinforced concrete structures prestressed concrete structures masonry wall structures  2004-  139  -140  2004/07
• 23069 Optimum Reinforcement of Floor Slab by CFRP using Topology Optimization Method : Part 1. Optimum reinforcement of void slab

  FUJII Daiji; KOIZUMI Tomohiko; MORIMURA Tsuyoshi  Summaries of technical papers of Annual Meeting Architectural Institute of Japan. C-2, Structures IV, Reinforced concrete structures prestressed concrete structures masonry wall structures  2004-  137  -138  2004/07
• 21218 Housing quake-free system using waste tires : Part 2 stiffness and response analysis of using waste tires

  SHINBA Ryo; FUJII Daiji  Summaries of technical papers of Annual Meeting Architectural Institute of Japan. B-2, Structures II, Structural dynamics nuclear power plants  2004-  435  -436  2004/07
• 技術ノート 建築システムのための最適化④ 形の最適化

  藤井 大地  建築雑誌  118-  (1512)  54  -55  2003/12
• Motion Design of CG using Inverse Analysis

  KIRIYAMA Hayato; SASAYA Kiyotaka; SUZUKI Katsuyuki; OHTSUBO Hideomi  The Computational Mechanics Conference  2003-  (16)  17  -18  2003/11
• A study on the definition of local area in mesh superposition method

  SHINMURA Daisuke; SUZUKI Katsuyuki; OHTSUBO Hideomi  The Computational Mechanics Conference  2003-  (16)  595  -596  2003/11
• Crack Propagation Analysis using Mesh Superposition Method and X-FEM

  NAKASUMI Shogo; SUZUKI Katsuyuki; OHTSUBO Hideomi  The Computational Mechanics Conference  2003-  (16)  951  -952  2003/11
• Development of HIFU Simulation System Using Wave Motion Analysis and Heat Conduction Analysis

  SUZUKI Katsuyuki; Fujii Daiji; OHTSUBO Hideomi  The Computational Mechanics Conference  2003-  (16)  333  -334  2003/11
• 2003A-OS1-6 Recent Development and Future in the Voxel Analysis and Finite Cover Method

  Suzuki Katsuyuki; Ohtsubo Hideomi  Conference proceedings the Society of Naval Architects of Japan  (2)  11  -12  2003/11
• 22068 Housing quake-free system using waste tires

  SHINBA Ryo; FUJII Daiji  Summaries of technical papers of Annual Meeting Architectural Institute of Japan. C-1, Structures III, Timber structures steel structures steel reinforced concrete structures  2003-  135  -136  2003/07
• 213 Study on housing quake-free system using waste tires

  SHINBA Ryo; FUJII Daiji  日本建築学会中国支部研究報告集  26-  151  -154  2003/03
• 212 Development of high performance damping mechanism using topology optimization method for frame structure

  HARADA Takuya; FUJII Daiji; HIRATA Yuichi  日本建築学会中国支部研究報告集  26-  147  -150  2003/03
• 263 Development of software of structural analysis using Excel VBA

  FUJII Daiji  日本建築学会中国支部研究報告集  26-  349  -352  2003/03
• 266 A Study On The Shear Reinforcing and The Load-Deflection Properties of Restrained Square Hollow-Slabs

  MORIMURA tsuyoshi; KOIZUMI Tomohiko; HUJII Daichi  日本建築学会中国支部研究報告集  26-  361  -364  2003/03
• HIFU Simulation using Voxel Analysis

  SUZUKI Katsuyuki; Fujii Daiji; OHTSUBO Hideomi  バイオエンジニアリング講演会講演論文集  2003-  (15)  153  -154  2003/01
• Mixed analysis of shell and solid elements using the overlaying mesh method

  NAKASUMI SHOGO; SUZUKI KATSUYUKI; FUJII DAIJI; OHTSUBO HIDEOMI  J. Marine Sci. Tech.  7-  (4)  180  -188  2003/01
• Crack analysis using combination of overlaying mesh method and X-FEM

  NAKASUMI Shogo; SUZUKI Katsuyuki; OHTSUBO Hideomi  The Computational Mechanics Conference  2002-  (15)  667  -668  2002/10
• A study on iteration method of global local analysis using overlaying mesh method

  SHINMURA Daisuke; SUZUKI Katsuyuki; NAKASUMI Shogo; OHTSUBO Hideomi  The Computational Mechanics Conference  2002-  (15)  291  -292  2002/10
• The Seapage Flow Analysis of Bedrock Using Multilevel Voxel Finite Cover Method

  SUZUKI Katsuyuki; KAMINAGA Akihiro; Fujii Daiji; OHTSUBO Hideomi; SHIGENO Yoshimasa  The Computational Mechanics Conference  2002-  (15)  341  -342  2002/10
• Analysis of Shell Structure Using GFEM

  SUZUKI Katsuyuki; YOSHIGAMI Shuji; Fujii Daiji; OHTSUBO Hideomi  The Computational Mechanics Conference  2002-  (15)  351  -352  2002/10
• マルチレベル有限被覆法によるアダプティブ浸透流解析

  鈴木克幸; 上永明宏; 藤井大地; 大坪英臣; 重野喜政  土木学会応用力学論文集  5-  2002/09  [Refereed]
  
• Surface crack analysis using shell-solid overlaying mesh analysis

  NAKASUMI Shogo; SUZUKI Katsuyuki; FUJII Daiji; OHTSUBO Hideomi  計算工学講演会論文集  7-  (2)  525  -528  2002/05
• An adaptive topology optimization of continuum using the multi-voxel method

  SAKA Toshihide; FUJII Daiji; SUZUKI Katsuyuki; OHTSUBO Hideomi  計算工学講演会論文集  7-  (2)  861  -864  2002/05
• Global Local Iterative Analysis Using Overlaying Mesh Method

  Suzuki Katsuyuki; Ohtsubo Hideomi; Nakasumi Shogo; Shinmura Daisuke  Journal of the Japan Society of Naval Architects and Ocean Engineers  Vol.192 ,691-696-  (192)  691  -696  2002
• Development of a 3-D topology optimization design tool using multi-level voxel method

  SAKA Toshihide; SUZUKI Katsuyuki; FUJII Daiji  第5回最適化シンポジウム講演論文集, (2002-10)  241  -246  2002
• 367 Proposal of nodeless hybrid element and its application to topology optimization problem

  FUJII Daiji; KITAYAMA Mitsunari; SUZUKI Katsuyuki; OHTSUBO Hideomi; KAZAMA Etsuo; KAWAI Tadahiko  The Computational Mechanics Conference  2001-  (14)  397  -398  2001/11
• 369 CG Animation of Firework Using Particle Simulation

  KODAMA Kohei; SUZUKI Katsuyuki; OHTSUBO Hideomi  The Computational Mechanics Conference  2001-  (14)  401  -402  2001/11
• 352 Application of FCM to Discrete Bending Problem

  SUZUKI Katsuyuki; FUJII Daiji; OHTSUBO Hideomi; YOSHIDA Hirotoshi  The Computational Mechanics Conference  2001-  (14)  367  -368  2001/11
• 204 Shell-solid mixed analysis using overlaying mesh method

  NAKASUMI Shogo; SUZUKI Katsuyuki; FUJII Daiji; OHTSUBO Hideomi  The Computational Mechanics Conference  2001-  (14)  131  -132  2001/11
• 2304 The Quantative Analysis of Tactile Sensation and Design of Surface Shape

  SUZUKI Katsuyuki; FUJII Daiji; OHTSUBO Hideomi; KOJIMA Takeshi; NISHIHARA Teppei  設計工学・システム部門講演会講演論文集  2001-  (11)  171  -172  2001/11
• 2212 Design of link-mechanisms using topology optimization method

  FUJII Daiji; ISHIKAWA Masai; SUZUKI Katsuyuki; OHTSUBO Hideomi  設計工学・システム部門講演会講演論文集  2001-  (11)  145  -148  2001/11
• CONLINを用いた3次元構造物の位相最適化

  藤井大地; 鈴木克幸; 大坪英臣  土木学会応用力学論文集  4-  69  -77  2001/10  [Refereed]
  
• 重合メッシュ法を用いた板曲げ問題の解析に関する一考察

  中住昭吾; 鈴木克幸; 藤井大地; 大坪英臣  土木学会応用力学論文集  4-  79  -84  2001/10  [Refereed]
  
• TOPOLOGY OPTIMIZATION OF COMPLIANT MECHANISMS CONSIDERING RIGIDITY OF CONNECTIONS

  FUJII Daiji; ISHIKAWA Masai; SUZUKI Katsuyuki; OHTSUBO Hideomi  計算工学講演会論文集  6-  (2)  789  -792  2001/05
• ANALYSIS OF FRACTURE OF LEVEL ICE USING THE FINITE COVER METHOD

  YOSHIDA Hirotoshi; SUZUKI Katsuyuki; FUJII Daiji; OHTSUBO Hideomi  計算工学講演会論文集  6-  (2)  487  -490  2001/05
• CREATING CG ANIMATION OF FRACTURE BY SPH METHOD

  ADACHI Masanao; SUZUKI Katsuyuki; FUJII Daichi; OHTSUBO Hideomi  計算工学講演会論文集  6-  (2)  511  -514  2001/05
• PERFORMANCE EVALUATION OF CONLIN OPTIMIZER IN TOPOLOGY OPTIMIZATION

  FUJII Daiji; SUZUKI Katsuyuki; OHTSUBO Hideomi  計算工学講演会論文集  6-  (2)  739  -742  2001/05
• Linear and nonlinear multiscale analysis using overlaying mesh method

  NAKASUMI Shogo; SUZUKI Katsuyuki; FUJII Daiji; OHTSUBO Hideomi  The Computational Mechanics Conference  2000-  (13)  781  -782  2000/11
• Filtering method for topology optimization of continuum structures

  FUJII Daiji; SUZUKI Katsuyuki; OHTSUBO Hideomi  The Computational Mechanics Conference  2000-  (13)  325  -326  2000/11
• Development of conceptual design tools for education of architecture

  FUJII Daiji; SUZUKI Katsuyuki; OHTSUBO Hideomi  The Computational Mechanics Conference  2000-  (13)  279  -280  2000/11
• RESPONSE SURFACE MODEL USING MOVING LEAST SQUARES METHOD

  KAMINAGA Akihiro; SUZUKI Katsuyuki; FUJII Daiji; OHTSUBO Hideomi  最適化シンポジウム講演論文集  2000-  (4)  181  -186  2000/10
• Optimum arrangement design of semi-rigid in the builfding frame

  SANDO Atsushi; MASTSUMOTO Shinya; FUJII Daiji; FUJITANI Yoshinobu  Summaries of technical papers of Annual Meeting Architectural Institute of Japan. B-1, Structures I, Loads, reliability stress analyses foundation structures shell structures, space frames and membrane structures  2000-  375  -376  2000/07
• OPTIMAL DESIGN BY RESPONSE SURFACE MODEL USING MOVING LEAST SQUARES METHOD

  KAMINAGA Akihiro; SUZUKI Katsuyuki; FUJII Daichi; OHTSUBO Hideomi  Proceedings of the conference on computational engineering and science  5-  (2)  467  -470  2000/05
• DESIGN OF COMPLIANT MECHANISMS USING THE GRAND STRUCTURE APPROACH

  EJIMA Susumu; FUJII Daiji; KIKUCHI Noboru  計算工学講演会論文集  5-  (2)  445  -446  2000/05
• 鉄の新世紀・第10回－建築構造設計の世界に新機軸，形態解析を用いた建築デザイン

  藤井大地  鋼構造ジャーナル  (932)  16  -16  2000/05
• 242 接合部のコストを考慮した半剛接建物の最小コスト設計(建築構造)

  松本 慎也; 藤井 大地; 藤谷 義信  日本建築学会中国支部研究報告集  23-  169  -172  2000/03
• 246 材料非線形を考慮した骨組構造の最適解析(建築構造)

  藤原 亮二; 松本 慎也; 藤井 大地; 藤谷 義信  日本建築学会中国支部研究報告集  23-  185  -188  2000/03
• 建築骨組における半剛接合部の最適配置設計

  山東篤; 松本慎也; 藤井大地; 藤谷義信  日本建築学会学術講演梗概集B-1 構造1  2000-  2000
• Topology optimization of structures using the density approach

  FUJII Daiji; SUZUKI Katsuyuki; OHTSUBO Hideomi  最適化シンポジウム講演論文集, 2000  4-  127  -132  2000
• Optimization Problem of the Plane Frame Structure allowing the Ultimate Strength

  FUJIHARA Ryoji; MATSUMOTO Shinya; FUJII Daiji; FUJITANI Yoshinobu  Summaries of technical papers of Annual Meeting Architectural Institute of Japan. B-1, Structures I, Loads, reliability stress analyses foundation structures shell structures, space frames and membrane structures  1999-  341  -342  1999/07
• Minimum Weight Design of Semi-rigid Connected Steel Frames : Part1. Stiffness Evaluation of Semi-rigid Connections by Mathematical Programming

  MATSUMOTO Shinya; KASUGA Yasuhiro; FUJII Daiji; FUJITANI Yoshinobu  Summaries of technical papers of Annual Meeting Architectural Institute of Japan. B-1, Structures I, Loads, reliability stress analyses foundation structures shell structures, space frames and membrane structures  1999-  333  -334  1999/07
• Consideration on the Beam Model with the Concentration of Deformations at its Ends

  HIRATA Yuichi; MATSUMOTO Shinya; FUJII Daiji; FUJITANI Yoshinobu  Summaries of technical papers of Annual Meeting Architectural Institute of Japan. B-1, Structures I, Loads, reliability stress analyses foundation structures shell structures, space frames and membrane structures  1999-  331  -332  1999/07
• Basic Study on the Analysis Method of the Framed Structure using Fiber Model

  DOI Takashi; MATSUMOTO Shinya; FUJII Daiji; FUJITANI Yoshinobu  Summaries of technical papers of Annual Meeting Architectural Institute of Japan. B-1, Structures I, Loads, reliability stress analyses foundation structures shell structures, space frames and membrane structures  1999-  311  -312  1999/07
• DYNAMIC ANALYSIS OF FRAMED STRUCTURES WITH SEMI-RIGID CONNECTIONS USING A STATIC CONDENSATION TECHNIQUE

  MATSUMOTO Shinya; FUJII Daiji; FUJITANI Yoshinobu  Proceedings of the conference on computational engineering and science  2-  (3)  975  -978  1999/05
• Topology Optimization using The Homogenization Design Method : Improvement of numerical instabilities in the optimization using SLP method

  FUJII Daiji; KIKUCHI Noboru  Proceedings of the conference on computational engineering and science  4-  (1)  515  -518  1999/05
• 233 終局耐力を考慮した平面骨組における断面の最適化問題(建築構造)

  藤原 亮二; 松本 慎也; 藤井 大地; 藤谷 義信  日本建築学会中国支部研究報告集  22-  153  -156  1999/03
• 230 ファイバーモデルによる骨組の弾塑性解析法に関する研究(建築構造)

  土井 尚; 松本 慎也; 藤井 大地; 藤谷 義信  日本建築学会中国支部研究報告集  22-  141  -144  1999/03
• 梁せいを制約した鉄骨骨組構造の最小重量設計

  松本慎也; 藤井 大地; 藤谷 義信  日本建築学会中国支部研究報告書  22-  221  -224  1999
• Optimal Layout of Semi-rigid Connected Steel Frames by Genetic Algorithm

  MATSUMOTO Shinya; UESUGI Yoshinori; FUJII Daichi; FUJITANI Yoshinobu  Summaries of technical papers of Annual Meeting Architectural Institute of Japan. B-1, Structures I, Loads, reliability stress analyses foundation structures shell structures, space frames and membrane structures  1998-  435  -436  1998/07
• On the Independence of Approximation Function in Finite Cover Method

  JIN Chuanrong; NAKANISHI Katsuyoshi; SUZUKI Katsuyuki; OHTSUBO Hideomi  Proceedings of the conference on computational engineering and science  3-  (2)  381  -384  1998/05
• Optimal Design of Semi-rigid Connected Steel Frames : Part. 2 Optimal Layout of Semi-rigid Connections by Genetic Algorithm

  MATSUMOTO Shinya; UESUGI Yoshinori; FUJII Daiji; FUJITANI Yoshinobu  Proceedings of the conference on computational engineering and science  3-  (2)  645  -648  1998/05
• 223 地盤改良体が建物の動的特性に及ぼす効果に関する研究(建築構造)

  松本 慎也; 藤井 大地; 吉田 長行; 藤谷 義信  日本建築学会中国支部研究報告集  21-  101  -104  1998/03
• 地盤と建物の動的相互作用に及ぼす地盤改良の効果

  松本慎也; 藤井大地; 吉田長行; 藤谷義信; 黄弘量; 日比野信一  第10回地震工学シンポジウム論文集  2-  1855  -1860  1998  [Refereed]
  
• Elasto-Plastic Analysis of Framed with Semi-rigid Joints : Part3 Examination for various stories and spans

  UESUGI Yoshinori; MATUMOTO Shinya; FUJII Daiji; FUJITANI Yoshinobu  Summaries of technical papers of Annual Meeting Architectural Institute of Japan. C-1, Structures III, Timber structures steel structures steel reinforced concrete structures  1997-  371  -372  1997/07
• Dynamic Analysis of Framed Structures with Semi-rigid Connections Using a Static Condensation Technique

  MATSUMOTO Shinya; FUJII Daiji; FUJITANI Yoshinobu  Summaries of technical papers of Annual Meeting Architectural Institute of Japan. B-1, Structures I, Loads, reliability stress analyses foundation structures shell structures, space frames and membrane structures  1997-  365  -366  1997/07
• THE CONSTRAINTS BETWEEN SUBSYSTEMS IN THE DISTRIBUTED STRUCTURAL OPTIMIZATION

  SUZUKI Katsuyuki; OHTSUBO Hideomi  Proceedings of the conference on computational engineering and science  2-  (2)  613  -616  1997/05
• THE OPTIMAL DESIGN BY THE INCLUSIVE MODEL OF DESIGN MODEL AND ANALYSIS MODEL

  SUZUKI Katsuyuki; OHTSUBO Hideomi  Proceedings of the conference on computational engineering and science  2-  (2)  559  -562  1997/05
• 半剛接合部を有する骨組の静的弾塑性特性(建築構造B)

  上杉 義則; 松本 慎也; 藤井 大地; 藤谷 義信  日本建築学会中国支部研究報告集  20-  97  -100  1997/03
• Development and Evaluation of Finite Element for The Dynamic Analysis of Framed Structure with Semi-rigid Connections

  Matsumoto Shinya; Fujii Daiji; Fujitani Yoshinobu  Bulletin of the Faculty of Engineering, Hiroshima University  46-  (1)  79  -85  1997  [Refereed]
  
• Elasto-Plastic Analysis of Structure with Semi-rigid Joints : Part 2 Seismic Response Analysis

  MATSUMOTO Shinya; FUJII Daiji; FUMITANI Yoshinobu; NONAKA Tetsuya  Summaries of technical papers of Annual Meeting Architectural Institute of Japan. C-1, Structures III, Timber structures steel structures steel reinforced concrete structures  1996-  569  -570  1996/07
• Elasto-Plastic Analysis of Structure with Semi-rigid Joints : Part 1 Static Analysis

  UESUGI Yoshinori; MATUMOTO Sinya; FUJII Daiji; FUJITANI Yoshinobu  Summaries of technical papers of Annual Meeting Architectural Institute of Japan. C-1, Structures III, Timber structures steel structures steel reinforced concrete structures  567  -568  1996
• 半剛接合部を有する骨組の弾塑性地震応答解析

  松本慎也; 藤井大地; 藤谷義信  鋼構造年次論文報告集  4-  339  -346  1996  [Refereed]
  
• A method of analysis of frame structure with semi-rigid connections by finite element analysis. : Part2 Natural Vibration Analysis.

  MATSUMOTO Shinya; INOUE Takehumi; FUJII Daiji; FUJITANI Yoshinobu  Summaries of technical papers of Annual Meeting Architectural Institute of Japan. B-1, Structures I, Loads, reliability stress analyses foundation structures shell structures, space frames and membrane structures  1995-  321  -322  1995/07
• A method of analysis of frame structure with semi-rigid connections by finite element analysis. : Part1 Static Analysis.

  INOUE Takefumi; MATSUMOTO Shinya; FUJII Daiji; FUJITANI Yoshinobu  Summaries of technical papers of Annual Meeting Architectural Institute of Japan. B-1, Structures I, Loads, reliability stress analyses foundation structures shell structures, space frames and membrane structures  1995-  319  -320  1995/07
• Prediction of Collision Strength of Side Structures

  Ohtsubo Hideomi; Suzuki Katsuyuki; Yanesato Naoki; Ishizaka Tomoanari  Journal of The Society of Naval Architects of Japan  (178)  421  -427  1995
• The Optiminal Design of Ship Structure by Multi-level Optimization

  Suzuki Katsuyuki; Ohtsubo Hideomi  Journal of The Society of Naval Architects of Japan  (178)  405  -411  1995
• 要素剛性方程式縮約法による厚板の曲げ解析

  藤井大地; 藤谷義信; 松岡秀樹  広島大学工学部研究報告  43-  (2)  175  -181  1995  [Refereed]
  
• 接合部に半剛接バネを有する骨組の有限要素解析

  藤谷義信; 藤井大地; 井上剛史  鋼構造年次論文報告集  3-  69  -76  1995  [Refereed]
  
• Prallel Mesh Generation of Ship Structure Using Object Oriented Finite Element Modeling System

  Kawamura Yasumi; Ohtsubo Hideomi; Suzuki Katsuyuki  Journal of The Society of Naval Architects of Japan  (174)  707  -714  1994
• The Aoutomatic Generation of Finite Element Models for Different Analysis Levels

  Ohtsubo Hideomi; Suzuki Katsuyuki; Hiraki Tokimasa; Kawamura Yasumi  Journal of The Society of Naval Architects of Japan  1994-  (176)  359  -365  1994
• 半剛接節点を有する骨組の有限要素解析

  藤谷義信; 藤井大地; 井上剛史  広島大学工学部研究報告  43-  (1)  45  -52  1994
• 薄肉はり置換法による長方形およびＬ形平面形高層ビルの構造解析

  藤井大地; 藤谷義信  広島大学工学部研究報告  43-  (1)  37  -44  1994  [Refereed]
  

Awards & Honors

• 2020 日本建築学会賞（論文）
   －位相最適化手法を用いた構造形態創生に関する一連の研究－ 

  受賞者: 藤井大地
• 1997 日本建築学会奨励賞
   －薄肉はり置換法による高層ビルの最適設計 薄肉はり置換法による高層ビルの構造解析に関する研究（その３）－ JPN 

  受賞者: 藤井大地

Research Grants & Projects

• 変位増幅機構を備えた制震システムの共同研究

  三菱重工業（株）：

  Date (from‐to) : 2004
• エンジンマウント機構の最適設計手法の開発

  マツダ（株）：

  Date (from‐to) : 2003
• Development of new structure design tools for buildings

  Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research

  Date (from‐to) : 2000 -2001 

  Author : FUJII Daiji

   

  In this study, new structure disegn tools using the topology optimization method were developed for the design of buildings. In the topology optimization tool for frame structure, the ground structure approach was used, and in this tool, semi-righd connections can be treated. In the tool for 2 dimensional structure and shell structure, the homogenization design method was used. In the tool for 3 dimensional structure, the density approach and voxel finite element method were used. In these tools, clear topology can be obtained, because an effective filtering method was applied. In addition, the graphic user interface was developed in order to use for the education. Also, the Optimality criteria method and CONLIN method were used in tools in order to improve the calculation cost. These software will be opened to public as a book with CD from MARUZEN.
• A study for a Structural Analysis Method of Mid-Highrise Buildings by Thin-wallwd Beam Idealization

  Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research

  Date (from‐to) : 1996 -1997 

  Author : FUJITANI Yoshinobu; FUJII Daiji

   

  In this study, a finite element method based on the thin-walled beam theory considering shear warping deformation is presented for the structural analysis of general formed thin-walled beams. The warping deformation is evaluated by the 3D sectional shear warping function added to the classical displacement fields of beams. Because the displacement fields of this model are based on the classical theory, it is possible to apply C1 continuity of the displacement between the neighboring elements in FEM formulation. In order to dissolve the fixed end boundary discrepancy, a boundary contraction method is introduced in the finite element formulation. By the numerical examples of a box girder with open sections and a tapered beam with continuously variable sections, the accuracy and efficiency of the present method are shown. And, in this study, a method of optimizing the shape and the stiffness distribution of a thin-walled beam structure is presented. The thin-walled beam can be analyzed by a finite element method based on the beam theory considering shear warping deformation. The objective for the optimization of shape and stiffness distribution is to minimize the compliance of the structure under the condition of a volume constraint. The size ratio of each cross-section and thickness of membrane plates are selected as the design variables. The optimum design problem is solved by sequential linear programming method. By a fundamental example of 2D cantilever beam, the validity of present method is shown. For the application of present method, highrise building models are analyzed as a thin-walled beam with equivalent strain energy. And the applicability of present method for the structural design or design planning of highrise building is investigated.
• Studies on analysis of elastic fundamental solutions by finite element method

  Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research

  Date (from‐to) : 1990 -1991 

  Author : FUJITANI Yoshinobu; FUJII Daiji

   

  1. Generally, the elastic fundamental solutions in the two and three dimensional elastic body can be aalysed as a eigen-value problem by finite element method. 2. However, the analysis of two dimensional Kelvin's. Boussinesq's and Cerruti's solution results in not the eigenvalue equation, but a simultaneous equation. 3. In three dimensional solutions, though Kelvin's and Boussinesq's solutions can be analyzed as an axi-symmetric problem. Cerruti's solution must be an alysed as plane-symmetric problem. 4. The elastic fundamental solutions and crack front solutions has the stress singularity with r^. The former has an negative integer power, the later has an real or complex power in 0
• 粘弾性多層地盤における埋込み構造物の動的解析

  日本学術振興会：科学研究費助成事業

  Date (from‐to) : 1989 -1989 

  Author : 藤井 大地

Teaching Experience

Synthetic SeminarSynthetic Seminar Kindai University
Structure DesignⅢStructure DesignⅢ Kindai University
Structural PracticeStructural Practice Kindai University
Introduction of ArchitectureIntroduction of Architecture Kindai University
Seminar for Graduation ThesisSeminar for Graduation Thesis Kindai University
Analysis of Statically Indeterminate Structures and Practice ⅠAnalysis of Statically Indeterminate Structures and Practice Ⅰ Kindai University
Strength of Materials and PracticeStrength of Materials and Practice Kindai University
Analysis of Statically Determinate Structures and PracticeAnalysis of Statically Determinate Structures and Practice Kindai University
Analysis of Statically Indeterminate Structures and Practice ⅡAnalysis of Statically Indeterminate Structures and Practice Ⅱ Kindai University
Freshiman SeminarFreshiman Seminar Kindai University
Dynamic Response of Building StructuresDynamic Response of Building Structures Kindai University
Building StructureBuilding Structure Kindai University

Other link

researchmap

https://researchmap.jp/read0087652