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1998 Fiscal Year Final Research Report Summary

Parallel design of architectural structures based on multidisciplinary optimization technique

Research Project

Project/Area Number 09450207
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Building structures/materials
Research InstitutionKYOTO UNIVERSITY

Principal Investigator

OHSAKI Makoto  Kyoto University, Dept.Architecture an Architectural Systems, Assoc.Prof., 工学研究科, 助教授 (40176855)

Co-Investigator(Kenkyū-buntansha) TAGAWA Hiroshi  Kyoto University, Dept.Architecture and Architectural Systems, Research Assoc., 工学研究科, 助手 (70283629)
TSUJI Masaaki  Kyoto Inst.of Technology, Dept.Architecture and Design, Research Associates, 工芸学部, 助手 (00243121)
KATOH Naoki  Kyoto University, Dept.Architecture an Architectural Systems, Prof., 工学研究科, 教授 (40145826)
Project Period (FY) 1997 – 1998
KeywordsOptimum design / Parametric optimization / Parallel optimization / Truss / Membrane Structure / Building Frame
Research Abstract

1. The multiobjective optimization problem of a truss is divided into shape design and stiffness design, and a parametric optimization method has been presented for finding the design that minimizes the dissatisfaction level of a truss which is defined in terms of the response quantities and the total structural volume.
2. A two-leven method has been presented for finding the optimal initial shape and stresses of a membrane structure. The objective function is the compliance (external work) under given loading conditions. In the first level problem, the optimal stresses are found that minimizes the deviation from the target distribution under the explicit conditions for the curved surface to be reduces to a set of plane sheets. In the second level problem, the compliance is further reduced by varying the initial shape. Since the optimal stresses in the first stage are found by solving a set of simultaneous linear equations only one at each iterative step, the proposed method is effectively used for a large membrane structure.
3. Parametric forms of metrics of fairness or roundness of the curves and surfaces have been defined, and a design method has been presented for finding smooth curves and surfaces of a ribbed shell.
4. A parallel optimization method has been presented for a 3d-frame. The frame is divided into plane frames of which beams are optimized independently while the stiffnesses of the columns are fixed. Then the stiffness of the columns are varied based on the parametric optimization techniques. In the proposed method, the computational cost depends mainly on the size of each plane frame. Therefore the method is successfully applied for optimizing large 3d-frames.

  • Research Products

    (10 results)

All Other

All Publications (10 results)

  • [Publications] M.Ohsaki: "Shape optinization of a dowble-layer Space truss described by a parametric surface" Int.J.Space Structures. 12(2). 109-119 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 大崎 純: "膜構造物の静的載荷時の剛性を考慮した初期応力裁断膜形状最適化" 膜構造研究論文集. 11. 31-38 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Osaki: "Space-size optimization of plane trisses with designeds preference." J.Struct.Engng.ASCE. 124. 1323-1330 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Ohsaki: "Interactive multi Objeclive two-level optimization of dissa faction level of structures" Proc.7th HAA/VSAF/HASA/ISSMO Symposium of Multidisciplinary Analysis and optimization. 97-106 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 大崎 純: "複合領域最適化手法によるトラスの形状設計法" 日本建築学会近畿支部研究報告集. 37(構造). 369-372 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Ohsaki: "Shape optimization of a double-layer space truss described by a parametric surface" Int.J.Space Structures. Vol.12(2). 109-119 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Ohsaki: "Optimization of initial stresses and cutting patterns of membrane structures considering stiffness under static loads" Research Report on Membrane Structures. No.11. 31-38 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Ohsaki: "Shape-Size optimization of plane trusses with designer's preference" J.Struct.Engng., ASCE. Vol.124, No.11. 1323-1330 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Ohsaki: "Interactive multiobjective two-level optimization of dissatisfaction level of structures" Proc.Seventh AIAA/USAF/NASA/ISSMO Symposium on Multidisciplinary Analysis and Optimization, AIAA. 97-106 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Ohsaki: "Shape design of trusses by using multi-disciplinary optimization method" Research Report, Kinki Branch of AIJ. 369-372 (1997)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1999-12-08  

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