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IASS 2016 Tokyo Symposium: Spatial Structures in the 21st Century


IASS Symposium 2016

SESSION: Form Finding & Optimization

Structural morphogenesis for asymmetric free-form grid shell Using NURBS with manipulation of decent solutions search

< Table of Contents for Form Finding & Optimization
  • Proceedings Name: IASS 2016 Tokyo Symposium: Spatial Structures in the 21st Century
  • ISSN: (Electronic Version) 2518-6582
  • Session: Form Finding & Optimization
  • Pages: 10
  • Title: Structural morphogenesis for asymmetric free-form grid shell Using NURBS with manipulation of decent solutions search
  • Author(s): Yusuke Okita, Toshio Honma
  • Keywords: structural morphogenesis, genetic algorithms (GA), diversity of solution, decent solutions, free-form grid shell, NURBS
Abstract
This study presents the effectiveness of a structural morphogenesis for free-form grid shells with manipulation of decent solutions search. The decent solutions are composed by the solutions of comparatively high evaluation containing a global optimal solution and local optimal solutions. The use of the decent solutions satisfying a structural rationality will stimulate designer's ideas. In this paper, the genetic algorithm with immune system (ISGA) to obtain the decent solutions is applied to a structural morphogenesis for an asymmetric free-form grid shell. The curved shape decision and the member selection for the grid shell are described with NURBS representation. The obtained forms in the structural morphogenesis for the grid shell are influenced by the order of NURBS. Especially in decent solutions search, it is important to understand this influence. The property and the influence for the order of NURBS on decent solutions search with geometric constraint are clarified from numerical results.

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