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


IASS Symposium 2016

SESSION: Computational Methods

Form finding of cable nets for retractable membrane roofs

< Table of Contents for Computational Methods
  • Proceedings Name: IASS 2016 Tokyo Symposium: Spatial Structures in the 21st Century
  • ISSN: (Electronic Version) 2518-6582
  • Session: Computational Methods
  • Pages: 10
  • Title: Form finding of cable nets for retractable membrane roofs
  • Author(s): Hiroki Tamai
  • Keywords: form finding, membrane, retractable roof, membrane folding, optimization
Abstract
When a retractable membrane system is incorporated with a cable structure, and the cables are used as the tracks along which the membrane is pulled and folded, the form finding of the cable structure needs to satisfy not only equilibrium but also a number of geometric constraints that allow the fold of the membrane. This paper discusses a sufficient condition for the structural membrane to fold and unfold without tearing between the track cables, and demonstrates cable net form finding under this condition. The cable forces are also determined to reduce the variation of cable force while maintaining a doubly curved surface. The numeric examples, including the canceled roof design for New National Stadium Japan for Tokyo Olympic 2020, demonstrate that the equilibrium configuration of a cable net can be used to visualize the membrane's foldability; new equilibrium structural forms with new architectural values can be generated.

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