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


IASS Symposium 2016

SESSION: Bending Active and Flexible Structures

Simulating Pneumatic Erection of Strained Grid Shells via Dynamic Relaxation

< Table of Contents for Bending Active and Flexible Structures
  • Proceedings Name: IASS 2016 Tokyo Symposium: Spatial Structures in the 21st Century
  • ISSN: (Electronic Version) 2518-6582
  • Session: Bending Active and Flexible Structures
  • Pages: 10
  • Title: Simulating Pneumatic Erection of Strained Grid Shells via Dynamic Relaxation
  • Author(s): Gregory Quinn, Christoph Gengnagel, Kai-Uwe Bletzinger
  • Keywords: pneumatic, falsework, gridshell, dynamic relaxation, Kangaroo2, collosion, membrane
Abstract
The central research question of this work asks 'can pneumatic falsework be used to erect strained grid shells?' In order to begin to answer this question, a bespoke simulation method was developed in the Rhinoceros 3D / Grasshopper software environment making use of the Kangaroo2 Dynamic Relaxation solver alongside substantial customisations using Python and C# programming scripts. A series of 2D mechanically calibrated case studies were conducted which simulate the incremental inflation of a membrane cushion of substantial tensile stiffness but zero bending stiffness in combination (colliding) with a beam featuring significant bending stiffness and relatively low self weight. The method features very low membrane utilisation stresses (up to 35%) and bending stresses climb gradually such that overstressing of the beams is avoided entirely demonstrating the effectiveness of the method. The importance of external and internal tethering cables for restraint and the significance of an initial 'trigger' pressure are highlighted.

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