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


IASS Symposium 2016

SESSION: Tension & Membrane Structures

In-situ determination of stress and strain distributions of inflatable membrane structure based on photogrammetry

< Table of Contents for Tension & Membrane Structures
  • Proceedings Name: IASS 2016 Tokyo Symposium: Spatial Structures in the 21st Century
  • ISSN: (Electronic Version) 2518-6582
  • Session: Tension & Membrane Structures
  • Pages: 10
  • Title: In-situ determination of stress and strain distributions of inflatable membrane structure based on photogrammetry
  • Author(s): Bing Zhao, Wujun Chen, Jianhui Hu, Chengjun Gao
  • Keywords: inflatable membrane structure, in-situ determination, strain and stress distributions, photogrammetry
Abstract
This paper presents an in-situ method to determine strain and stress distributions of inflatable membrane structure using photogrammetry. Firstly, dynamic shape of the target inflatable membrane structure can be obtained following photogrammetric procedure. Secondly, based on 3D coordinates of measured points before and after deformations, strain distribution can be calculated from the deformations of triangular elements. Thirdly, based on the measured geometrical shape and internal pressure, stress distribution can be determined on the equilibrium of inflated pressure and film internal force using force finding method, after simplifying it to a membrane link structure with external forces on connection nodes. To validate the proposed method, the strain and stress distributions of an ETFE (ethylene-tetrafluoroethylene) cushion model are evaluated. The acceptable agreement between experimental and numerical results demonstrates that the proposed method is suitable for determining strain and stress distributions of inflatable membrane structure under service condition.

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