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


IASS Symposium 2016

SESSION: Computational Methods

Interaction between different instability phenomena in shallow roofing structures affected by geometrical imperfections

< 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: Interaction between different instability phenomena in shallow roofing structures affected by geometrical imperfections
  • Author(s): Fabio Bazzucchi, Amedeo Manuello, Alberto Carpinteri
  • Keywords: snap-through, imperfection sensitivity, coupled instability, reticulated roof, stability domain
Abstract
Instability of equilibrium represents the major issue for the design and the safety of lightweight long-span roofs. Geometrical imperfections may affect the global and local stability of spatial structures. Furthermore, geometric nonlinearity requires different analytical and numerical approaches. The present paper investigates on the interaction between two different instabilities when a structure is affected by a random pattern of geometrical imperfections. To this purpose, the snap-through phenomenon of several shallow latticed roofs was analyzed by a displacement nonlinear analysis. The effect of following parameters was analyzed: internal and the external constraints, slenderness and shallowness ratios. Interaction domains of snap-through vs. Eulerian buckling were obtained. These original domains indicate the prevailing instability collapse mechanism with regards to the structure geometry. The proposed approach provides indications about the maximum tolerable imperfections and actual limit buckling loads of long-span reticulated roofs, according to the interaction between different instability phenomena induced by geometrical imperfections.

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