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


IASS Symposium 2016

SESSION: Metal Spatial Structures

Elasto-plastic seismic response behavior and evaluation of allowable deformation of single layer lattice domes with geometric initial imperfection

< Table of Contents for Metal Spatial Structures
  • Proceedings Name: IASS 2016 Tokyo Symposium: Spatial Structures in the 21st Century
  • ISSN: (Electronic Version) 2518-6582
  • Session: Metal Spatial Structures
  • Pages: 10
  • Title: Elasto-plastic seismic response behavior and evaluation of allowable deformation of single layer lattice domes with geometric initial imperfection
  • Author(s): Tomohiko Kumagai, Daiki Yamana, Toshiyuki Ogawa
  • Keywords: single layer lattice dome, horizontal and vertical earthquake motion, geometric initial imperfection, elasto-plastic dynamic response behavior, collapse acceleration, plastic rotation angle, evaluation of allowable deformation
Abstract
In this paper, the elasto-plastic dynamic response behavior of the single-layer lattice domes with geometric initial imperfection subjected to earthquake motions in the horizontal and vertical directions is investigated by numerical analysis. In addition, the allowable plastic deformation of domes is evaluated by focusing attention on the nodal rotation angles and the rotational angles at center of members. Methods of analyses are a natural vibration analysis and a dynamic response analysis which takes into account the geometrical and material nonlinearities. From the numerical results, it is concluded as follows. 1) The initial yield accelerations of lattice domes with geometric initial imperfections which are similar to the shapes of the predominant vibration modes with short wavelength decrease compared with those of lattice domes without imperfection. 2) The allowable deformation of plastic rotational angles at center of members is evaluated with 0.025rad for the domes in this examination.

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