Stress and Deformation Analysis of Membrane Structures Considering Material Nonlinearities - Comparison of Fabric Lattice Model with Orthotropic Elastic Model -

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Publication year 1996
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Title Stress and Deformation Analysis of Membrane Structures Considering Material Nonlinearities - Comparison of Fabric Lattice Model with Orthotropic Elastic Model -
Author Shiro Kato,Tatsuya Yoshino
Summary Numerical analyses are performed to a HP membrane fabric roof with initial stresses under Loading and unloading of snow. Two constitutive equations are adopted in the analyses to make a comparison among the analytical results through them: one is based on an ordinary orthotropic elastic model; another one is a fabric lattice model considering material nonlinearities and crimp interchanges. Numerical analyses were done by eight-node FEM for curved membranes considering initial stresses and geometrical nonlinearities. The result reveals that the stresses under snow load obtained from both methods are relatively compatible. HoweverEŒthe differences of stresses after unloading appeared so large in case of low initial stresses. This is because only geometrical nonlinearities can be considered in using the orthotropic elastic modelEŒwhile neither the material plasticities nor crimp interchanges can.