THE INELASTIC BEHAVIOR OF PERFORATED SECTIONS UNDER AXIAL COMPRESSION

摘要

A recently developed inelastic large displacement isoparametric spline finite strip method was used to investigate the inelastic stress distributions, load transfers and failure modes for a range of hole shapes, sizes and spacings. While such study is available for elastic material behaviour, the influence of yielding on the load transfers in and failure modes of perforated sections is not well understood. The study considered typical cold-formed structural sections subjected to local buckling and uniform compression. Several inelastic material models were included in the study, including an elastic-perfectly plastic model and a model with nonlinear yielding and isotropic hardening. Comparisons were made with elastic analyses and conclusions were drawn about the influence of yielding and strain hardening on the stress distributions, load transfers and failure modes of typical thin-walled metallic structural sections.