Theoretical Investigation of the Column Behaviour of Cold-Formed Square Hollow Sections

摘要

A large deflection elastic-plastic analysis has been developed and is used to investigate the column behavior of Australian produced cold-formed square hollow sections. The analysis can account for plate geometric imperfections, the variation of yield stress around a section, the stress-strain characteristics of the material forming the section and the highly complex patterns of residual stress produced by the cold forming process. Stub and pin-ended column tests were performed and detailed measurements of yield stress and residual stress taken. The finite strip analysis including these distributions of yield stress and residual stress is used in this report to investigate the behavior of the stub and pin-ended columns. In particular, the influence of the measured through thickness residual stress components on the ultimate load and behavior of the SHS columns is demonstrated.