Inelastic Torsional Buckling Strengths of Cruciform Columns

摘要

The paper presents a theoretical study of the torsional buckling strengths ofcruciform columns. The influences of both initial geometric imperfections and residual stresses are investigated. A non-linear elastic torsion theory based on simple beam-column theory is presented and used for the predictions of the torsional behavior up to first yield. For the behavior beyond the first yield, a nonlinear finite element model is developed which is able to make a complete inelastic load-twist analysis. It is found that both initial twists and residual stresses can significantly reduce the ultimate torsional buckling strengths of cruciform columns.