Unified Theory for Collapse of Thin Rectangular Tubes under Compression

摘要

In the present paper, the elasto-plastic buckling behavior of thin-walled rectangular tubes under compression is analyzed. The stress-strain relations of the panels of the tube are assumed nonlinear and the plastic buckling load of the panel is considered as the collapsing load of the tube. Applying the plasticity reduction factor, a single formula for the crushing strength of rectangular tubes in wide ranges of thickness to width ratio may be derived. The present theory is in good agreement with the experimental results for various thickness to width ratios and materials.