Interaction behavior of fixed ended cold-formed steel unequal lipped angle columns

Studies on post-global flexural–torsional buckling strength and global–global interaction between flexural–torsional and flexural buckling modes in cold-formed steel equal-lipped angle columns have been reported in the literature. Similar global–global interaction involving the first two modes of flexural–torsional buckling in unequal-lipped angles has not yet been explored. In this study, a total of 11 cold-formed unequal lipped angle specimens having two different ranges of ratios of elastic flexural–torsional buckling loads (Pcrft2/Pcrft124), indicating high and low interaction of flexural–torsional buckling modes, were tested under axial compression. Additionally, test results from the literature for specimens having 5