Experiment and Design Method of Cold-Formed Thin-Walled Steel Unequal-Legged Complex-Lipped Angles Under Axial Compression
To study the buckling behavior and design method of cold-formed thin-walled steel unequal-legged complex-lipped angles(CTSUCAs)under axial compression,24 CTSUCAs with different sections,slenderness ratios and width-to-thickness ratios were tested.The test results showed that the specimens with large slenderness ratio and small width-to-thickness ratio were prone to flexural-torsional buckling,while the specimens with small slenderness ratio and large width-to-thickness ratio were prone to local buckling or interaction buckling of flexural-torsional buckling and local buckling.The buckling modes and load bearing capacities analyzed by the ABAQUS finite element software showed good agreement with the test results,which indicated that the established finite element model is feasible.Then the verified finite element model was used to analyze the CTSUCAs with different slenderness ratios,width ratios of the lip to the leg,and lip forms.The analysis results showed that the ultimate capacity of angle is most obviously affected by the slenderness ratio.The ultimate capacity of angle could be increased by controlling the width ratios of lips to the leg in a certain range or changing the lip forms.The comparison between the test results and the results calculated by direct strength method(DSM)shows that the DSM is unsafe.Finally,based on the experimental and numerical analysis results,the modified DSM is proposed for CTSUCA considering the post-global buckling strength.The comparisons with the experimental and finite element analysis results show that the proposed formulae is accurate and feasible.
万方数据
维普
