不同厚度的冷弯薄壁型钢C型柱屈曲承载性能

BUCKLING BEHAVIOR OF COLD-FORMED THIN-WALLED STEEL C-COLUMNS WITH DIFFERENT THICKNESS

采用ABAQUS有限元软件,对冷弯薄壁型钢C型截面柱屈曲性能进行数值模拟,分析截面厚度对相同用钢量、不同截面形式的试件屈曲承载力及屈曲破坏模式的影响,把数值分析结果与直接强度法(DSM)计算的屈曲承载力进行对比。结果表明试件破坏模式均为畸变屈曲,随着试件厚度的增大,其屈曲承载力逐渐增大。在板厚t>3.8mm时,宜做成二次卷边形试件;在板厚t≤3.8mm时,将试件加工成腹板加劲形试件且加劲个数为1为宜。文中的研究为冷弯薄壁型钢C型截面柱工程设计提供参考。

The buckling behavior of cold-formed thin-walled steel C-section columns is numerically simulated by ABAQUS finite element software.The effectiveness of section thickness on the buckling capacity and buckling fail-ure mode of specimens with the same steel consumption and different section forms are analyzed.The numerical analysis results are compared to the buckling capacity results calculated by Direct Strength Method(DSM).The re-sults show that the failure modes of specimens are distortional buckling,and the buckling capacity increases gradual-ly with the increase of specimen thickness.It is appropriate for the specimens to be made into the secondary edge shape when the plate thickness t>3.8mm,and the specimens are processed into web-stiffened specimens with the number of stiffeners being 1 when the plate thickness t≤3.8mm.The research in this paper may provide reference for engineering design of cold-formed thin-walled steel C-section columns.