冷弯薄壁复杂卷边槽钢轴压固支构件稳定性能分析

为研究复杂卷边槽钢轴压固支构件的稳定性能,选取不同的翼缘宽厚比、截面形式、构件长度、卷边长度等几何参数,对共计292个构件进行非线性有限元分析,研究上述参数对复杂卷边槽钢固支构件稳定性能的影响。结果表明:固支构件较易发生畸变屈曲,翼缘宽厚比较大时,构件的整体失稳模式多为弯扭屈曲。构件的极限承载力随着翼缘宽厚比、构件长细比的增大而减小,卷边对构件承载效率的影响随翼缘宽厚比的不同而呈现两种不同的规律。

STABILITY BEHAVIOR OF COLD-FORMED THIN-WALLED STEEL FIXED-ENDED CHANNELS WITH COMPLEX EDGE STIFFENERS UNDER AXIAL COMPRESSIVE LOAD

In order to investigate the stability behavior of channels with complex edge stiffeners under axial load between fixed-ends,a total of 292 members with different parameters such as width-to-thickness ratio of flanges,section shapes,length of column,stiffener length were selected to be studied by nonlinear finite element analysis.The influence of the above parameters on stability behavior of channels with complex edge stiffeners were studied.It is shown that fixed-ended columns are more prone to distortional buckling.When width-to-thickness ratio of flanges is big,the overall instability mode tends to perform the flexural-torsional buckling.The ultimate load-carrying capacity of members decreases with the increase in the flange width-to-thickness ratio and slenderness ratio.With differences of width-to-thickness ratio of flanges,two different rules were shown about the influence of edge stiffeners on the load-carrying efficiency of members.