Stability Behavior of Perforated Lipped Channel Columns

Abstract

Taking the cold-formed thin-walled perforated lipped channels with simple edge stiffeners and complex edge stiffeners as research objects. The influence of perforated parameters, such as hole width, hole height, hole shape and hole spacing, on axial compressive bearing capacity and buckling mode of these two types of lipped channels were studied by finite element analysis. It shows that the change of hole width, hole shape and hole spacing may change the buckling mode, but influence little on ultimate bearing capacity within a reasonable perforated range; However, it indicates that the ultimate bearing capacity decreased obviously with the opening height increased. The suggestions on reasonable hole shape and hole size were put forward. Furthermore, combined the direct strength method of lipped perforated channels under axial compression abroad with the relevant specification of our country, the direct strength method of lipped perforated channel columns for our country were put forward also. Then, the methods mentioned above were extended to calculate the ultimate bearing capacity of perforated channels with complex edge stiffeners under axial compression, and the validity of the formulas was verified.