DIRECT STRENGTH METHOD STUDY ON BEARING CAPACITY CALCULATION OF CHANNEL COLUMNS WITH INCLINED SIMPLE EDGE STIFFENERS UNDER AXIAL COMPRESSION

In order to investigate the bearing capacity calculation method of channel columns with inclined simple edge stiffeners under axial compression and develop the application of the direct strength method (DSM) in our country, revised DSM formulas which are based on analysis of the current DSM formulas abroad and combined with the actual situation of our country were presented for calculating the ultimate load-carrying capacity of concentrically loaded channels with inclined simple edge stiffeners between pinned ends and fixed ends respectively. A mass of finite element analysis results verified by tests were used to establish the formulas. The revised method considered local and overall interaction buckling, distortional and overall interaction buckling. By comparing the results from the revised DSM formulas with those from the tests and the codes including North American specification (NAS 2001), American Iron and Steel Institute specification (AISI 1996) and Australia standards (AS/NZS 4600), it is found that the revised DSM formulas can provide more accurate prediction of the bearing capacity and buckling modes of channel columns with inclined simple edge stiffeners than the current DSM formulas and the above codes.