Study On Load-carrying Performance Of Axially-loaded Short Column Cold-Formed Steel

The current Chinese Specification “Technical Code of Cold-Formed Thin-Wall SteelStructures”（GB50018-2002）prescribes that the section of cold-formed thin-wall steelmembers are simple section and lattice section primarily, but other compound sections lackrelative design method. So in order to verify the suitability of it, it is necessary to carry outrelative experimental and theoretical study on this subject.A total of7cold-formed thin-wall steel stub columns were tested on the axialcompression characteristic. The parameters of columns were sections dimensions,thickness and space of joint plate. The experimental results show that the ultimate failuremode is the local and whole of members related buckling. It is not conservative fordesigning the compression stub column’s ultimate load according to the method in thespecification GB50018-2002. So, through the analysis, according to the effective widthmethod of our country specification to calculate the cold-formed thin-walled steelcombination section members bearing capacity, the correction coefficient to consider boardgroup related situation influencing bearing capacity take account.The effective width method which is widely used in designing cold-formed thin-wallsteel in the world has its shortcoming, another method in the field of cold-formed thin-wallsteel named Direct Strength Design Method (DSM) is introduced in the paper. And theultimate load of the stub columns using DSM and effective width method were calculated.The results show that DSM is more close to the experimental results than effective widthmethod. Then a suggested formula about cold-formed thin-wall steel compound sectionmembers was put forward.Finally, cold-formed thin-walled steel axial compressive short column were simulatedusing ANSYS. ANSYS can determine the elastic buckling and the nonlinear buckling ofmembers. Simulation results are in good agreement with the test results.