Analysis Of Ultimate Bearing Capacity Of The Cold-Formed Thin-Walled C-Steel And The Combined Square Tube Colunm

In the cold-formed steel structures, the initial imperfection, width-thickness, steel strength grade and stiffener of cold-formed thin-walled steel are important factors to the influence ultimate bearing capacity.The cold-formed thin-walled steel combined square tube column is analyzed using ANSYS, the results of the analysis are reliable and sufficiently precise the comparison between the results from numerical simulation and Euler formula. Based on the numerical simulation by using finite element model, influence of initial imperfection, width-thickness, steel strength grade and stiffener of cold-formed thin-walled steel on ultimate bearing capacity is analyzed to find out regularily of ultimate bearing capacity. The results of the analysis by ANSYS indicated that the resistance factors in the cold-formed steel specification is slightly small. Finally, according to the analyses of the cold-formed steel columns with and without stiffener, the section stiffener influence on the cold-formed thin-walled steel combined square tube column and open section cold-formed steel column. It was found that the more width-thickness ratio of section , the more clear influence is on the column capacity.