Abstract
According to the composite column of double back to back cold-formed thin-walled C steel connected with gusset plate, the experiment and finite element analysis were carried out to study the stability bearing capacity and failure modes of columns under eccentric loading. The factors such as slenderness ratio, eccentricity, gusset plate thickness and spacing were discussed, which produced the impacts to bearing capacity, and the relationship between stiffness and axial load. The results revealed that the failure modes belonged to the in-plane-flexural buckling and local-buckling of the pressurized flanges and webs of the columns. Slenderness ratio, eccentricity and gusset plate spacing are the major factors that affected the mechanical behavior, while the gusset plate thickness has no obvious impact. In the end, compared with the calculation of the bearing capacity of the cold-formed thin-walled column and GB50018-2002, some suggestions based on this composite column calculation were put forward, and the correction coefficient of bearing capacity of the composite columns were given.
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