Load-carrying behavior and design method of high-strength thin-walled cold-formed steel roof trusses

Abstract:

In this paper, experiments on three roof truss models made of thin-walled cold-formed steel channel sections with thickness less than 2mm and yield strength over 550Mpa were carried out, and the failure modes and load-carrying capacities of the roof truss structures were investigated. Furthermore, FEM analysis model considering geometry and material non-linearity was established, and non-linear stability analysis was performed on the tested model. It was shown that both failure modes and ultimate load-bearing capacity were consistent with test results. Based on the experiments and numerical analysis, reasonable calculation model for such roof trusses was studied, and the design method for structural members of the trusses were presented according to related national and foreign cold-formed steel structure design codes. Moreover, an improved construction details for strengthening rigidity of the ridge joint plate was also proposed.