Experiments were carried out on three roof truss models which were made of thin-walled cold-formed steel channel sections with thickness less than 2 mm and the yield strength over 550 MPa to investigate the failure modes and load-carrying capacities of the roof truss structures. Furthermore, a finite element method analysis model was established by taking the geometry and material non-linearity into consideration, and a non-linear stability analysis was made on the tested model. Both failure modes and ultimate load-bearing capacity were consistent with test results. Based on the experiments and numerical analysis, reasonable calculation model for estimating the load-carrying capacity of such roof trusses was studied, and the design method for structural members of the trusses was presented. Finally, an improved construction details for strengthening rigidity of the ridge joint plate was also proposed.
