Study on the Stress Distribution and Effect of Steel Tube Parameters of TSM Structure

Based on the flexural behavior test of TSM pipe-roof structure, a series of three-dimensional model of TSM verified by laboratory tests was established, and the stress distribution pattern of TSM pipe-roof structure under monotonic static load was investigated, and the effect of two parameters, including steel tube wall thickness and steel tube chord height ratio, on the flexural bearing capacity of the structure. The results show that the TSM pipe-roof structure experienced three working phases: elastic, elastoplastic and plastic during the loading process, and there existed obvious stress concentration at the intersection of steel pipe and connecting steel plate with the increase of load. Besides, the wall thickness and the chord height ratio of the steel tube have significantly improved flexural bearing capacity of the TSM pipe-roof structure. When the wall thickness of steel tube is increased from 4 mm to 8 mm, the maximum flexural capacity of the structure can be increased by 9.09%; with the increase of chord height ratio, the flexural bearing capacity increases first and then decreases, and the optimal chord height ratio is around 3.0. The results of this study are expected to provide a reliable reference for design and application in the novel pipe-roof structures.