双层波纹钢混凝土组合拱静力性能研究

In order to improve the stiffness and load-bearing capacity of traditional corrugated steel arches, a novel type of structure named corrugated steel-concrete-corrugated steel (SCS) arch was proposed, where concrete lays in the two corrugated steel (CS) arches. In this study, the static performance of one SCS arch was experimentally investigated under mid-span loading. The static strength and failure mode of SCS arch were obtained, and were compared with those of the other two types, namely corrugated steel-reinforced concrete arch and reinforced concrete arch. The results show that the ultimate bearing capacity of the SCS arch is higher than that of the other two types for the same steel and concrete, owing to the positive effect of the CS on the moment of inertia and shear resistance. Based on the experimental results, the finite element model was built and verified. Furthermore, the influences of concrete thickness and strength, corrugated steel thickness and strength, connectors on the mechanical properties were analyzed. The finite element analysis results show that the increase of concrete thickness and strength, corrugated steel thickness and strength can improve the ultimate bearing capacity of the SCS arch. Setting inadequate connectors will cause interfacial failure between the CS and concrete, severely reducing the stiffness and ultimate bearing capacity of the SCS arch.