装配式可退化支撑受力性能分析及试验研究

A prefabricated brace with degenerated bearing capacity is composed of outer tube, inner tube, core plate and restrained component. The degradations of the bearing capacity and mechanical behaviors of the brace were analyzed, and a mechanical model describing the restoring force characteristics of the brace was proposed. By conducting quasi-static reversed cyclic tests on three prefabricated brace specimens with degenerated bearing capacity, the effects of the thickness of core plate on the hysteretic behavior, degradation of bearing capacity and energy dissipation capacity were studied, and the test results were compared with the mechanical model. The test results show that the brace can achieve the degradation of overall bearing capacity through local compression buckling of the core plate under either the compression or tension load. The tensile and compressive bearing capacities of the braces are symmetric, whereas the stiffness and energy dissipation are not symmetric. With the same initial deflection, the relative carrying capacity of the braces increases as the thickness of the core plate increases. The energy dissipation of the braces is caused by the buckling of the core plate, and the energy dissipation capacity increases with the thickness of the core plate. The trilinear restoring force model can effectively reflect the loading carrying mechanism of the brace.