屈曲约束支撑装配式钢管混凝土组合框架抗震试验性能研究

屈曲约束支撑可以有效地提高装配式钢管混凝土组合框架的抗侧移刚度和耗能减震作用。为研究地震作用下屈曲约束支撑装配式钢管混凝土组合框架的抗震性能和破坏机理，进行两层单跨屈曲约束支撑单边螺栓端板连接钢管混凝土组合框架的水平低周反复荷载试验。考察柱截面类型和端板形式对结构整体抗震性能的影响。记录和研究了此类混合结构的破坏形式和水平荷载-水平位移滞回曲线，分析和评价其骨架曲线、强度和刚度退化规律、延性和耗能等。试验研究表明，在柱截面含钢率相同条件下，抗侧移体系采用屈曲约束支撑，梁柱连接采用单边螺栓端板连接方式，屈曲约束支撑方钢管混凝土组合框架的水平承载力和初始抗侧刚度大于屈曲约束支撑圆钢管混凝土组合框架，但是其延性和耗能能力反之。试验和分析结果表明：屈曲约束支撑装配式钢管混凝土组合框架结构具有良好的抗震性能，较大的可变形能力和耗能能力，可以在多高层建筑结构中应用和推广。

Experimental study on seismic behavior of assembly CFST composite frames with bucking restrained braces

The bucking restrained braces (BRBs) could effectively improve the lateral stiffness and energy dissipation of the assembly concrete-filled steel tubular (CFST) composite frames. To study the failure mechanism and seismic performance of the assembly CFST frame with BRBs, two second-story one-span specimens with blind bolted endplate connections were tested under the lateral cyclic loading. The effects of column cross-section type and the endplate type on the seismic behavior of the whole structure were inspected. The failure mode and hysteretic curves were investigated in detail. Skeleton curves, strength and stiffness degradation, ductility and energy dissipation were also analyzed. The test results show that at the same steel ratio of the column section, the ultimate bearing capacity and initial stiffness of square CFST frame with BRBs are higher than those of circular CFST frame with BRBs. While the ductility coefficient and the energy dissipation capacity are on the contrary. The results of test and analysis show that the assembly CFST frame with BRBs has excellent seismic performance, ductility and energy dissipation capacity, so they can be applied and promoted in multilayer and high-rise composite structure buildings.