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以型钢延伸高度、配钢率、轴压比以及不同构造措施等为设计参数,对21个SRC-RC转换柱试件和1个钢筋混凝土柱对比试件采用“建研式”加载设备进行了低周反复荷载试验。研究SRC-RC转换柱的滞回曲线、骨架曲线、承载力、变形能力、位移延性系数及耗能能力等抗震性能。试验结果表明:SRC-RC转换柱的破坏形式有剪切破坏、弯曲破坏和粘结破坏,其中剪切破坏多发生于柱的顶部;21个转换柱试件的位移延性系数介于1.97与5.99之间,试件的延性受到型钢延伸高度、配钢率、轴压比及配箍率等诸多因素影响,抗震性能相差较大。采用箍筋加密措施并适当增加型钢延伸高度的SRC-RC转换柱试件的承载能力和变形能力均好于同条件下的钢筋混凝土柱,可以推广应用于高层建筑中。
Taking the extension of section steel, steel ratio, axial compression ratio and different structural measures as design parameters, 21 SRC-RC columns and 1 reinforced concrete column were compared with “R & D-style” loading equipment Low-cycle repeated load test. The seismic performance of SRC-RC column is studied, such as hysteresis curve, skeleton curve, bearing capacity, deformation capacity, displacement ductility coefficient and energy dissipation capacity. The experimental results show that the failure modes of SRC-RC column are shear failure, bending failure and bond failure, of which the shear failure mostly occurs at the top of the column. The displacement ductility coefficients of 21 columns are between 1.97 and 5.99 , The ductility of the specimen is affected by many factors, such as the extension height of the section steel, the steel ratio, the axial compression ratio and the stirrup ratio, and the seismic performance is greatly different. The load-carrying capacity and deformation capacity of SRC-RC columns with stirrups reinforcement measures and appropriate extension of profiled sections are better than that of reinforced concrete columns under the same conditions and can be widely used in high-rise buildings.