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为了探讨钢筋混凝土(RC)梁-钢管混凝土柱框架的抗震性能,进行一榀单跨两层RC梁-钢管混凝土柱框架的拟静力试验,对结构的破坏形态、破坏机制、滞回曲线、骨架曲线、位移延性、刚度退化、耗能能力等性能进行了研究。试验结果表明:RC梁-钢管混凝土柱框架滞回曲线比较饱满;框架在低周反复荷载下,承载力较高,变形能力和耗能能力较强;正向和反向的位移延性系数分别达到9.5和6.8;在反复荷载作用下,框架的水平刚度(割线刚度)随着位移循环次数的增加而降低,模型框架的割线刚度在荷载达到最大后下降变缓;框架的强度随着位移的循环次数的增加降低不大;当梁端出现塑性铰时钢管工作状态良好。
In order to investigate the seismic behavior of reinforced concrete (RC) beam-CFST columns, the pseudo-static test of single RC two-story RC-CFST columns is carried out. The failure modes, failure mechanism, Skeleton curve, displacement ductility, stiffness degradation, energy dissipation capacity and other properties were studied. The experimental results show that the hysteretic curves of RC beam-concrete filled steel tubular columns are quite full. Under cyclic low-cycle loading, the frame has higher bearing capacity, stronger deformability and energy dissipation capacity, and the displacement ductility coefficients of forward and reverse directions reach 9.5 and 6.8, respectively. Under repeated loading, the horizontal stiffness (secant stiffness) of the frame decreases with the increase of the number of displacement cycles. The secant stiffness of the model frame decreases slowly when the load reaches the maximum value. The strength of the frame decreases with displacement Of the increase in the number of cycles is not reduced; when the plastic hinge at the end of the beam when the steel working in good condition.