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为了研究Z形截面钢筋混凝土柱的抗震性能,对缩尺比为1∶2的9根试件进行了拟静力试验,2根试件进行了单调荷载试验。分析了轴压比(n取0.30、0.45)、加载方向(加载角α为0°、45°、90°、135°)、肢高肢厚比(3∶1、4∶1)、纵筋强度等级(HRB400、HRB500)等参数对其抗震性能的影响。研究了Z形截面柱的破坏特征,得到了试件的荷载-位移滞回曲线及骨架曲线、承载力、位移延性系数等力学性能指标。研究结果表明:试件在横向反复荷载作用下的主要破坏形态为弯曲型破坏,破坏主要发生在与加载方向平行的跨中截面,滞回曲线对称、饱满,试件延性好,具有良好的抗震能力。采用数值分析方法编制了Z形截面柱承载力电算程序进行计算,计算结果与试验结果吻合较好。
In order to study the seismic behavior of reinforced concrete columns with Z-shaped section, nine specimens with a scale ratio of 1: 2 were subjected to quasi-static tests and two specimens were subjected to monotonic loading tests. The axial compression ratio (n = 0.30,0.45), loading direction (loading angle α = 0 °, 45 °, 90 °, 135 °) Intensity level (HRB400, HRB500) and other parameters on its seismic performance. The failure characteristics of Z-shaped cross-section columns are studied, and the load-displacement hysteresis curve, the skeleton curve, bearing capacity and displacement ductility coefficient of the specimen are obtained. The results show that the main failure mode of the specimen under cyclic loading is bending failure. The failure mainly occurs in the mid-section parallel to the loading direction. The hysteresis curve is symmetrical and full. The specimen has good ductility and good anti-vibration ability. The numerical calculation method was used to calculate the bearing capacity of Z-shaped cross-section column. The calculated results are in good agreement with the experimental results.