钢筋混凝土Z形截面柱框架节点抗震性能试验研究

为了研究钢筋混凝土Z形截面柱框架节点的抗震性能，进行了8榀缩尺比为1∶2的Z形柱中间层节点的低周反复加载试验，得到了节点试件的破坏模式、滞回曲线和骨架曲线，以及受剪承载力和延性系数等用以评价节点抗震性能的主要参数。将试验得到的承载力与规程公式计算结果进行比较，结果表明Z形截面柱节点的承载力可按两个L形截面柱节点的承载力公式计算，计算结果和试验结果吻合较好。分析了轴压比、节点的配箍特征值、剪压比和Z形柱肢高肢厚比等试验参数对节点的抗震性能的影响，分析表明剪压比是Z形截面柱节点延性的最主要影响因素，剪压比小的节点试件具有良好的位移延性和滞回特性，而肢高肢厚比对节点的延性影响不大。

Experimental research on seismic behavior of Z-shaped column joints in RC frame

To study the seismic performance of Z-shaped section column joints in RC frame,cyclic loading tests were carried out on eight 1/2-scale interior joints with Z-shaped columns.Failure modes,hysteretic carves and skeleton curves of the joints were obtained,and the main parameters for estimating the earthquake resistant behavior of the joints were also studied,such as shearing capacity and ductility of the joints.The values of the load-bearing capacities of specimens were compared with those calculated from formula present in existing specification.The results show that the shearing capacity of Z-shaped section column joint may be perdicted using the formula of the two L-shaped column joints.The analytical results are in good agreement with experiments.The experiment parameters affecting the seismic behavior of the joints,including the axial compression ratio,the amount of the joint stirrup,shear compression ratio and ratio of pier length to pier thickness were analyzed.It is shown that the ratio of shear compression is the most important factor for the ductility.The smaller shear compression ratio of joints have good displacement ductility and hysteretic behavior.The pier length to pier thickness ratio has a little effect on the ductility.