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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。
In order to study the seismic behavior of reinforced concrete members with Z-shaped cross-section columns and columns, a low-cycle repeated loading test was carried out on the Z-shaped column interlayer joints with a 1/2 scale ratio of 8 榀. The failure modes, Curves and skeleton curves, as well as the main parameters used to evaluate the seismic performance of joints, such as the shear capacity and ductility factor. The results of bearing capacity calculated by test and formula of formula are compared. The results show that the bearing capacity of Z-shaped column nodes can be calculated according to the bearing capacity formula of two L-shaped column nodes. The calculated results are in good agreement with the experimental results. The influence of experimental parameters such as axial compression ratio, bifurcation characteristic value, shear-compression ratio and Z-shaped limb height to thickness ratio on the seismic performance of the joints were analyzed. The results showed that the shear-compression ratio was the most ductile The main influencing factors, the specimen with small shear-pressure ratio had good displacement ductility and hysteretic behavior, while the limb height-thickness ratio had little effect on the ductility of the joints.