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为研究T形钢管混凝土组合柱-钢筋混凝土梁外伸端板连接节点的抗震性能,按1∶2的比例设计并制作9个试件进行低周往复荷载试验,观察试件受力过程和破坏形态,得到试件的滞回曲线和骨架曲线,分析节点的荷载特征值、延性、耗能性能和刚度退化。结果表明:此类节点滞回曲线饱满,延性系数均大于3.48,黏滞阻尼系数均大于1.5,具有良好的抗震性能;增加牛腿长度能提高节点的初始刚度和极限荷载;增加端板厚度和设置加劲肋,节点的极限荷载和耗能性能提高,且加劲肋对薄端板的影响比厚端板显著;增大螺栓直径能提高初始刚度,但对节点承载力影响有限。
In order to study the seismic behavior of the joints of outrigger CFST columns with outrigger end plates, nine specimens were designed and fabricated at a ratio of 1: 2 for low-cycle reciprocating loading tests. The mechanical behavior and failure of the specimens were observed The hysteresis curves and skeleton curves of the specimens were obtained. The load characteristics, ductility, energy dissipation and stiffness degradation of the specimens were analyzed. The results show that the hysteresis curves of these joints are full, the ductility coefficients are all greater than 3.48 and the viscous damping coefficients are all greater than 1.5, which has good seismic performance. Increasing the length of the legs can increase the initial stiffness and ultimate load of the joints. The stiffener is set up, the ultimate load and energy dissipation performance of the joint are improved, and the effect of the stiffener on the thin end plate is more significant than that of the thick end plate. Increasing the bolt diameter can improve the initial stiffness but has a limited impact on the joint bearing capacity.