L形钢管混凝土柱-H型钢梁Z字形拼接节点抗震性能研究

Seismic behavior of Z-shaped splicing joint between concrete-filled L-shaped steel tubular column and H-section beam

研究了一种L形钢管混凝土柱-H型钢梁Z字形拼接节点的抗震性能,包括翼缘和腹板均拼接的节点和设置上、下部翼缘加劲肋替代腹板处拼接板的节点。通过对节点的拟静力试验和研究,获得了节点的滞回曲线、滑移荷载、屈服荷载、极限荷载、耗能能力、延性与刚度退化规律,分析腹板处拼接板和翼缘加劲肋对节点抗震性能的影响。研究结果表明:腹板处拼接板可以提高节点的屈服荷载和极限荷载。增加翼缘高强螺栓数量可以提高节点的滑移荷载,但会降低节点的延性性能。垂直加劲肋可以提高节点的屈服荷载、极限荷载和延性。对比有无上、下翼缘加劲肋的两组节点可知,上、下翼缘加劲肋可以提高节点的承载能力,有效传递拼接区的剪力,可代替腹板连接,该节点具有良好的延性和塑性转动能力。

The seismic performance of a Z-shaped splicing joint between concrete-filled L-shaped steel tubular column and H-section beam was studied,including joints with splicing flanges and webs,and joints with upper and lower flange stiffeners instead of splicing plates at the webs.Through the pseudo-static test and research on the joints,the hysteresis curve,slip load,yield load,peak load,energy consumption capacity,ductility and stiffness degradation law were obtained,and the effects of splicing plates and flange stiffeners at the web on the seismic performance of joint was analyzed.The research results show that the web splice plate can improve the yield load and peak load of the joint.Increasing the number of flange high-strength bolts can improve the joint′s slip load,but it will reduce the ductility performance.The vertical stiffener can increase the yield load,peak load and ductility of the joint.Comparing the two sets of joint with or without upper and lower flange stiffeners,it can be seen that the upper and lower flange stiffeners can improve the bearing capacity of the joint,effectively transmit the shear force in the splicing area,and can replace the web connection.The joints have good ductility and plastic rotation capacity.