两层两跨方钢管混凝土框架抗震性能试验研究

Experimental research on seismic behavior of two-story two-bay concrete filled square steel tube columns frame

为了研究采用穿芯高强螺栓-端板节点的方钢管混凝土框架的抗震性能,对一榀两层两跨的方钢管混凝土柱-钢梁框架进行了竖向荷载和低周反复水平荷载作用下的抗震性能试验研究,观测了框架的破坏形态,得到了框架试件的荷载-位移滞回曲线、骨架曲线,分析了方钢管混凝土框架的破坏机制、滞回性能、延性、耗能能力、强度及刚度退化等力学性能。结果表明：框架试件基本实现了梁铰破坏机制,具有良好的变形性能和耗能能力,位移延性系数为5.86～6.42,等效黏滞阻尼系数达到0.454,均满足延性框架的抗震要求。框架试件的强度和刚度退化较为平缓,具有较强的抗侧移能力。

In order to investigate the seismic behavior of concrete filled square steel tube columns frame,which uses the through high strength bolts-endplate connection,an experimental study of the concrete filled square steel tube columns and steel beams frame is performed under static vertical loads and low cyclic horizontal reversed loads.The failure condition of the experimental frame is observed.The load-displacement hysteretic loops and skeleton curve of tested frame are obtained.The failure mechanism,hysteretic behavior,ductility,energy dissipation capacity,strength and stiffness degeneration are investigated.The results indicate that the beam hinge failure mechanism is achieved.The frame specimen exhibits excellent deformation capacity and energy dissipation capacity.The displacement ductility coefficient is 5.86～6.42,and the coefficient of equivalent viscous damping reachs 0.454.These meet the requirements for seismic design of ductility frame.The strength and stiffness degenerates gradually,which shows that the experimental frame has substantial lateral displacement resisting capacity.