方钢管混凝土柱-钢梁外加强环节点滞回性能分析

Analysis on Hysteretic Behavior of Steel Beam to Concrete-filled Square Steel Tube Column Connections with Outer Stiffening Ring

为了研究方钢管混凝土柱-钢梁外加强环节点的抗震性能,进行了四个方钢管混凝土柱-钢梁外加强环节点的低周反复荷载试验,以轴压比和梁柱线刚度比为参数,研究分析了该类节点的滞回曲线、延性、刚度退化、耗能能力及其破坏特征。结论表明:方钢管混凝土柱-钢梁外加强环节点滞回曲线饱满,耗能能力强,刚度退化缓慢,达到极限荷载后具有良好的延性和后期承载能力。经与钢筋混凝土框架、型钢混凝土框架及钢框架节点比较可知,方钢管混凝土柱-钢梁外加强环节点具有较好的受力性能和抗震能力,本文的研究成果可用于指导钢管混凝土结构的工程实践。

To understand the seismic behavior of steel beam to concrete-filled square steel tube column connections with outer stiffening ring,through the low cyclic load test of four steel beam to concrete-filled square steel tube column connections with outer stiffening ring,considering the effect on the axial compression ratio and beam-column linear stiffness ratio,the hysteretic curve,ductility,degradation of stiffness,energy dissipation capacity,failure mechanism and characteristics were researched.The results indicate that the steel beam to concrete-filled square steel tube column connections with outer stiffening ring has plum physteretic loops,stronger energy dissipation capacity,slow stiffness degradation,better ductility and steady late load-carrying capacity after the joints reach ultimate loads.Compared with reinforced concrete frame joints,steel reinforced concrete frame joints and steel frame joints,the steel beam to concretefilled square steel tube column connections with outer stiffening ring has superior mechanical behavior and seismic capacity, the research fruits can direct the engineering practice of concrete-filled steel tube structure.