李  斌，  高春彦，  王晨飞
（内蒙古科技大学建筑与土木工程学院，包头014010）

[摘要] 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。
[关键词] 方钢管混凝土；节点；滞回性能；延性；耗能能力

Analysis on Hysteretic Behavior of Steel Beam to Concrete-filled Square Steel Tube Column Connections with Outer Stiffening Ring
Li Bin, Gao Chunyan, Wang Chenfei
( School of Architecture & Civil Engineering, Inner Mongolia University of Science & Technology, Baotou 014010, China)

Abstract: 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 concrete-filled 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.
Keywords: concrete-filled square steel tube; connection; hysteretic behavior; ductility; energy dissipation capacity