矩形钢管混凝土框架节点抗震性能试验研究

通过三个矩形钢管混凝土框架节点(外加强环)模型的拟静力试验,以轴压比和梁柱线刚度比为参数,研究了该类框架节点的滞回曲线、延性、强度与刚度退化、耗能能力及其破坏特征。结论表明:矩形钢管混凝土框架节点滞回曲线呈饱满的"梭形",耗能能力强;强度与刚度退化缓慢;在达到极限荷载后具有良好的延性和后期变形能力,位移延性系数在3.5~4.48之间,满足延性节点的要求。经与钢筋混凝土框架、组合结构框架及钢框架节点抗震性能比较,可知:全钢管混凝土框架节点具有较好的受力性能和抗震能力,该文的研究成果可用于指导钢管混凝土结构的工程实践。

EXPERIMENTAL RESEARCH OF ASEISMIC BEHAVIOR FOR CONCRETE-FILLED RECTANGULAR STEEL TUBULAR FRAME JOINTS

Through quasi-static test of three concrete-filled rectangular steel tubular (CFRST) frame joint (exterior stiffened ring) models, the parameters include the axial load level and beam-column linear stiffness level, the hysteretic curve, ductility, degradation of strength and stiffness , failure mechanism and characteristics are researched. The results indicate that the CFRST frame joints has plump hysteretic loops, stronger energy dissipation capacity, slower strength and stiffness degradation, better ductility and late deformation ability after the joints reach ultimate loads, the ductility coefficient is between 3.5 and 4.48,the joint can meet the requirement of ductile joint. Compared with reinforced concrete frame joints, composite structure frame joints, steel frame joints, the CFRST frame joints has superior mechanical behavior and aseismic capacity; the research fruits can direct the engineering practice of concrete-filled steel tube structure.