矩形钢管混凝土框架节点与其他节点的比较研究

THE COMPARISON BETWEEN THE CONCRETE-FILLED RECTANGULAR STEEL TUBULAR FRAME JOINTS AND OTHER JOINTS

通过3个全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、破坏机理及其破坏特征,考察了轴压比、梁柱线刚度比等参数对节点受力性能的影响规律。结论表明:全矩形钢管混凝土框架节点的滞回曲线饱满,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,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的比较可知,全钢管混凝土框架节点具有较好的受力性能和抗震能力,研究成果可用于指导钢管混凝土结构的工程实践。

Through quasi-static test of three concrete-filled rectangular steel tubular(CFRST)frame joint(exterior stiffened ring) models,taking the axial compression ratio and beam-column linear stiffness ratio as parameters,the hysteretic curve,ductility,degradation of strength and stiffness,failure mechanism and characteristics are researched,the influence of the axial compression ratio and beam-column linear stiffness ratio on mechanical behavior of joint is studied.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 joint can meet the requirement of ductile joint.As compared with reinforced concrete frame joints,composite structure frame joints,steel frame joints,the CFRST frame joints have superior mechanical behavior and seismic capacity,the research fruits can direct the engineering practice of concrete filled steel tube structure.