矩形钢管混凝土框架节点的拟静力试验研究

Quasi-static experimental research for concrete-filled rectangular steel tubular frame joints

完成了四个矩形钢管混凝土框架节点（外加强环）模型的拟静力试验。研究表明：矩形钢管混凝土框架节点滞回曲线饱满，耗能能力强；达到极限荷载后具有良好的延性和稳定的后期承载能力，位移延性系数在3．5—4．76之间，满足延性节点的要求，具有较好的受力性能和抗震能力。梁柱线刚度比较大的试件具有较高的承载力和弹性阶段刚度，增大轴压比对试件的弹性刚度影响不大，但随着轴压比的增加，试件的后期变形能力有减小的趋势。

The quasi-static test of four concrete-filled rectangular steel tubular（CFRST） frame joint（exterior stiffened ring） models were finished. The results indicate that the CFRST frame joints have plump hysteretic loops, stronger energy dissipation capacity, better ductility and steady late load-carry capacity after the joints reach ultimate loads, the ductility coefficient is between 3.5 and 4.48, the joints can meet the requirement of ductile joint, and have superior mechanical behavior and seismic capacity. The specimen whose beam-column linear stiffness level is higher has higher load-carrying capacity and elastic stiffness, the increase of axial load level has little effect on the elastic stiffness, but with the augment of the axial load level, the late deformation ability will minish.