新型T形钢管混凝土柱-钢梁节点抗震性能研究

Research on the seismic performance of new T-shaped concrete-filled steel tube column-steel beam joint

基于已有的异形钢管混凝土-钢梁节点,提出并设计了带侧板连接新型T形钢管混凝土柱-钢梁节点。通过拟静力加载试验,系统分析了新型T形钢管混凝土柱-钢梁节点的受力机理及抗震性能,分析了节点的滞回曲线、骨架曲线、承载能力等各项抗震指标。同时探讨了在低周反复荷载作用下,节点破坏特征及抗震性能。结果表明:随着荷载的增加,节点在屈服以后能够产生较强的耗能能力,具有良好的抗震性能。同时由于侧板的设置,使得塑性铰出现在钢梁上,形成梁铰破坏机制,满足建筑结构所要求的“强柱弱梁,强节点弱构件”的抗震设计。

Based on the existing special-shaped concrete-filled steel tube(CFST)column-steel beam joints,a new T-shaped CFST column-steel beam joints with side plates were proposed and designed.Through the pseudo-static loading test,the mechanical mechanism and seismic performance of the new T-shaped CFST column-steel beam joints were systematically analyzed,and the hysteretic curve,skeleton curve,bearing capacity and other seismic indexes of the joints were analyzed.At the same time,the failure characteristics and seismic performance of joints under low cycle repeated loads were discussed.The results show that with the increase of load,the joints can produce strong energy dissipation capacity after yielding,and have good seismic performance.Moreover,due to the setting of side plate,plastic hinge appears on the steel beam,forming the beam hinge failure mechanism,which meets the seismic design requirements of"strong column and weak beam,strong joint and weak component".