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对18个T形钢管混凝土柱-混凝土梁外加强环板式节点采用有限元与正交试验法相结合的方式进行抗震性能研究。结果表明,节点的裂缝发展经历初裂、通裂、极限、破坏四个过程;牛腿在梁端荷载的传递过程中起到桥梁作用;最终以牛腿与梁交界处形成塑性铰而破坏,符合“强节点弱构件”的抗震设计思想。对节点极限承载力、位移延性系数以及能量耗散系数三个性能指标影响最为显著的因素均为框架梁配筋率。框架梁混凝土强度等级的提高可以提高节点极限承载力,但是增幅过大不利于节点抗震性能,所以工程设计时应合理地选择框架梁混凝土强度等级。
The seismic behavior of 18 T-shaped CFST-RC beams with strengthened ring-plate joints was studied by means of finite element method and orthogonal test. The results show that the crack growth of the joints experienced four processes of primary cracking, cracking, limiting and destruction. The legs play the role of bridge during the transmission of beam ends. Finally, the plastic hinges are formed at the junction of the legs and the beams, In line with “strong node weak member ” seismic design. The most significant factor affecting the ultimate bearing capacity, the displacement ductility coefficient and the energy dissipation coefficient of the three joints are the frame reinforcement ratio. The increase of the strength of the frame-beam concrete can increase the ultimate bearing capacity of the node, but the increase is not conducive to the seismic performance of the joints, so the strength of the frame-beam concrete should be rationally selected in engineering design.