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进行了10个劲性环梁式钢管混凝土节点的低周往复荷载的试验研究,探讨了牛腿长度、环梁截面尺寸、钢筋锚固方式、轴压比对节点破坏和抗震性能的影响。结果表明:此类节点有效实现了梁铰破坏机制,满足强柱弱梁的设计原则;牛腿长度及环梁截面尺寸是影响节点力学性能的主要因素,随着牛腿长度及环梁截面尺寸的增加,节点的耗能能力及延性系数均增加,破坏模式由脆性破坏变为延性破坏;钢筋搭接于钢牛腿翼缘即可满足节点的抗震性能。
The test of 10 low-cycle cyclic loadings of CFST-CFT joints was carried out. The effects of the length of the leg, the cross-sectional area of the ring beam, the anchorage method of the steel bar and the axial compression ratio on the failure and seismic performance of the joints were investigated. The results show that this type of joint effectively achieves the beam hinge failure mechanism and meets the design principle of strong column and weak beam. The length of the corbels and the cross-section of the ring beam are the main factors that affect the mechanical properties of the joints. , The energy dissipation capacity and ductility coefficient of nodes increase, and the failure mode changes from brittle failure to ductile failure. Reinforcing steel bars can meet the seismic performance of the joints by laping on the steel cowl flange.