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节点的耗能机制影响其耗能能力,对结构整体的抗震性能影响显著。通过对5个圆钢管混凝土T形相贯节点和1个对比用圆钢管T形相贯节点的轴向往复荷载试验,观察其破坏模式,分析节点轴向荷载-支管加载端轴向位移曲线。结果表明:圆钢管混凝土T形相贯节点的破坏模式有主管受弯破坏、支管屈服破坏、支管屈曲破坏和焊缝破坏;轴向荷载作用下圆钢管混凝土T形相贯节点的合理耗能机制是支管屈曲或屈服耗能。在抗震设防区应通过合理的设计使节点的破坏模式为支管屈服或屈曲破坏。
The energy dissipation mechanism of the node affects its energy dissipation capacity, which has a significant impact on the seismic performance of the structure as a whole. The axial reciprocating load test of five T-shaped cross-section joints of CFST and one T-shaped cross-section steel pipe was carried out. The failure modes were observed and the axial displacement curves at the loading end of the axial load-branch pipe joints were analyzed. The results show that the failure modes of T-shaped tubular CFR joints include failure of main pipe bending, buckling of branch pipe, buckling of branch pipe and failure of weld joint. The reasonable energy dissipation mechanism of T-shaped cross-section of CFST under axial load is the branch pipe Buckling or yielding energy. In the earthquake-resistant zone, the failure mode of the node should be designed to yield or buckling damage by reasonable design.