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为了确保结构安全及优化设计,以一幢28层钢管混凝土结构实际工程为背景,针对3个构造不同的足尺矩形钢管混凝土柱-H型钢梁节点开展了低周反复荷载试验,对节点的破坏形态、滞回曲线、位移延性和耗能等进行了较系统的研究。试验结果表明:3个节点均实现了“强柱弱梁”、“强节点弱构件”的设计目标,破坏形态均为梁端形成塑性铰;各节点的滞回曲线均呈梭形,表现出较好的耗能性能;当层间位移角不大于1/50时,节点构造对其承载能力和耗能无显著影响;3个节点的刚度退化规律基本一致。
In order to ensure the structural safety and optimize the design, a low-cycle cyclic loading test was carried out for three full-height concrete-filled steel tubular column-H beam joints with three different configurations based on the actual engineering of a 28-story CFST structure. Damage morphology, hysteresis curve, displacement ductility and energy consumption were systematically studied. The test results show that all the three nodes have achieved the design goals of “strong column weak beam” and “strong node weak component”, and all the failure forms are plastic hinges at the beam ends; Shape, showing good energy dissipation performance. When the displacement angle between layers is not more than 1/50, the node structure has no significant effect on the bearing capacity and energy dissipation. The stiffness degeneracy of the three nodes is basically the same.