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为了研究钢管混凝土柱-混凝土梁外加强环焊接节点的抗震性能,参照实际工程设计制作了4个1:5的试验模型,试件采用Φ219的Q345无缝钢管柱,梁为混凝土梁。考虑实际地震情况的P-Δ效应,采用柱端加载方式,进行拟静力试验。得到了节点的滞回曲线、破坏情况,分析了其延性系数、等效粘滞系数、强度与刚度退化等抗震指标以及破坏机理,为实际工程提供参考依据,供设计参考。第一个节点由于梁端支座破坏,没有在节点核心区梁上形成塑性铰,其他三个节点都在距柱边缘一倍至两倍梁高处形成了X形塑性铰,该类节点属于延性破坏。试验结果表明,该种节点力学性能好,延性系数μ≈5.4～7.9,滞回曲线为饱满梭形,耗能性能很好,一定范围内,轴压比较小的节点耗能较大轴压比的强。
In order to study the seismic performance of welded joints of CFST column with reinforced ring, four 1: 5 test models were designed according to the actual engineering design. The specimens were made of Q245 seamless steel columns with Φ219 and the beams were concrete beams. Considering the P-Δ effect of the actual earthquake conditions, the column-end loading method is adopted to perform the quasi-static test. The hysteresis curves and damage conditions of the joints are obtained, and the seismic resistance indexes such as ductility coefficient, equivalent viscosity coefficient, strength and stiffness degradation and failure mechanism are analyzed, which provide reference for practical engineering for design reference. The first node has no plastic hinges on the beam of the core of the node due to the destruction of the beam end supports. The other three nodes form X-shaped plastic hinges at the height of one to two times the beam from the edge of the column, Ductile damage. The experimental results show that the mechanical properties of this kind of joint are good, the ductility coefficient μ≈5.4 ~ 7.9, the hysteresis curve is full bobbin shape, the energy dissipation performance is very good. In a certain range, Strong.