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现行框架节点试验研究多侧重于平面节点,而结构和构件在地震作用下均处于空间受力状态,为比对平面节点与空间节点的受力性能差异,以十字形截面钢管混凝土异形柱-钢梁中柱节点为研究对象,设计并制作了两个空间节点模型和两个平面节点模型,通过施加恒定轴压比的竖向荷载和低周反复水平荷载,对节点模型进行了加载破坏试验。结果表明:空间节点和平面节点破坏现象基本一致,都具有良好的延性和耗能能力,平面节点更优。轴压比对节点的承载力和延性性能有一定的影响,随着轴压比增大,延性性能降低。
The experimental research on the current frame joints mostly focuses on the plane nodes, while the structures and components are in the space force state under the action of the earthquake. In order to compare the mechanical performance of the plane nodes and the space nodes, the cross-section CFST special-shaped columns-steel Liang Zhongzhang node is studied. Two space node models and two plane node models are designed and fabricated. Through the application of vertical load with constant axial compression ratio and low-cycle repeated horizontal load, the node model is subjected to loading failure test. The results show that the damage phenomena of space nodes and plane nodes are basically the same, all of them have good ductility and energy dissipation ability, and the plane nodes are better. The axial compression ratio has a certain influence on the bearing capacity and ductility of the joints. As the axial compression ratio increases, ductility decreases.