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通过6个钢筋混凝土框架异型中节点试件在低周反复荷载作用下的试验,分析节点核心区尺寸、轴压比等因素对异型节点抗震性能的影响。研究表明:上柱截面发生变化对异型节点抗震性能的影响不明显,当其变化量小于1/6柱高时,即Δhchbl/2时,建议按中间层边节点考虑。此外,轴压比增大对异型节点通裂阶段后组合体试件的抗震性能产生不利影响,对该类节点进行抗震设计时,建议轴压比应小于0.3。
Based on the test of 6 specimens with different shaped sections of RC frame under low cyclic loading, the influences of core size, axial compression ratio and other factors on the seismic behavior of abnormal joints were analyzed. The results show that the change of the cross-section of the column has no obvious effect on the seismic performance of the special-shaped nodes. When the variation is less than 1/6 of the height of the column, ie Δhc hbl / 2, Layering nodes to consider. In addition, the increase of axial compression ratio has an adverse effect on the seismic performance of composite specimens after the cracking of special-shaped joints, and the proposed axial compression ratio should be less than 0.3 for the seismic design of such joints.