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为研究装配式钢框架节点带Z字形悬臂梁段和削弱梁段拼接的抗震性能,采用拼接区和削弱梁段共同耗能设计了4个试件。对4个试件进行了低周往复加载试验以及单调及往复加载的有限元分析。通过对试件的破坏模式和拼接区的滑移情况进行了分析,研究了以梁端弯矩-转角表征的滞回曲线、骨架曲线、耗能能力、转动能力等。结果表明:试件主要利用削弱梁段的塑性变形和拼接区的滑移实现耗能;其失效模式为螺孔或者焊缝处撕裂、削弱梁段处局部屈曲和削弱梁段处弯扭失稳;为保证节点充分发挥耗能能力,应增大削弱梁段处的侧向约束,防止发生弯扭失稳;为满足现场安装方便的要求和应对工厂加工精度不足的现状,可以在悬臂梁段翼缘开大孔;为降低工厂加工难度,可以将方钢柱内隔板替换为三角形垂直加劲肋。
In order to study the seismic behavior of prefabricated steel frame joints with zigzag cantilever sections and to weaken the splicing of beam sections, four specimens were designed using the joint energy dissipation of the splicing section and the weakened beam section. Low-cycle reciprocating loading test and finite element analysis of monotonic and reciprocating loading on four specimens were carried out. By analyzing the failure mode and the slip of the splicing area, the hysteresis curve, the skeleton curve, the energy dissipation ability and the rotation ability are characterized by the bending moment-rotation angle of the beam end. The results show that the specimens mainly make use of the plastic deformation of the beam section and the slip of the splicing area to achieve the energy dissipation. The failure mode is that the screw hole or the weld seam is torn to weaken the local buckling at the beam section and weaken the bending and torsional loss at the beam section In order to ensure that the nodes give full play to their energy-dissipation capacity, the lateral restraint at the beam sections should be increased to prevent buckling and buckling instability. To meet the requirement of on-site installation convenience and to cope with the deficiencies of factory machining accuracy, Margins open big hole; to reduce the difficulty of factory processing, the square steel column can be replaced by the inner diaphragm vertical stiffeners.