装配式钢框架节点带Z字形悬臂梁段和削弱梁段连接的抗震性能研究

发布时间：2018-03-13 17:38

本文选题：装配式钢框架　切入点：削弱梁段　出处：《建筑结构学报》2017年06期 　论文类型：期刊论文

【摘要】：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。
[Abstract]:In order to study the seismic behavior of steel frame joints with Z-shaped cantilever beams and to weaken the splicing of beam segments, the aseismic behavior of prefabricated steel frame joints is studied. In this paper, four specimens are designed by using splicing zone and weakening beam segment together. Four specimens are subjected to low-cycle reciprocating loading test and finite element analysis of monotonic and reciprocating loading. The failure mode and slip of the splicing zone are analyzed by means of the failure mode of the specimen. The migration situation was analyzed, The hysteretic curve, skeleton curve, energy dissipation capacity and rotation ability represented by bending moment and turning angle at the end of beam are studied. The results show that the energy consumption is mainly realized by weakening the plastic deformation of beam segment and sliding in the joint area. The failure mode is that the hole or weld seam is torn, the local buckling of the beam segment is weakened and the bending and torsional instability of the beam section is weakened, in order to ensure the full exertion of the energy dissipation capacity of the joint, the lateral constraint at the weakening beam segment should be increased to prevent the bending and torsional instability from occurring. In order to meet the requirement of convenient installation on the spot and to deal with the current situation of insufficient machining precision in the factory, large holes can be opened in the flange of cantilever beam section, and in order to reduce the processing difficulty in the factory, the square steel column inner partition plate can be replaced with triangular vertical stiffening rib.
【作者单位】：北京工业大学北京市高层和大跨度预应力钢结构工程技术研究中心;
【基金】：国家自然科学基金项目(51678010) 北京市自然科学基金重点项目(8131002)
【分类号】：TU352.11;TU391

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