王  彬，  赵宪忠
   （同济大学建筑工程系，上海 200092）

[摘要] 基于ABAQUS工作平台，建立了已完成的8个平面K形圆钢管搭接节点滞回试验的数值分析模型。将轴向往复荷载下试验节点的数值计算结果与试验结果进行对比分析，讨论其破坏模式、滞回曲线、最大承载力的对比结果。结合影响节点性能的主要几何参数，建立71个数值分析模型进行参数分析，通过多元参数回归方法拟合得出基于Menegotto-Pinto方程的节点贯通腹杆轴力一变形骨架曲线，并提出了对应的简化滞回关系。分析结果表明：恢复力模型与数值分析结果吻合良好，可供工程设计与数值简化计算参考。
[关键词] 圆钢管相贯节点；数值分析；参数分析；恢复力模型
中图分类号：TU391    文献标识码：A  文章编号：1002-848X(2012) Sl-0716-05

Research on hysteretic model of overlapped CHS K-joints
Wang Bin, Zhao Xianzhong
( Department of Building Engineering, Tongji University, Shanghai 200092, China)

Abstract: Based on nonlinear finite element method,a numerical model was constructed to investigate the hysteric behavior of 8 tested overlapped CHS K-joints under axially cyclic loading. The accuracy of the numerical model was verified by comparing the numerical analyses with mentioned joints focusing on failure mode, hysteretic curve and ultimate capacity. The verified finite element model was conducted on 71 0verlapped CHS K-joints of various geometrical parameters. According to the result of parameter study, the parametric equation of the through brace's skeleton curve was established and so was the hysteretic relationship. Results using the proposed hysteretic model agree well with the finite element analysis results, and the hysteretic model can be used into the initial design of the practical engineering and the numerical analysis.
Keywords: overlapped CHS K-joints; numerical analysis; parametric analysis; hysteretic mode