钢管结构K型搭接节点滞回性能参数分析

Parametric analysis on hysteretic performance of unstiffened overlapped CHS K-joints in steel tubular structure

为揭示K型搭接节点隐藏焊缝焊与不焊对节点抗震性能的影响,优化了该类节点的施工工艺.按照影响钢管结构搭接节点的关键参数β、γ、τ,设计了基本试件及参数试件,采用ANSYS非线性有限元法,对钢管结构K型搭接节点隐藏焊缝焊与不焊进行了数值模拟,得到了各参数试件的滞回曲线、骨架曲线和延性性能等抗震性能指标.研究结果表明,β、γ、τ参数变化对节点承载力的影响不是十分显著,隐藏焊缝不焊接节点的滞回性能及延性优越于隐藏焊缝焊接的节点.支主管直径比β越大,节点延性越好;主管径厚比γ越大,节点延性越差.支主管厚度比τ对节点延性影响不大,尤其是τ对隐藏焊缝不焊接节点的延性基本没有影响.

To reveal the influence of both welded and non-welded hidden weld seam of unstiffened overlapped CHS（ circular hollow sections） K-joints on the seismic performance of joints, the construction technology of such joints was optimized. According to such key parameters as β, γand τ which affect the unstiffened overlapped CHS K-joints in steel tubular structure, both basic and parametric specimens were designed. With the ANSYS nonlinear finite element method, the numerical simulation for welded and non-welded hidden weld seam of unstiffened overlapped CHS K-joints in steel tubular structure was performed. In addition, the hysteretic loops, skeleton curves and such seismic resistance indexes as ductility were obtained. The results indicate that the variation of such parameters as β, γ and τ- has no significant effect on the bearing capacity of joints. The hysteretic performance and ductility of joints with non-welded hidden weld seam are superior to those of joints with welded hidden weld seam. The bigger the brace-to-chord diameter ratio β, the better the ductility of joints is. The larger the chord diameter to thickness ratio γ, the poorer the ductility of joints is. The brace-to-chord thickness ratio τ has less effect on the ductility of joints, and especially has no effect on the ductility of joints with non-welded hidden weld seam.