(1 湖南大学土木工程学院钢结构研究所，长沙 410082； 2 广州市建筑工程职业学校，广州 510403)
［摘要］对K形管板节点极限承载力进行了非线性有限元分析，分析表明，该节点有四种主要破坏模式：受压支管局部屈曲破坏模式、节点板屈服破坏模式、节点板屈服与支管联合破坏模式、节点板屈服与主管壁过度塑性变形联合破坏模式。对无量纲几何参数分析表明，节点极限承载力随主管径厚比增加而减少，随支主管直径比增加而增加；支管插入板的长度与支管直径之比对极限承载力影响不大；板厚与主管壁厚比小于1.2、支管壁厚与板厚比小于0.6时，极限承载力随其增大而增大；板长与主管直径比在节点板有效宽度内，极限承载力增加。对节点设计中无量纲几何参数的合理选用提出了建议。采用最小二乘法回归了K形管板节点的极限承载力公式。
［关键词］K形管板节点；非线性有限元分析；极限承载力；无量纲几何参数；破坏模式；回归公式
Nonlinear finite element analysis on ultimate strength of tube-gusset K-joints
Shu Xingping1, Xiao Youqing1，2, Yuan Zhishen1, Peng Huanjia1(1 Steel Structural Institute of Civil Engineering College, Hunan University, Changsha 410082, China；2 Guangzhou Architectural Engineering Vocational School, Guangzhou 510403, China)
Abstract:Nonlinear finite element analysis of the ultimate strength of the tube-gusset K-joints was carried out by ANSYS program. Four typical failure modes were discovered through the nonlinear finite element analysis. The four typical failure modes are brace local buckling,plate yielding,the combination of plate yielding and brace failure and the combination of plate yielding and chord excessive plastic deformation failure. The ultimate strength of the joints increases as γ reduces and β increases, it has no significantly increased as ν increases. The ultimate strength increases as τ1<1.2，τ2<0.6 and as α increases in the effective width. The rational values of nondimensional geometric parameters were presented. At last, the regression formula of the ultimate strength of tube-gusset K-joints by the method of least squares was presented.
Keywords:tube-gusset K-joint; nonlinear finite element analysis; ultimate strength; nondimensional geometric parameter； failure mode； regression formula
作者简介：舒兴平，博士，教授，一级注册结构工程师，Email:shuxingping@sina.com。
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