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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。
The nonlinear finite element analysis of the ultimate bearing capacity of K-shaped tube plate joints shows that there are four main failure modes of this type of joint: local buckling failure mode of pressure pipe, yield failure mode of joint plate, combined damage of joint plate yielding and branch pipe Mode, node plate yielding and excessive plastic deformation of the main wall combined failure mode. The analysis of dimensionless geometrical parameters shows that the ultimate bearing capacity of the joint decreases with the increase of the diameter-to-thickness ratio of the main pipe and increases with the increase of the diameter of the main pipe. The ratio of the length of the branch pipe to the diameter of the branch pipe has little effect on the ultimate bearing capacity. The ultimate bearing capacity increases with the ratio of the wall thickness to the thickness of the main pipe less than 1.2 and the ratio of the wall thickness of the branch pipe to the thickness of the pipe is less than 0.6. The ultimate bearing capacity increases with the ratio of the length of the main pipe to the main pipe in the effective width of the joint plate. Proposed to the reasonable selection of dimensionless geometric parameters in node design. The least square method was used to return the ultimate bearing capacity formula of K-shaped tube plate joints.