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以平面K型主圆支方钢管节点的试验数据为基础,建立有限元参数分析模型,进行了非线性有限元参数分析。研究揭示了节点受力全过程,破坏模式以及分布规律。重点考察了支管边长与主管直径比值β、主管的径厚比γ和支管与主管的壁厚比τ对节点极限承载力的影响。有限元参数分析结果表明:主管的径厚比γ和支管与主管的壁厚比τ对节点极限承载力影响较大,而支管边长与主管直径比值β影响较小;γ和τ值均比较小的节点破坏时支管达到杆件极限承载力,说明节点效率大于1,其它几何参数的节点破坏时支管并没有达到杆件极限承载力即节点效率小于1。在国际焊接协会中的平面K型圆钢管节点极限承载力计算公式的基础上,应用多元线性回归方法拟合出平面K型主圆支方钢管节点的承载力计算公式;通过公式本身的回归校验和试验结果以及有限元数据的统计分析,证明该文建立的该类节点极限承载力计算公式具有较高精度。
Based on the experimental data of K-type main circular steel pipe joints, the finite element analysis model was built and the nonlinear finite element analysis was carried out. The study reveals the whole process of node stress, failure mode and distribution. The influence of the ratio of side length of support to the diameter of main pipe, the diameter-thickness ratio of main pipe, and the ratio of branch-pipe to main wall thickness on the ultimate load-bearing capacity of the joints were investigated emphatically. The results of finite element analysis show that the diameter-thickness ratio γ of the main pipe and the wall thickness ratio τ of the branch pipe and the main pipe have a greater influence on the ultimate bearing capacity of the joints, while the side length of the branch pipe has a smaller effect on the diameter ratio β of the main pipe. When a small node is damaged, the ultimate bearing capacity of the pipe reaches the rod, indicating that the node efficiency is greater than 1, and when the node with other geometric parameters is damaged, the branch pipe does not reach the ultimate bearing capacity of the rod, ie, the node efficiency is less than 1. On the basis of the calculation formula of the ultimate bearing capacity of the K-joints of the planar K-joints in International Welding Society, the formula of bearing capacity of the K-joints of the K-section main-branch is obtained by using the multivariate linear regression method. The results of the tests and tests, as well as the statistical analysis of the finite element data, show that the formula for calculating the ultimate bearing capacity of such joints is of high precision.