大跨空间结构X型方钢管相贯节点应力集中分析 Stress Concentration Analysis of the X-Type Steel Pipe’s Joints

目前X型方钢管在我国应用十分广泛，具有广阔的发展前景。本文借助ABAQUS对X型方钢管相贯节点的应力集中进行分析。我们定量探讨了5个几何参数对X型方钢管节点应力集中系数的影响，结果表明随着主管宽度B和支管厚度t、支管宽度b、主管与支管间夹角θ的增大，应力集中系数也随之增大；随着主管厚度T的增大，应力集中系数反而随之减小，同时得出了应力集中系数的计算公式，该公式对以后类似节点设计中几何参数的选取具有一定的参考价值，尤其是对建立热点应力幅疲劳方法。 At present, the X-type steel pipe is widely used in China and has broad development prospect. In this paper, ABAQUS is used to analyze the stress concentration of X-type steel pipe. We quantita-tively discussed how five geometric parameters influence the stress concentration factor X-type steel tube node, and the results showed that as the head pipe’s width B and branch pipe’s thickness t, branch pipe’s width b, and the intersection angle θ of head pipe and branch pipe increase, the stress concentration factor also increases; and as the head pipe’s thickness T increases, the stress concentration factor decreases, and the calculating formula of the stress concentration factor is obtained at the same time. The formula has a certain reference value to the future similar selection of geometric parameters in the design of the node, especially to the establishment of the hot fatigue stress amplitude method.