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基于有限元方法对空间多支管焊接相贯节点的应力分布、变形分布及节点域塑性区的扩展过程等力学性能进行分析.主要探讨支管不同受力特征、节点域构造不同措施和加劲板厚度对节点极限承载力的影响,并与规范推荐公式进行对比.分析结果表明:该相贯节点极限承载力为设计载荷的2.85倍,节点构造合理且安全可靠;支管不同受力特征对节点极限承载力影响较大,尤其以平面外杆件受拉较为不利,最大削弱10.9%;节点域不同构造措施对节点承载力有一定影响,横隔板数量不起决定作用,而与位置有关,最大相差4.9%;加劲板厚度对承载力影响不大,仅相差2.4%.
Based on the finite element method, the stress distribution, deformation distribution and the expansion process of the plastic zone in the welded joints of the space manifold are analyzed, and the mechanical characteristics of the different mechanical characteristics of the branch pipe, the different measures of the joint domain structure and the thickness of the stiffener are discussed The results show that the ultimate bearing capacity of the joint is 2.85 times of the designed load, the structure of the joint is reasonable and safe, and the ultimate bearing capacity Especially in the case of out-of-plane rod tensioning, which is 10.9% less than the maximum. The different structural measures in the node area have a certain impact on the bearing capacity of the node, the number of the diaphragm does not play a decisive role, and the position difference is 4.9 %; Stiffener thickness has little effect on the bearing capacity, only a difference of 2.4%.