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为考察焊接钢管节点的受力性能和不同加劲肋构造措施对节点承载力的影响,对3种不同构造措施的相贯节点进行了有限元分析。分析结果表明,空间钢管相贯节点主、支管交汇处为节点受力薄弱区域,特别是以受拉支管与主管相交处更为明显,3种加劲肋构造措施对应的相贯节点极限承载力均满足设计要求,其中:节点构造A型极限承载力最低,为设计荷载的0.9倍;节点构造B型和C型在应力、应变和承载力等方面规律基本一致;节点构造C型对应的弹性设计荷载比节点构造B型提高约30%,且相应的节点极限承载力比节点构造B型提高约6.3%;对加劲肋构造措施而言,在1.3倍设计荷载作用下,节点构造B型优于C型。
In order to investigate the stress behavior of welded steel pipe joints and the effect of different stiffeners on the bearing capacity of the joints, the finite element analysis of the three kinds of intersecting joints with different structural measures was carried out. The analysis results show that the intersection of the main pipe and the pipe branch of the space steel pipe joints is the weak area of the node, especially the intersection of the main pipe and the sub-pipe is more obvious. The ultimate bearing capacity of three kinds of joints corresponding to the three kinds of stiffeners Which meets the design requirements. Among them, the ultimate bearing capacity of type A structure is the lowest, which is 0.9 times of the designed load. The structure of type B and C are basically the same in terms of stress, strain and bearing capacity. Compared with the structure type B, the load increased by about 30%, and the ultimate bearing capacity of the corresponding node increased by 6.3% compared with that of the node structure type B. For the stiffener construction measures, under the 1.3 times design load, C type.