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通过对内置加强板的空间DKYY型圆钢管相贯节点的足尺试验和有限元模拟,分析节点应力和变形的发展过程。结果表明:节点在1.3倍设计荷载作用下保持弹性工作状态,具有较高的安全度,可以满足设计承载力需求,有限元分析较好地模拟了加载试验过程,有效弥补了节点试验测点较少的不足,可用于节点受力性能的全面评估。另外,选取较小的主管径厚比和内置加劲板可提高其径向刚度,确保节点破坏时主管处于弹性工作状态;支管加劲板对支管的弹性刚度没有影响,对其承载能力的影响不大,但可以减小支管的径向变形,局部改变支管的应力分布。该节点的构造设计是合理的,其在设计荷载作用下的受力是安全的。
Through the full-scale test and finite element simulation of the joints of DKYY-type round steel pipe with built-in stiffener, the development of node stress and deformation is analyzed. The results show that the node maintains the elastic working state under 1.3 times of design load and has higher safety, which can meet the design requirements of bearing capacity. The finite element analysis simulates the loading test process well and effectively compensates the node test point Less deficiencies, can be used for a comprehensive assessment of the stress performance of the node. In addition, selecting the smaller diameter ratio of the main pipe and the built-in stiffener increases the radial stiffness of the main pipe to ensure that the main pipe is in elastic working condition when the node is damaged. The stiffened plate of the branch pipe has no influence on the elastic rigidity of the branch pipe and has little effect on its carrying capacity , But it can reduce the radial deformation of the branch pipe and change the stress distribution of the branch pipe locally. The structural design of this node is reasonable, and its force under design load is safe.