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通过对3个主管不同截面的T型相贯节点进行低周反复静力加载试验,分析了T型相贯节点在不同荷载作用下的受力变形和应力、应变情况,同时对主管和支管上的相贯线周围进行了应力、应变分析,对T型圆钢管相贯节点的平面内弯曲刚度进行了测试。采用荷载直接垂直于支管端部的加载方式,求出3个主管不同截面的T型相贯节点的最大承载力,并与规范计算结果进行对比分析,研究了相贯节点平面内的刚度问题。研究表明:在其他参数一定的情况下,支管与主管直径相差较多时,相贯节点刚度、强度均较弱。实际工程设计中宜对节点进行加强处理;支管与主管直径接近时,能够满足节点刚接要求,且节点刚度较大。
The low-cycle repetitive static loading tests of three tubular T-joints with different cross-sections were carried out to analyze the stress deformation and strain of the T-junction joints under different loads, and to the main and branch pipes at the same time. The stress and strain analysis were performed around the intersecting line and the in-plane bending stiffness of the T-shaped circular tube joint was tested. The maximum load-carrying capacity of the T-junction joints with different cross-sections of three main pipes is obtained by loading the load directly perpendicular to the end of the branch pipe. The results are compared with the standard calculation results and the stiffness in the plane of intersecting nodes is studied. The research shows that when the other parameters are certain, the difference between the diameter of the branch pipe and the main pipe is large, and the stiffness and strength of the joint node are weak. In actual engineering design, the nodes should be reinforced. When the diameters of the branch and the main pipe are close to each other, they can meet the requirements of the joints and the stiffness of the nodes is large.