放射性空间V型桥墩节点竖向承载性能研究

Research on vertical bearing performance of radioactive space V-shaped pier joints

采用1∶3缩尺比例设计了两个不同高度的放射性空间V型桥墩节点,对其进行竖向拟静力加载试验。试验结果表明:钢管墩、下弦主管、下弦管、加劲肋之间的焊缝处均是节点上部结构的薄弱部位,而节点整体的薄弱部位为混凝土底座。采用软件ABAQUS进行有限元数值模拟,对节点进行受力机理以及参数化分析。结果表明:上部加劲肋、平联钢管对节点竖向承载力贡献较大;钢管墩壁厚、直径对节点竖向承载力影响较大,而混凝土强度等级、平联钢管截面尺寸、加劲肋厚度对节点竖向承载力影响较小;将原节点底座改为加入H型钢的底座能有效解决底座构造复杂的问题。

Two radioactive space V-shaped pier joints with different height were designed with a 1:3 scale ratio to perform vertical pseudo-static loading tests.The test results indicate that the welds between the steel pipe pier,lower chord main pipe,lower chord pipe,and stiffeners are the weak part of the upper structure of the joint and the weak part of the whole joint is the concrete base.The software ABAQUS was used to carry out finite element numerical simulation,and the force mechanism and parameter analysis of the joints were carried out.The results indicate that the upper stiffeners and flat steel pipes have a greater contribution to the vertical bearing capacity of the joints;the wall thickness and diameter of the steel pipe piers have a greater influence on the vertical bearing capacity of the joints,while the concrete strength grade,the cross-section size of the flat steel pipes,and the thickness of the stiffeners has little influence on the vertical bearing capacity of the joints,and replacing original joint base with adding H-shaped steel can effectively solve the problem of complex structure.