输电塔连接节点有限元参数化建模与分析

Finite Element Parametric Modeling and Analysis of Transmission Tower Connection Nodes

现行规范对输电塔上部结构与基础连接节点的底板简化计算,该节点整体承载力裕度不明确。为有效地建立该节点的有限元模型,判断该节点整体安全裕度,通过采用ABAQUS软件从单元类型、材料属性、模型装配、接触形式、边界条件、分析步设置、荷载计算和加载设置等方面对该节点进行了有限元参数化建模,并对底板厚度进行优化分析。结果表明:该节点破坏形式为靴板与主角钢的连接螺栓在接触平面发生剪切破坏;与现行规范的计算结果相比,有限元计算能充分考虑连接节点整体受力和塑性性能,优化后底板厚度可有效减少。该研究成果为该节点的安全评估提供了合理的参考依据,也为后续输电塔整体加固奠定了研究基础。

The current specification simplifies the calculation of the bottom plate of the connection node between the upper structure and the foundation of the transmission tower,and the overall bearing capacity margin of the node is not clear.In order to effectively establish the finite element model of the node and judge the overall safety margin of the node,the finite element parametric modeling of the node was carried out by using ABAQUS software from the aspects of element type,material properties,model assembly,contact form,boundary conditions,analysis step setting,load calculation and loading setting,and the thickness of the bottom plate was optimized.The results show that the failure mode of the node is the shear failure of the connecting bolt between the shoe plate and the main angle steel in the contact plane;Compared with the calculation results of the current code,the finite element calculation can fully consider the overall stress and plastic performance of the connection node,and the thickness of the bottom plate can be effectively reduced after optimization.The research results provide a reasonable reference for the safety assessment of the node,and also lay a research foundation for the subsequent overall reinforcement of the transmission tower.