特高压钢管塔TY型节点滞回性能有限元分析

Finite Element Analysis on Hysteresis Performance of TY Typed Node in UHV Steel Tube Tower

为研究特高压钢管塔TY型节点的滞回性能,以某一特高压输电线路中钢管塔TY型节点为例,通过数值模拟方法得到其滞回曲线、骨架曲线、能耗系数,分析了主管和支管直径、节点板厚度、主管轴心压力、连接插板厚度及支管间隙尺寸等参数对TY型节点滞回性能的影响,总结出这些参数对抗震性能影响的规律。研究表明:TY型节点本身具有良好的抗震性能;进行反复加载时,主管径厚比增大,节点承载力、滞回性能、刚度有很大提高;支管径厚比、连接插板厚度增大对提高节点耗能能力有利;主管、支管轴压比增大,节点的滞回性能、总耗能能力减小;间隙尺寸增大,节点承载力、滞回性能降低,间隙尺寸大于84.5 mm时,则对节点承载力没有明显影响。

In ordet to study hysteresis performance of TY typed node in the UHV steer tube tower, this paper takes the TY typed node in the steel tube tower of an UHV transmission line for example and obtains relevant hysteretic curves, skeleton curves and energy dissipation coefficients by means of numerical simulation. It analyzes effect of parameters such as diame- ters of the main pipe and the branch tube, thickness of the node plate, axial pressure of the main pipe, thickness of the con- necting plate and the size of branch gap on hysteresis performance of TY typed node, and summarizes the law of these pa- rameters on anti-seismic performance. The research indicates that TY typed node has good anti-seismic performance, and bearing capacity, hysteresis performance and rigidity of node is greatly improved due to increase of the diameter-thickness ratio of the main pipe as performing repeated loading. In addition, it is favorable to improve energy dissipation ability of the node by increasing diameter-thickness ratio of the branch pipe and thickness of the connecting plate. As axial pressure of the main pipe and the branch pipe increases, hysteresis performance and the total energy dissipation ability of the node decrea- ses. And increase of the gap size may reduce bearing capacity and hysteresis performance of the node. When the gap size is greater than 84.5 ram, there is no obvious effect on bearing capacity of the node.