风荷载下输电塔绝缘子断裂对塔体性能的影响

Influence of Insulator Rupture on Structural Behavior of Power Transmission Tower Under Wind Load

摘要:

选用Davenport风速谱,利用谐波叠加法,模拟动风荷载.以常见500 kV酒杯型直线塔为分析对象，应用有限元软件Ansys，建立3塔4跨模型.考虑几何非线性，分析10级风下悬垂型绝缘子断裂后对塔体结构性能产生的影响.分析表明，绝缘子断裂使断后仍与导线相连的塔体的塔柱等主要受力构件应力增大10%～32%，支座反力增大6%～21%.因此,风荷载与绝缘子断裂的组合作用在输电塔的设计中不容忽视.

Abstract:

Based on Davenport wind speed spectrum,harmonic superposition method was available to simulate the dynamic wind load. Commercial FEM software ANSYS was employed to analyze the three towers and four-span straight-cup-transmission lines model.Geometric nonlinearity was taken into account in FEM model, structural behavior of the transmission tower was investigated when insulator rupture and wind force 10 loading case happened simultaneously.Analytical results show that after insulator rupture, the stress of the main structural members such as the columns remaining connected with the lines increases by 10%~32%,and the base reaction force increases by 6%～21%.The combined action of wind-load and insulator-rupture can not be neglected in design.