转角输电塔线体系的断线效应研究

Research on Wire-breaking Effects of Transmission Angle Tower-line Systems

研究了某大型转角输电塔线体系在断线作用下的动力效应特点。首先基于三维空间索单元和空间梁单元建立了转角输电塔线体系的分析模型。在此基础上建立了输电塔线体系考虑断线效应的动力分析方法。以中国某220kV大跨度输电转角塔为工程背景,采用ABAQUS软件研究了塔线体系在不同断线工况下的动力响应的特点和规律。结果表明,输电转角塔发生断线损伤所引起的动力冲击效应较为显著。随后导线的轴向应力迅速减小,在经历振荡后塔线体系在新的位置处于内力和位移平衡状态。因此,在转角输电塔线体系的承载分析过程中应充分考虑断线事故所引起的冲击效应。

The dynamic shocking effects induced by wire-breaking accidents of transmission angle tower-line systems are actively investigated in this study.The mechanical model of the transmission angle tower-line system is developed based on the spatial beam elements and cable elements.Then,the dynamic analytical method for wire-breaking effects of transmission angle tower-line system is presented.A real large scale transmission angle tower system is taken as an example to investigate the properties of the dynamic responses induced by wire-breaking accidents with the aids of commercial package ABAQUS.The made observations indicate that there exist obvious dynamic shocking effects after wire-breaking accidents.The axial stresses of cables reduce dramatically and the tower-line system can reach the balance status after fluctuation.The influence of the wire-breaking on the transmission angle tower should be taken into consideration in the structural design and construction.