不对称导线对输电转角塔动力性能影响研究

Effects of Asymmetric Cables on the Dynamic Characteristics of Transmission Angle-tower

研究了不对称导线对输电转角塔动力特性的影响。首先基于空间杆系有限元理论建立了输电转角塔的力学模型。然后基于空间索单元建立了输电导线的力学模型。在此基础上组集形成输电塔线耦连体系分析模型。以中国某大跨度输电转角塔为实际工程背景,基于有限元方法考察了该结构的塔线耦连振动效应。进一步进行导线影响的参数研究,考察了相邻导线对输电塔本身振动特性的影响。结果表明,输电转角塔的塔线耦连效应显著,结构的扭转振型受到导线的影响非常显著。因此在转角塔的设计建造过程中,应当充分考虑到导线参数的影响。

The effects of asymmetric cables on the dynamic characteristics of transmission angle-tower are actively investigated in this study.The mechanical model of the transmission angle-tower and cables are developed based on the spatial member finite element approach.The coupling vibration model of the transmission tower-line system is constructed for further analysis.A real long span transmission angle tower system is taken as an example to examine the properties of the dynamic coupling effects based on finite element method.The parametric study is carried out to examine the effects of the cable on the dynamic properties of the angle tower.The made observations indicate that the dynamic coupling effects of the tower and cables are obvious and the rotational modes of the tower are substantially affected by the cables.The influence of the cables on the transmission angle tower should be taken into consideration in the structural design and construction.