1000kV特高压山区单回路输电塔风振特性研究

Wind Vibration Characteristics of Single-Circuit Power Transmission Tower in Mountain Area for 1 000kV UHV Transmission Lines

1000kV特高压单回路输电塔属于风敏感结构,风与结构的相互作用十分复杂,风荷载常常是设计的主要控制荷载之一。以某1000kV单回路塔为研究背景,获得了结构的自振动力特性。基于随机振动理论推导了铁塔的风振系数计算公式,研究了垂直线路方向和顺线路方向的振型模态,同时分析了结构各层的风振系数分布特点,并与设计规范进行对比,得出特高压单回路输电塔风振系数计算的经验公式。通过研究,揭示了1000kV特高压单回路塔的风致振动特性,结果可作为特高压铁塔结构抗风设计的参考。

1 000 kV UHV single-circuit power transmission tower is wind-sensitive, in which the wind load becomes one of the main control loads in the structure design due to the complex interaction between wind and structure. Taking a 1 000 kV single-circuit transmission tower as research background, the vibration characteristics of tower structure were obtained. Based on the random vibration theory, the formula of wind vibration coefficient of the tower was derived, as well as the vibration modes of the line at vertical and parallel directions were studied. Meanwhile, the distribution characteristics of wind vibration coefficients at different structure layers were also studied and compared with those in the design code. Finally, the empirical formula of wind vibration coefficient for UHV reveal the characteristics of wind-induced vibration of single-circuit transmission tower was obtained. The research results 1 000 kV UHV single-circuit transmission tower, which can be references for the tower＇s wind-resistance design.