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

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 single-circuit transmission tower was obtained. The research results reveal the characteristics of wind-induced vibration of 1 000 kV UHV single-circuit transmission tower,which can be references for the tower's wind-resistance design.