Analysis on Fluctuating Wind Induced Vibration for High-Voltage Transmission Lines

As a flexible structure,transmission tower can generate nonlinear dynamic response under dynamic load such as natural wind.The wind induced vibration can cumulate fatigue damage of transmission tower and line.The transmission line system is a strong nonlinear coupled system composed of wire,insulators and tower.A finite element model with beam and link elements is built for both static analysis for transmission tower-line system on average wind condition and dynamic response analysis under fluctuating wind load.The structure response characteristics and influence on system strength are analyzed.The analysis shows that the equilibrium position of tower vibration is the position after average wind action.Dynamic response of tower top is more intense than bottom.Because axial force and axial stress of main material are bigger than auxiliary material,main material is the dominant factor to limit tower intensity and stiffness.