Wind Tunnel Test and Numerical Simulation on Transmission Tower-Line Coupling System

Based on the engineering background of a certain 500kV power transmission line,a full aero-elastic model of a two-span tower-line system is designed and wind tunnel test is performed to research wind-induced response of the transmission line.Utilizing finite element analysis software ABAQUS a spatial finite element model of the two-span tower-line system is built and dynamic response of the tower-line system in stochastic wind field is calculated,and the coupled vibration characteristics of the transmission tower-line system is discussed.Research results show that the existence of transmission line makes the background response of the tower-line system intensified and the damping of tower-line system increased,so the resonant response is weakened;the coupling effect of tower-line system causes different impacts on acceleration and displacement of tower.The energy cross between the power spectral density of tower response and that of transmission line may appear at high wind speed,and it makes the coupling between tower and line greatly intensified,and it is highly possible to lead to coupled resonance of tower-line system,therefore during the design of transmission tower it is necessary to take the adverse affect on the response of tower due to coupled vibration of the tower-line system into account.