Wind Tunnel Test on Wind-induced Nonlinear Vibrations of High-voltage Transmission Tower-line Coupling System

Wind-induced dynamic behavior of a high-voltage transmission tower-line system is investigated through an aeroelastic model test in a boundary layer wind tunnel.Dynamic tower failure phenomena were reproduced in wind tunnel tests for the first time.Test results show that the wind-induced vibration of the tower-line coupling system is of a distinctive nonlinear characteristic.The higher the wind velocity is,the more distinctive the nonlinearity is.Chaos arises in the vibration of the tower structure as the wind velocity reaches certain value.The higher-order model vibration of the tower-line coupling system is remarkable and the energy of it is even stronger than that of the lower-order model.The influence of the wires and insulators to the wind responses of the tower enhances as the wind speed increases.The higher-order model vibrations should be considered when the wind-induced dynamic responses of the transmission tower are analyzed.The nonlinear vibration of the wires and insulators should also be considered while designing a transmission tower.