高压输电塔线体系风致非线性振动气弹模型风洞试验

基于边界层风洞气弹模型试验的方法,对高压输电塔线耦联体系的风振响应进行了试验研究,首次在风洞中重现了输电塔线体系倒塔破坏现象.研究表明:在紊流风场中,高压输电塔线体系的风致振动呈现较强的非线性振动特征,随风速增加,非线性振动程度加剧,且输电塔结构振动呈现出混沌振动特征;由于输电线与绝缘子振动的影响,塔线体系中输电塔高阶模态的振动非常显著,且随风速增加,高阶模态的能量甚至强于低阶模态的能量;导地线与绝缘子对输电塔结构的影响随风速增加而增强.塔线体系的风振响应计算需考虑高阶模态的影响.结构设计时,需合理考虑大风时导地线与绝缘子的非线性振动对输电塔的影响.

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 has strong nonlinear characteristic. The higher the wind velocity, the stronger the nonlinearity. 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 low-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 vibration of the wires and insulators should be considered in designing a transmission tower.