【摘要】 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.更多还原

【Abstract】 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.更多还原