【摘要】 输电线路是典型的风敏感结构。强风作用下输电线大幅抖振响应在其端部产生的顺风向动张力作用，是支撑线路的杆塔结构承载力设计的控制荷载和关键因素。基于大跨柔性索结构的静力与动力学方程，分别推导了输电线平均风偏的非线性静张力响应，以及脉动风作用下动张力响应的时域理论计算方法；再依据风工程理论，给出了顺风向动张力作用的背景分量和模态共振分量的功率谱及均方根的频域解析解。并以典型四分裂输电线路为工程实例，通过开展标准气弹模型风洞试验测试，对前述理论模型进行了分析和校验。研究表明：平均风偏状态对导线的动力特性和顺风向动张力的影响不可忽略，气动阻尼显著导致背景响应所占比重为主，对于共振分量，一阶面外模态响应贡献较大。该文提出的理论模型可以合理精确地评估输电线强风振动张力荷载效应。更多还原

【Abstract】 The long-span overhead transmission line is a typical wind-sensitive structure.Its along-wind dynamic tension at the end of the buffeting response is the controlling design load of the structural design of the support tower of the transmission line.Based on the static and dynamic mechanical analysis of the flexible cable structure,this paper propose a theoretical framework for the nonlinear static response of the transmission line under the mean wind and the linear fluctuation response near the mean yaw plane.Then,based on the stochastic vibration theory,the theoretical solution of the background component and the modal resonance component of the fluctuation along-wind dynamic tension response are given.A standard aero-elastic model wind tunnel test are conducted to investigated the validation of the theoretical framework.The results show that the influence of the yaw angle of the mean plane on the dynamic characteristics of the conductor under fluctuation status could not be ignored.The significant aerodynamic damping leads to the background response dominant.For the resonance component,the first out-of-plane modal response contributes dominantly.The theoretical framework can accurately evaluated the wind-induced dynamic tension action of the transmission line on the tower.更多还原