架空输电线路风振试验研究

高压架空输电线路是集高耸和大跨度两种特征于一身的风敏感结构体系 ,在风荷载作用下 ,风振效应显著。为了给某高压架空输电线路设计提供准确的风振系数并考查输电导线对塔架风振的影响 ,按照空气动力弹性相似准则设计制作了输电塔架气动弹性模型 ;根据能量平衡原理 ,模拟了塔架两侧的输电导线和地线 ;在大气边界层风洞中进行了风振响应的试验研究。获得了塔架风振响应等重要数据 ,并经回归分析得到了塔架风振系数的数学表达式。研究表明 ,塔架加速度响应随风速增加而增大 ;铁塔横风向加速度响应和顺风向加速度响应处于同一数量级 ,塔架设计和理论计算时应同时考虑顺风向和横风向的风振力 ;导线对铁塔风振的影响程度与风向角有关 ,但就整体而言 ,可以忽略该影响。

Research for the wind-induced vibration of the overhead power transmission line system

Overhead UHV power transmission line system is a combination of high rise tower and large span line.It can vibrate violently under wind load for it is sensitive to wind. To offer accurate wind induced vibration coefficients for design of a power transmission line system and check the influence of conductors on vibration of tower, an aeroelastic model was designed and manufactured according to the law of similarity.Based on the principle of energy balance,the conductors and ground wires which are connected by the tower were simulated;The model was tested to obtain its wind force and wind induced vibration response in an atmospheric boundary layer wind tunnel.Some important design data such as type coefficients, response of wind induced vibration were obtained and coefficients of wind induced vibration was formulated simply according to them.The research indicates that the acceleration responses of the tower increase with wind speed;The acceleration responses of the tower in both the following wind and the cross wind direction are adjacent to each other, so the wind induced vibration forces in both direction should be considered in the design and calculation; The influence on the tower's wind induced vibration provided by conductor varies with wind direction, but it can be ignored on the whole.