B类风场与台风风场下输电塔的风振响应和风振系数

为研究常规B类风场与台风风场下输电塔的风振响应差异，以沿海地区某四回路角钢输电塔为原型建立了有限元模型，采用谐波叠加法生成两类风场下的风速时程，并在时域内进行了输电塔风振响应和风振系数的数值分析。结果表明：台风风场的高湍流特性导致其作用时各测点的顺风向风振响应均大于B类风场下的对应值。两类风场下，输电塔的风振系数比值约为1.25。因此，台风多发地区的输电塔设计必须考虑台风高湍流引起的动力风荷载增大效应。此外还进行了气弹模型风洞试验，以研究不同风速下的气动响应和风振系数，并将试验结果与理论计算进行了分析比较，验证了数值分析的适用性。

Wind-induced response and wind load factor of transmission tower under terrain B wind field and typhoon wind field

A numerical analysis of a four-circuit angle-steel transmission tower under conventional terrain B wind field and typhoon wind field was performed for investigating wind-induced response. A FEM model was established, and the dynamic response was calculated with the fluctuating wind field simulated by harmonic wave superimposing method. Based on data of numerical analysis, wind-induced response under each wind field was discussed. Essential conclusions are as follows: high turbulence and strong variability of typhoon wind field has great influence on transmission towers. RMS of acceleration under typhoon wind field is larger than that under terrain B wind field. Under the two types of wind field, the average ratio of wind load factor is about 1.25.Therefore, the design of transmission towers in typhoon-prone areas should take the fluctuating wind load magnification effect into consideration. Furthermore, an aerolastic model wind tunnel test of the transmission tower was performed to study its wind-induced response under different velocity. The test results were compared with theoretical values and the accuracy of numerical analysis was verified.