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具有高柔性的特高压单柱拉线塔对风荷载十分敏感,风振系数的确定是其设计和应用的基础。建立了特高压单柱拉线塔塔线体系的有限元模型,阐述了基于振型叠加法的风振系数计算方法,考虑结构的前两阶振型的影响,基于时程分析的数据计算了单柱拉线塔的风振系数。结果表明:主柱上存在横隔材的位置风振系数会发生突变;时程分析得到的加权风振系数与按照荷载规范计算得到的加权风振系数较为接近;等效静力风荷载作用下,迎风侧主材轴力与风振响应的最大值较为接近,且大于平均风下主材的轴力。
The UHV single tower with high flexibility is very sensitive to the wind load. The determination of the wind-induced vibration coefficient is the basis of its design and application. The finite element model of UHV single column cable tower was established. The calculation method of wind vibration coefficient based on modal superposition method was expounded. Considering the influence of the first two modes of structure, Wind tower tower wind-induced vibration coefficient. The results show that there is a sudden change in the wind-induced vibration coefficient at the position of the cross-member on the main column. The weighted wind-induced vibration coefficient obtained by the time-history analysis is close to the weighted wind-induced vibration coefficient calculated according to the load criterion. The maximum value of axial force and wind-induced vibration response of the main windward member is close to that of wind-induced main member.