下击暴流作为一种局部强对流天气,是导致输电塔发生破坏的主要原因之一。为研究输电塔在下击暴流作用下的相关参数对输电塔风振系数的影响和等效静力风荷载分布,首先建立输电塔有限元模型并进行动力特性分析:建立冲击射流风场模型获取平均风速时程,使用谐波合成法模拟脉动风速时程,叠加得到下击暴流总风速时程;采用频域方法分析结构阻尼比、峰值因子以及脉动风速谱类型等参数对输电塔风振系数的影响程度及规律。然后,介绍并利用三种不同等效静力风荷载计算方法分析输电塔在下击暴流作用下的等效静力风荷载分布 ...
刘怡辰, 钟永力, 李顺, 晏致涛
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