下击暴流作用下输电铁塔荷载取值及承载性能分析

发布时间：2018-06-17 23:01

本文选题：下击暴流 + 风速剖面　；参考：《中国电机工程学报》2014年24期

【摘要】：下击暴流会给输电线路造成巨大危害,已引发生多起倒塔事故。基于ASCE关于高强度风区域输电线路设计的相关规定,综合考虑下击暴流尺度特征和输电线路经济性设计原则,提出了下击暴流作用下输电线路的设计荷载取值建议。采用Vicroy风速剖面模型,计算得到了内陆和沿海地区典型输电铁塔在下击暴流作用下的风荷载。建立了输电铁塔空间有限元分析模型,通过结构受力分析,确定了输电铁塔在下击暴流作用下的受力特征和破坏模式。结果表明:下击暴流作用下,输电铁塔杆件应力主要由45°大风控制。对于设计风速较低的内陆地区,尽管铁塔结构高度不在下击暴流最高风速区域,下击暴流风荷载明显高于常规风,塔腿横隔面以上主材会首先发生破坏;对于设计风速较高的沿海地区,下击暴流风荷载低于常规风,下击暴流在铁塔设计中不起控制作用。
[Abstract]:The downburst will cause great harm to the transmission line, which has caused many tower accidents. Based on the relevant provisions of ASCE on the design of transmission lines in high intensity wind regions and considering the scale characteristics of downburst flow and the economic design principles of transmission lines, suggestions on the design load values of transmission lines under the action of downburst currents are put forward. The wind load of typical transmission towers in inland and coastal areas under the action of downburst current is calculated by using the wind profile model of Vicroy. The spatial finite element analysis model of transmission tower is established, and the stress characteristics and failure mode of transmission tower under the action of downburst current are determined through structural stress analysis. The results show that the stress of transmission tower member is controlled by 45 掳wind. For the inland area with lower design wind speed, although the height of the tower structure is not in the maximum wind speed area, the downburst wind load is obviously higher than that of the conventional wind, and the main material above the cross plane of the tower leg will be destroyed first. For coastal areas with high design wind speed, the downburst wind load is lower than that of conventional wind, and the downburst flow does not play a controlling role in the design of iron tower.
【作者单位】：中国电力科学研究院;江苏省电力公司电力科学研究院;
【分类号】：TM753

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