Modelling of tornado and microburst-induced wind loading and failure of a lattice transmission tower
Modelling of tornado and microburst-induced wind loading and failure of a lattice transmission tower
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DOI：
10.1016/s0141-0296(00)00045-6
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发表时间：
2001-04
影响因子：
5.5
通讯作者：
E. Savory;G. Parke;M. Zeinoddini;N. Toy;P. Disney
中科院分区：
文献类型：
--
作者：
E. Savory;G. Parke;M. Zeinoddini;N. Toy;P. Disney
世界范围内的许多输电线路和输电塔故障都是由与龙卷风和微暴流相关的高强度风（HIW）造成的。本文描述了瞬时龙卷风和微下击暴流事件的风速时程模型以及由此产生的格构塔上的载荷。一个动态的结构分析已经进行了两个HIW事件，预测龙卷风引起的剪切破坏，在现场观察。微下击暴流强度较低，持续时间较长，不会产生破坏。事实上，这种故障，如果他们在实践中发生，很可能是与一个更广泛的前端微下击暴流加载，其中导体负载的贡献。
Many transmission line and tower failures worldwide are attributed to high intensity winds (HIW) associated with tornadoes and microbursts. This paper describes models for the wind velocity time–histories of transient tornado and microburst events and the resulting loading on a lattice tower. A dynamic structural analysis has been undertaken for two HIW events, predicting a tornado-induced shear failure, as observed in the field. However, the microburst does not produce failure, due to its lower intensity and longer duration. Indeed, such failures, if they occur in practice, are likely to be associated with a more broad-fronted microburst loading in which conductor loads contribute.