龙卷风作用下空间桁架的受力分析

Force Analysis of Space Truss Subjected to Tornado Loads

龙卷风是一种破坏力巨大、风场结构复杂的暴风。本文从涡运动理论、实测数据统计分析、半经验公式和龙卷风风险度模型等几方面解析龙卷风风场结构,并结合实例建立龙卷风的风场数值模型。提出在龙卷风作用下桁架结构的荷载处理方法和加载方法,以输电塔为例分析在龙卷风作用下的受力情况,结果显示龙卷风作用下桁架结构的响应同相同风速自然风作用下的响应很相近。

Tornado is a striking destructive and complex storm. The numerical wind field model of tornado is established by summing up the previous theory including the vortex movement theory, statistical analysis of measured data, degree of risk and an actual event. A new load method of space truss Subjecting to tornado has been put forward. Force Analysis is given that transmission tower as a kind of typical space truss subjected to Tornado Loads. The calculation results show that the response of transmission tower which subjected to tornado loads is similar to natural wind loads.