输电塔架的动力特性分析

雪灾会对电力设施造成巨大的破坏。通过采用ANSYS程序对输电塔架进行动力特性的分析，以考虑不同的裹冰厚度对塔架动力特性的影响。分析结果表明：塔架的自振频率随裹冰厚度增加而减小，特别是当裹冰厚度达到50～60mm时，减小幅度在30％以上。塔架动力特性的变化必将对结构的地震、风栽的动力响应产生较大的影响，为以后的动力响应研究，如在地震、风载作用下的动力响应打下基础。

ANALYSIS OF TRANSMISSION TOWER DYNAMIC CHARACTERISTIC

Since snow disaster to the electric power facility’s huge destruction, the dynamic properties of the electric transmission tower are analyzed with the ANSYS procedure,in order to consider the influences on the dynamic properties of the tower wrapped by a variety of ice thickness.The analytical results indicate the natural frequency of tower will reduce with the increase of wrapped ice thickness,especially when wrapped ice thickness reached 50-60 mm. The decrease range more than 30 percent. The change of dynamic characteristics have a greater influence on for the dynamic response of structures under action of the earthquake and wind.This paper lays a good foundation for the later dynamic properties research under action of earthquakes or winds.