建筑钢结构进展2025，Vol.27Issue(10)：91-103,13.DOI:10.13969/j.jzgjgjz.20240510002
下击暴流下输电塔时变响应分析及等效静力风荷载分析方法探讨
Discussion of Time-Varying Response Analysis and Equivalent Static Wind Load Analysis Methods of Transmission Tower under Downburst
摘要
Abstract
Downburst,a kind of localized strong convective weather,is one of the main causes of damage to transmission towers.To study the influence of relevant parameters and equivalent static wind load distribution of transmission tower under downburst,this paper first establishes a finite element model of the transmission tower and analyzes its dynamic characteristics.Then,an impinging jet wind field model is established to obtain the average wind speed time history,and the harmonic synthesis method is used to simulate the pulsating wind speed time history,which is superimposed to get the total wind speed time history of the downburst.The frequency domain method is used to analyze the influence of structural damping ratio,peak factor,and pulsating wind speed spectrum type on the wind vibration coefficient of the transmission tower.Then,three different equivalent static wind load calculation methods are introduced and utilized to analyze the distribution of the equivalent static wind load of the transmission tower under downburst.The displacement response obtained by the frequency-domain method and the time-domain method are compared to clarify the equivalent static wind load calculation method applicable to the transmission tower under downburst.Finally,the effects of different wind environment parameters and tower heights on the distribution of equivalent static wind loads and dynamic response of transmission tower are discussed.The study provides a useful reference for the wind-resistant design of transmission tower under downburst.关键词
下击暴流/输电塔/风振响应/风振系数/等效静力风荷载Key words
downburst/transmission tower/wind vibration response/wind vibration coefficient/equivalent static wind load分类
信息技术与安全科学引用本文复制引用
刘怡辰,钟永力,李顺,晏致涛..下击暴流下输电塔时变响应分析及等效静力风荷载分析方法探讨[J].建筑钢结构进展,2025,27(10):91-103,13.基金项目
国家自然科学基金(52008070,52178458),重庆市教委科学技术研究项目(KJQN202501511),重庆市自然科学基金(CSTB2024NSCQ-MSX1135) （52008070,52178458）
