非稳态冲击风下输电塔风致振动特性研究  

STUDY ON WIND-INDUCED VIBRATION CHARACTERISTICS OF TRANSMISSION TOWER UNDERNON-STATIONARY DOWNBURST

作　　者：张哲铨 许金一 潘泽昊 ZHANF Zhequan;XU Jinyi;PAN Zehao(Institute of Structural Engineering,Zhejiang University,Hangzhou 310058,China)

机构地区：[1]浙江大学结构工程研究所,杭州310058

出　　处：《低温建筑技术》2023年第9期124-127,131,共5页Low Temperature Architecture Technology

摘　　要：为研究非稳态冲击风作用下输电塔所受到的风荷载而引起的峰值响应,采用时域分析的方法来获得输电塔在冲击风载荷下的风致振动。为提高计算效率,文中采用谐和叠加法,结合FFT算法生成了冲击风的脉动风速时程,研究输电塔在不同高度处的风致振动,并与GB 50545—2010规范的常规风进行了比较。模拟计算的结果显示输电塔在非稳态冲击风作用下的位移和加速度的峰值响应远超常规风条件下的响应。文中展示了输电塔风致振动的特性,研究结果可为输电塔设计提供参考。In order to study the peak response of transmission towers subjected to wind loads caused by gusty winds under non-stationary downburst,a time-domain analysis method is employed to obtain the wind-induced vibrations coefficient of the towers.To improve computational efficiency,this study adopted the harmonic superposition method and combined it with the FFT algorithm to generate the pulsating wind speed time history for gusty winds.The wind-induced vibrations of the transmission towers at different heights are investigated and compared with the con⁃ventional wind conditions specified in the Chinese standard GB 50545—2010.The simulated results demonstrated that the peak displacements and accelerations of the transmission towers under gusty winds in non-stationary down⁃burst far exceeded those under conventional wind conditions.The characteristics of wind-induced vibration of trans⁃mission tower are obtained and the results revealed can be used as the reference for the design of transmission tower.

关 键 词：非稳态冲击风 输电塔 风荷载模拟时域分析 风致振动系数 

分 类 号：TU311.3[建筑科学—结构工程]