摘要
为识别台风作用下尤其是近登陆点输电线路沿线强风特性,提高输电线路抗风设计可靠性,开展近台风"米克拉"登陆点某输电线路附近30米高度处强风实测工作,全面研究了平均风速及风向、湍流强度及其尺度、阵风因子、功率谱等台风风场参数特性,探讨台风作用下输电线路风荷载设计参数取值规律。研究表明,本次台风登陆过程中,水平平均风速从低于20m/s迅速攀升至41.1m/s,伴随风向角完成约160°快速转变;台风登陆后强风阶段,湍流强度和阵风因子随平均风速增大而逐渐减小,变化范围分别为0.35~0.15和2.25~1.25;阵风因子与湍流强度、峰值因子存在递增变化规律,其中阵风因子与湍流强度之间关系可由石崎(Ishizaki)模型近似表示;湍流积分尺度随平均风速变化的离散性较大;各方向脉动风速功率谱与冯×卡门(Von-Karman)经验谱均吻合较好。DL/T 5551-2018计算给出的档距折减系数、导地线阵风响应系数可适度包络住台风41.1m/s最大风速对应的最不利结果。
In order to obtain features of strong wind near typhoon landing places around transmission lines and improve the wind-resisting design reliability, full-scale field measurements of strong wind at the height of 30 m near the typhoon ’Mekkhala’ landing place close to a transmission line were performed. The characteristics of wind load parameters, including mean wind velocities, wind directions, turbulence intensities, turbulence integral scales, gust factors and power spectra, were comprehensively studied. Moreover, the design parameter values of wire wind loads were examined. Results show that during the typhoon landfalling, the horizontal mean wind velocities rose rapidly from a low base less than 20 m/s to 41.1 m/s with sudden wind direction changes around 160°. In the strong wind phase after typhoon landing, the turbulence intensities and gust factors decreased from 0.35 to 0.15 and 2.25 to 1.25, respectively, with the increase of mean wind velocities. The relationships of gust factors corresponding to turbulence intensities and peak factors were progressive increases. The Ishizaki model was examined to be good to represent the changing pattern between gust factors and turbulence intensities. The dispersion of turbulence length scales was considerable. The power spectra calculated by field measurement data matched the Von-Karman empirical spectrum. The span factors and gust response factors of conductors and ground wires computed by DL/T 5551-2018 could moderately cover the most unfavourable results corresponding to the maximum mean wind velocity of 41.1 m/s.
作者
邵帅
张宏杰
潘峰
杨风利
王飞
SHAO Shuai;ZHANG Hongjie;PAN Feng;YANG Fengli;WANG Fei(China Electric Power Research Institute,Haidian District,Beijing 100192,China;Zhejiang Electric Power Design Institute Co.Ltd.,China Energy Engineering Group,Hangzhou 310012,Zhejiang Province,China)
出处
《中国电机工程学报》
EI
CSCD
北大核心
2021年第13期4698-4709,共12页
Proceedings of the CSEE
基金
国家电网公司总部科技项目(GCB17201700135)。
关键词
输电线路
台风风荷载参数
设计风荷载
风场实测
抗风设计
transmission line
wind field parameters of typhoon
design wind loads
full-scale wind field measurement
wind-resisting design
