摘要
基于文献资料确定了工程所在地区的良态风场和台风风场参数。采用离散刚度法制作了五塔四线输电塔线体系气弹模型,开展了紊流场中多种风速、多个风向角下单塔及塔线体系气弹模型风洞试验。比较了良态风场和台风风场下单塔及塔线体系的风振响应和风振系数。研究结果表明:台风风场下单塔及塔线体系的位移均值和加速度根方差均大于良态风场,试验风速为7 m/s时位移差值分别为20%(单塔)和30%(塔线体系)左右,加速度根方差的差值分别为50%(单塔)和100%(塔线体系)左右;台风风场下输电塔的风振系数比良态风场下大7%以上。因此台风区输电线路设计要注意台风风场的高湍流特性对风振响应和风荷载的放大作用。
Wind field parameters of normal wind field and typhoon wind field were determined in accordance with references.An aeroelastic model of a tower-line system consisted of five towers and four lines was designed with the discrete stiffness method.Then wind tunnel tests at various wind speeds and incident angles were conducted and wind-induced response and wind vibration coefficient of the transmission tower and tower-line system were compared.Test results show that mean displacement and RMS acceleration under typhoon wind field are larger than those under normal wind filed.When test wind speed is about 7 m/s,the differences of mean displacement are approximately 20%for transmission tower and 30%for the tower-line system,while the differences of RMS acceleration are respectively 50%and 100%.Wind vibration coefficient under typhoon wind field is more than 7%larger than that under normal wind field.Thus the influence of high turbulence characteristics of typhoon wind field on the magnification of wind-induced response and wind load should be noticed in designing transmission tower-line systems in typhoon regions.
作者
邓洪洲
段成荫
徐海江
DENG Hongzhou;DUAN Chengyin;XU Haijiang(Department of Structural Engineering,Tongji University,Shanghai 200092,China)
出处
《振动与冲击》
EI
CSCD
北大核心
2018年第8期257-262,共6页
Journal of Vibration and Shock
基金
国家自然科学基金(51578421)
关键词
输电塔线体系
台风风场
风洞试验
气弹模型
风振响应
transmission tower-line system
typhoon wind field
wind tunnel test
aeroelastic model
wind-induced response
