海岛大跨越输电塔线体系风振响应及风振系数

Wind Induced Vibration Response and Coefficient of Large Crossing Transmission Tower Line System Between Islands

以2020年"黑格比"台风中倒塔的海岛大跨越塔线体系为研究对象,分析了"黑格比"台风对洞头海岛电网的影响,采用Ansys建立了裸塔及塔线体系的有限元模型,分析了裸塔和塔线体系的动力特性。其次,结合现有规范开展了输电塔线体系风荷载静力加载及脉动风速时程拟合方法研究,分别开展了0°、90°等风向角下静力分析和动力时程分析,得到了裸塔、塔线体系中输电塔位移、主材应力静载响应和风振响应,不仅对比分析了裸塔、塔线体系输电塔的风荷载静载效应与考虑脉动风的风振响应,还对比了不同风向角对输电塔风载效应的影响。此外,还采用频域分析方法开展了输电塔风载效应的功率谱分析,进一步揭示了脉动风的荷载效应及导地线的耦合效应。最后,基于输电塔位移响应开展了裸塔、塔线体系输电塔的位移风振系数分析。研究及其相关结论对今后开展输电塔抗风设计、加固具有重要的参考价值。

With the collapsed large crossing tower line system of the island in typhoon“Hagupi”in 2020 as the research object,the influence of typhoon“Hagupi”on Dongtou island power grid is analyzed.The finite element model of free-standing tower and tower line system is set up by Ansys and the dynamic characteristics of them are analyzed firstly.Then,the static load and fluctuating wind speed time history fitting method of transmission tower line system are studied in combination with the existing specifications.The static analysis and dynamic time history analysis at wind direction angles of 0°and 90°are carried out respectively.The static load response of the displacement and main material stress as well as wind vibration response of transmission tower in free-standing tower and tower line system are obtained.Not only the static load of wind load and wind induced vibration response considering fluctuating wind of bare tower and tower line system are compared and analyzed,but also the influence of different wind direction angle on the wind load effect of transmission tower is compared.In addition,the frequency domain analysis method is adopted to perform power spectrum analysis of wind load effect of transmission tower,which further reveals the load effect of fluctuating wind and the coupling effect of grounding wire.Finally,the wind-induced vibration coefficient of displacement of free-standing tower and tower line system is analyzed on the basis of displacement response of transmission tower.The research and related conclusions have important reference value for the wind resistance design and reinforcement of transmission tower in the future.