02-大跨越输电塔－线体系风致抖振时域分析.docVIP

大跨越输电塔－线体系风致抖振时域分析 尹 鹏 李 黎 胡 亮 （华中科技大学土木工程与力学学院，华中科技大学控制结构湖北省重点实验室， 武汉 430074） 【摘要】对于高柔大跨越输电塔线体系这样的大型结构体系，强风和地震引起的体系响应，尤其是动力响应将十分显著，常常成为其结构设计的控制性因素。塔坪桥直线跨越塔左岸呼高105米，全高116.5米；右岸呼高146米，全高157.5米，采用耐－直－直－耐跨越形式，跨越档距为523－1514（主跨）－349，为高柔的风敏感结构，有必要对其抗风性能进行分析。使用大型通用有限元软件ANSYS建立了塔坪桥大跨越输电塔的有限元模型，分析了模型的动力特性，根据Geodatis改进型的谱表示法模拟了随机脉动风速场并进行了检验，然后基于准定常理论计算了作用在模型上的抖振力时程，最后由时程分析分别求得了抖振时域分析的结果，得到了若干结论。分析结果为塔坪桥大跨越输电塔的抗风设计提供了依据，可供同类工程设计参考。 【关键词】大跨越风场模拟抖振时域分析 中图分类号：TU 311. 3，TM 753 文献标识码：A TIME DOMAIN WIND－INDUCED BUFFETING ANALYSIS OF ELECTRICAL TRANSMISSION TOWER－LINE SYSTEM WITH GREAT SPAN Li L Yin Peng Li Li Hu Liang （School of Civil Engineering Mechanics, Huazhong University of Sci. Tech., Hubei key Laboratory of Control Structure, Huazhong University of Sci. Tech., Wuhan 430074） Abstract：System response aroused by strong wind and earthquake would be extremely notable for the high and flexible electrical transmission tower－line system with great span, which makes it become the control factor of its structural design. Taping－bridge－electrical transmission is a tower－line system with great span. Its left tower is 105 meters in the recognized height, and 116.5 meters in total, while the right tower is 146 and 157.5 meters. The form of crossing over is Able to bear －Straight －Straight －Able to bear, it is 523－1514main span） to cross over the distance－ 349. The structure of the system is super flexible and wind－sensitive so that analysis of wind－resistant capacity of the system must be performed. By using general finite element analysis （FEA） software ANSYS, the finite element models of the Taping－bridge electrical transmission tower－line system with a big span is established，and the dynamic characteristic analysis of the model is done. The turbulent stochastic wind－velocity field of the system is simulated and checked by introducing the Geodatis－innovated spectral representation method. Then, the buffeting time－history force, which will be applied on the model, is compu