输电铁塔结构强风仿真分析研究
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摘要
采用谐波合成法(WAWS)生成脉动风速时程,并根据输电铁塔结构的空间结构特点生成输电铁塔的脉动风振荷载,利用有限元软件Power Tower和ANSYS进行输电铁塔结构的强风仿真分析,研究了不同风速、风向和阻尼比情况下输电铁塔结构的风振响应。研究结果表明,随着风速的提高,输电铁塔的位移和轴力响应不断变大,风速的大小、风向对输电铁塔结构的响应影响很大,阻尼比对输电铁塔结构的响应影响较小。
The weighted amplitude wave superposition method(WAWS) was used to simulate wind speed time series,and the pulsating wind vibration load was generated according to the characteristic of the spatial structure of the transmission tower. The finite element programs Power Touer and ANSYS were used to conduct strong wind simulation analysis of transmission tower structure. The wind-induced vibration responses of the transmission tower under different wind speed,wind direction and damping ratio were studied. The results show that with the increase of wind speed,the displacement and axial force response of the transmission tower become larger and larger. The wind speed and wind direction greatly influence the response of the transmission tower structure. The influence of damping ratio on the response of the transmission tower structure is small.
The weighted amplitude wave superposition method(WAWS) was used to simulate wind speed time series,and the pulsating wind vibration load was generated according to the characteristic of the spatial structure of the transmission tower. The finite element programs Power Touer and ANSYS were used to conduct strong wind simulation analysis of transmission tower structure. The wind-induced vibration responses of the transmission tower under different wind speed,wind direction and damping ratio were studied. The results show that with the increase of wind speed,the displacement and axial force response of the transmission tower become larger and larger. The wind speed and wind direction greatly influence the response of the transmission tower structure. The influence of damping ratio on the response of the transmission tower structure is small.
引文
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[3]谢强,张勇,李杰.华东电网500 k V任上5237线飑线风致倒塔事故调查分析[J].电网技术,2006,30(10):59-63,89.
[4]郭勇,孙炳楠,叶尹,等.大跨越输电塔线体系风振响应频域分析及风振控制[J].空气动力学学报,2009,27(3):288-295.
[5]杨文刚,王璋奇,朱伯文,等.特高压单柱拉线塔塔线体系风振响应时程分析[J].中国电机工程学报,2015,35(12):3182-3191.
[6]肖正直,李正良,汪之松,等.1000k V汉江大跨越塔线体系风洞实验与风振响应分析[J].中国电机工程学报,2009,29(34):84-89.
[7]杨风利,张宏杰,杨靖波,等.高压输电铁塔塔身背风面风荷载遮挡效应研究[J].振动工程学报,2016,29(2):276-283.
[8]肖正直.特高压输电塔风振响应及等效风荷载研究[D].重庆:重庆大学,2009.
[9]王飞.特殊环境杆塔结构仿真系统关键技术研究[C]//第二届全国智慧结构学术会议论文集.绵阳:2016.
[10]PAOLA M D.Digital simulation of wind field velocity[J].Journal of Wind Engineering&Industrial Aerodynamics,1990,74-76(2):829-843.
[11]DAVENPORT A G.How can we simplify and generalize wind loads[J].Journal of Wind Engineering&Industrial Aerodynamics,1995,54(94):657-669.
[12]DEODATIS G.Simulation of ergodic multivariate stochastic processes[J].Engineering Mechanics,ASCE,122(8),1996:778-787.