高压输电塔线体系风致非线性振动气弹模型风洞试验
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摘要
基于边界层风洞气弹模型试验的方法,对高压输电塔线耦联体系的风振响应进行了试验研究,首次在风洞中重现了输电塔线体系倒塔破坏现象.研究表明:在紊流风场中,高压输电塔线体系的风致振动呈现较强的非线性振动特征,随风速增加,非线性振动程度加剧,且输电塔结构振动呈现出混沌振动特征;由于输电线与绝缘子振动的影响,塔线体系中输电塔高阶模态的振动非常显著,且随风速增加,高阶模态的能量甚至强于低阶模态的能量;导地线与绝缘子对输电塔结构的影响随风速增加而增强.塔线体系的风振响应计算需考虑高阶模态的影响.结构设计时,需合理考虑大风时导地线与绝缘子的非线性振动对输电塔的影响.
Wind-induced dynamic behavior of a high-voltage transmission tower-line system is investigated through an aeroelastic model test in a boundary layer wind tunnel.Dynamic tower failure phenomena were reproduced in wind tunnel tests for the first time.Test results show that the wind-induced vibration of the tower-line coupling system is of a distinctive nonlinear characteristic.The higher the wind velocity is,the more distinctive the nonlinearity is.Chaos arises in the vibration of the tower structure as the wind velocity reaches certain value.The higher-order model vibration of the tower-line coupling system is remarkable and the energy of it is even stronger than that of the lower-order model.The influence of the wires and insulators to the wind responses of the tower enhances as the wind speed increases.The higher-order model vibrations should be considered when the wind-induced dynamic responses of the transmission tower are analyzed.The nonlinear vibration of the wires and insulators should also be considered while designing a transmission tower.
Wind-induced dynamic behavior of a high-voltage transmission tower-line system is investigated through an aeroelastic model test in a boundary layer wind tunnel.Dynamic tower failure phenomena were reproduced in wind tunnel tests for the first time.Test results show that the wind-induced vibration of the tower-line coupling system is of a distinctive nonlinear characteristic.The higher the wind velocity is,the more distinctive the nonlinearity is.Chaos arises in the vibration of the tower structure as the wind velocity reaches certain value.The higher-order model vibration of the tower-line coupling system is remarkable and the energy of it is even stronger than that of the lower-order model.The influence of the wires and insulators to the wind responses of the tower enhances as the wind speed increases.The higher-order model vibrations should be considered when the wind-induced dynamic responses of the transmission tower are analyzed.The nonlinear vibration of the wires and insulators should also be considered while designing a transmission tower.
引文
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[2]Ozono S,Maeda J.In-plane dynamic interaction between a tower and conductors at lower frequencies[J].Engineering Structures,1992,14:210.
[3]李宏男,石文龙,贾连光.考虑导线影响的输电塔侧向简化抗震计算方法[J].振动工程学报,2003,16(2):233.LI Hongnan,SHI Wenlong,JI ALianguang.Si mplified aseicmic calculation method considering effects of lines on transmission tower[J].Journal of Vibration Engineering,2003,16(2):233.
[4]梁枢果,朱继华,王力争.大跨越输电塔——线体系动力特性分析[J].地震工程与工程振动,2003,23(6):63.LI ANG Shuguo,ZHU Jihua,WANG Lizheng.Analysis of dynamic characters of electrical transmissiontower-line system with a big span[J].Earthquake Engineering and Engineering Vibration,2003,23(6):63.
[5]Okamuraa T,Ohkuma T,Hongo E,et al.Wind response analysis of a transmission tower in a mountainous area[J].Journal of Wind Engineering and Industrial Aerodynamics,2003,91:53.
[6]王世村,孙炳楠,楼文娟,等.单杆输电塔气弹模型风洞试验研究和理论分析[J].浙江大学学报:工学版,2005,39(1):87.WANG Shicun,SUN Bingnan,LOU Wenjuan,et al.Wind tunnel test and theoretical analysis on aeroelastic model of single-rod transmission tower[J].Journal of Zhejiang University:Engineering Science,2005,39(1):87.
[7]邓洪洲,朱松晔,陈晓明,等.大跨越输电塔——线体系气弹模型风洞试验[J].同济大学学报:自然科学版,2003,31(2):132.DENG Hongzhou,ZHU Songye,Chen Xiaoming,et al.Wind tunnel investigation on model of long span transmission line system[J].Journal of Tongji University:Natural Science,2003,31(2):132.
[8]郭勇,孙炳楠,叶尹,等.大跨越输电塔——线体系气弹模型风洞试验[J].浙江大学学报:工学版,2007,41(9):1482.GUO Yong,SUN Bingnan,YE Yin,et al.Wind tunnel test on aeroelastic model of long span transmission line system[J].Journal of Zhejiang University:Engineering Science,2007,41(9):1482.
[9]Loredo-Souza A M,Davenport A G.The effects of high winds on transmission lines[J].Journal of Wind Engineering and Industrial Aerodynamics,1998(74-76):987.
[10]Loredo-Souza A M,Davenport A G.Anovel approachfor wind tunnel modeling of transmission lines[J].Journal of Wind Engineering and Industrial Aerodynamics,2001(89):1017.
[11]Loredo-Souza A M,Davenport A G.Wind tunnel aeroelastic studies on the behavior of two parallel cables[J].Journal of Wind Engineering and Industrial Aerodynamics,2002(90):407.
[12]梁枢果,朱继华,谢强.输电塔线耦联体系风洞试验研究[R].上海:同济大学现代混凝土结构与生命线工程研究所,2005.LI ANG Shuguo,ZHUJihua,XIE Qiang.Wind tunnel test on transmission tower-line coupling system[R].Shanghai:Tongji University.Institute of Modern Reinforced Concrete Structures and Lifeline Engineering,2005.
[13]Irvine H M.Cable structures[M].Cambridge:MIT Press,1981.
[14]官德.气动弹性试验[M].北京:北京航空学院出版社,1986.GUAN De.Aeroelastic experi ment[M].Beijing:Beihang University Press,1986.
[15]伯野元彦.土木工程振动手册[M].北京:中国铁道出版社,1992.Bo Yeyuanyan.Civil engineering vibration handbook[M].Beijing:China Rail way Publishing House,1992.
[16]Si miu E,Scanlan R H.Wind effects on structures[M].New York:John Wiley&Sons,1986.
[17]赵桂峰,谢强,梁枢果,等.高压输电塔线体系抗风设计风洞试验研究[J].高电压技术,2009,35(5):1206.ZHAO Guifeng,XIE Qiang,LI ANG Shuguo,et al.Wind tunnel test on wind resistant design of high-voltage transmission tower-line coupling system[J].High Voltage Engineering,2009,35(5):1206.
[18]Nafeh A H,Mook D T.Nonlinear oscillations[M].New York:Wiley,1979.
[19]闻邦椿,李以农,徐培民,等.工程非线性振动[M].北京:科学出版社,2007.WEN Bangchun,LI Yinong,XU Pei min,et al.Engineering nonlinear vibrations[M].Beijing:Science Press,2007.
[20]谢强,钱摇琨,何涛,等.华东电网输电线路风致倒塔事故调查研究[R].上海:同济大学现代混凝土结构与生命线工程研究所,2005.XIE Qiang,QI AN Yaokun,HE Tao,et al.Investigation on wind-induced tower collapses of500kVtransmission lines of huadong china grid[R].Shanghai:Tongji University.Institute of Modern Reinforced Concrete Structures and Lifeline Engineering,2005.
[21]冯奇,沈荣瀛.工程中的浑沌振动[M].上海:上海交通大学出版社,1998.FENG Qi,SHEN Rongying.Engineering chaos vibrations[M].Shanghai:Shanghai Jiaotong University Press,1998.
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