考虑实际风速的输电塔疲劳寿命分析
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摘要
风致振动是引起输电塔破坏的主要原因之一,为了研究极端大风区域设计基准期内输电塔在实际风荷载作用下是否会发生疲劳破坏,选取750kV吐鲁番—哈密一线的7A5-J1型耐张塔作为研究依据,研究了沿线风速的分布,采用自回归线性滤波法结合Davenport风速谱编写程序模拟了脉动风速时程,并利用Miner线性累积损伤理论结合材料的S-N曲线建立了一套完整的实际风荷载作用下的输电塔疲劳寿命的计算方法,并以此计算了该线路沿线最不利位置的疲劳寿命。结果表明:该线路输电塔在设计基准期内不会出现疲劳破坏。提出的方法可用于输电塔疲劳设计。
Wind-induced vibration is an important reason of transmission tower damage.In order to research whether the transmission tower will suffer fatigue failure within design benchmark period in extreme gale areas,an integrated calculating method of transmission tower fatigue life is proposed in this paper under the condition of actual wind load based on Miner's linear cumulative damage theory and the S-N curve equation according to 750 kV 7 A5-J1 transmission tower of Turpan-Kumul.With this method,the distribution of wind speed is researched,and the simulation program of fluctuating wind speed is developed by using autoregressive linear filtering method(AR)and Davenport's wind speed spectrum.The fatigue life of the most dangerous transmission tower is calculated along the line.The result shows that the transmission tower will not damage due to fatigue within the design benchmark period along the way.The calculation method proposed in this paper can be applied in practical engineering projects.
Wind-induced vibration is an important reason of transmission tower damage.In order to research whether the transmission tower will suffer fatigue failure within design benchmark period in extreme gale areas,an integrated calculating method of transmission tower fatigue life is proposed in this paper under the condition of actual wind load based on Miner's linear cumulative damage theory and the S-N curve equation according to 750 kV 7 A5-J1 transmission tower of Turpan-Kumul.With this method,the distribution of wind speed is researched,and the simulation program of fluctuating wind speed is developed by using autoregressive linear filtering method(AR)and Davenport's wind speed spectrum.The fatigue life of the most dangerous transmission tower is calculated along the line.The result shows that the transmission tower will not damage due to fatigue within the design benchmark period along the way.The calculation method proposed in this paper can be applied in practical engineering projects.
引文
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[10]汪之松,李正良,肖正直,等.输电塔线耦合体系的风振疲劳时域分析[J].华南理工大学学报(自然科学版),2010,38(4):106-111.DOI:10.3969/j.issn.1000-565X.2010.04.020.WANG Zhisong,LI Zhengliang,XIAO Zhengzhi,et al.Windinduced fatigue analysis in time domain for transmission tower-line coupling system[J].Journal of South China University of Technology(Natural Science Edition),2010,38(4):106-111.DOI:10.3969/j.issn.1000-565X.2010.04.020.(in Chinese)
[11]MATSUICHI M,ENDO T.Fatigue of metals subjected to varying stress[C]//Proceedings of the Japan Society of Mechanical Engineers.Fukuoka,Japan.1968:37-40.
[12]齐忠华.Miner疲劳损伤累积假说在谱状载荷中的应用[J].机械设计与制造,1997(2):34-35.QI Zhonghua.The application of Miner fatigue damage accumulation hypothesis in spectral loading[J].Machinery Design&Manufacture,1997(2):34-35.(in Chinese)
[2]张相庭.工程结构风荷载理论和抗风计算手册[M].上海:同济大学出版社,1990.ZHANG Xiangting.Wind load theory of engineering structure and manual of wind resistance calculation[M].Shanghai:Tongji University Press,1990.(in Chinese)
[3]张培信.建筑结构与风荷载[M].上海:上海科学技术出版社,2013.ZHANG Peixin.Wind loads on buildings and structures[M].Shanghai:Shanghai Science&Technology Publishers,2013.(in Chinese)
[4]中华人民共和国住房和城乡建设部.建筑结构荷载规范:GB50009-2012[S].北京:中国建筑工业出版社,2012.Ministry of Housing and Urban-Rural Development of the People’s Republic of China.Load Code for the Design of Building Structures:GB 50009-2012[S].Beijing:China Architecture&Building Press,2012.(in Chinese)
[5]DAVENPORT A G.The application of statistical concepts to the wind loading of structures[J].Proceedings of the Institution of Civil Engineers,1961,19(4):449-472.DOI:10.1680/iicep.1961.11304.
[6]何艳丽.空间结构风工程[M].上海:上海交通大学出版社,2012.HE Yanli.Wind engineering of space structure[M].Shanghai:Shanghai Jiao Tong University Press,2012.(in Chinese)
[7]唐士晟,史永革,张小勇.新疆铁路百里风区大风特征统计分析[J].铁道技术监督,2011,39(1):36-40.TANG Shicheng,SHI Yongge,ZHANG Xiaoyong.Statistical analysis on characteristics of the strong wind along the100km-long wind area in Xinjiang region[J].Railway Quality Control,2011,39(1):36-40.(in Chinese)
[8]李锁平.哈密至将军庙铁路大风观测与研究[J].铁道建筑,2014(5):150-153.LI Suoping.Observation and study on big wind towards Hami-Jiangjunmiao railway[J].Railway Engineering,2014(5):150-153.(in Chinese)
[9]阿尼尔·卡拉帕,道然·加帕依.东疆大风的统计分析[J].沙漠与绿洲气象,2008(3):41-43.Anier.Kalapa,Daoran.Jiapayi.Statistical analysis of the gale in Eastern Xinjiang[J].Desert and Oasis Meteorology,2008(3):41-43.(in Chinese)
[10]汪之松,李正良,肖正直,等.输电塔线耦合体系的风振疲劳时域分析[J].华南理工大学学报(自然科学版),2010,38(4):106-111.DOI:10.3969/j.issn.1000-565X.2010.04.020.WANG Zhisong,LI Zhengliang,XIAO Zhengzhi,et al.Windinduced fatigue analysis in time domain for transmission tower-line coupling system[J].Journal of South China University of Technology(Natural Science Edition),2010,38(4):106-111.DOI:10.3969/j.issn.1000-565X.2010.04.020.(in Chinese)
[11]MATSUICHI M,ENDO T.Fatigue of metals subjected to varying stress[C]//Proceedings of the Japan Society of Mechanical Engineers.Fukuoka,Japan.1968:37-40.
[12]齐忠华.Miner疲劳损伤累积假说在谱状载荷中的应用[J].机械设计与制造,1997(2):34-35.QI Zhonghua.The application of Miner fatigue damage accumulation hypothesis in spectral loading[J].Machinery Design&Manufacture,1997(2):34-35.(in Chinese)