输电塔线耦合体系的风振疲劳时域分析
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摘要
风荷载作用下的输电塔线结构属于非线性耦合振动体系,自然风的脉动分量使体系中的构件处于交替受力状态,从而可能导致构件的疲劳破坏.文中以某直流线路的一段塔线体系为例,提出了输电塔线体系的风振疲劳时域分析方法;采用AR模型产生了随机风场,对输电塔线耦合体系进行了非线性风振时程分析;建立了考虑风向和风速分布等因素影响的疲劳累积损伤计算公式;确定了输电塔结构中疲劳损伤的关键部位,针对关键部位进行了应力分析,并采用线性累积损伤理论对构件的风振疲劳寿命进行了评估.结果表明,文中提出的时域分析方法可有效估算输电塔结构在风振作用下的剩余寿命.
The transmission tower-line structure under wind loads is a nonlinear coupled vibration system.Its members alternately undergo reversal stress due to the flutter component of the natural wind,which may result in the fatigue damage of the structure.In this paper,with a direct-current transmission line as a case,a method to analyze the wind-induced fatigue in time domain is proposed for the vibration of transmission tower-line system.Then,the random wind field is simulated by using the AR model,and the nonlinear time-history wind-induced vibration of the tower-line coupling system is analyzed.Moreover,an equation to calculate the fatigue cumulative damage affected by the distributions of wind direction and speed is established,and the dangerous members with potential fatigue cumulative damage are determined,followed by a detail stress analysis.Finally,the fatigue life of the members under wind loads is estimated based on the linear cumulative damage theory.It is found that the proposed time-domain analysis method can effectively estimate the residual life of the transmission tower in wind-induced vibration.
The transmission tower-line structure under wind loads is a nonlinear coupled vibration system.Its members alternately undergo reversal stress due to the flutter component of the natural wind,which may result in the fatigue damage of the structure.In this paper,with a direct-current transmission line as a case,a method to analyze the wind-induced fatigue in time domain is proposed for the vibration of transmission tower-line system.Then,the random wind field is simulated by using the AR model,and the nonlinear time-history wind-induced vibration of the tower-line coupling system is analyzed.Moreover,an equation to calculate the fatigue cumulative damage affected by the distributions of wind direction and speed is established,and the dangerous members with potential fatigue cumulative damage are determined,followed by a detail stress analysis.Finally,the fatigue life of the members under wind loads is estimated based on the linear cumulative damage theory.It is found that the proposed time-domain analysis method can effectively estimate the residual life of the transmission tower in wind-induced vibration.
引文
[1]中华人民共和国电力行业标准.架空送电线路杆塔结构设计技术规定DL/T5154—2002[S].北京:中国电力出版社,2002.
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[12]阎楚良,卓宁生,高镇同.雨流法实时计数模型[J].北京航空航天大学学报,1998,24(5):623-624.Yan Chu-liang,Zhuo Ning-sheng,Gao Zhen-tong.Modelof rain-flow real-time counting method[J].Journal ofBeijing University of Aeronautics and Astronautics,1998,24(5):623-624.
[13]董乐义,罗俊,程礼.雨流计数法及其在程序中的具体实现[J].航空计测技术,2004,24(3):38-40.Dong Le-yi,Luo Jun,Cheng Li.Rain flow count methodand its realization in programming[J].Aviation Metro-logy&Measurement Technology,2004,24(3):38-40.
[2]王世村,孙炳楠,叶尹.自立式单杆输电塔顺风向风振疲劳分析[J].浙江大学学报:工学版,2005,39(12):1880-1884.Wang Shi-cun,Sun Bing-nan,Ye Yin.Analysis on along-wind fatigue of free-standing single rod transmission tower[J].Journal of Zhejiang University:Engineering Science,2005,39(12):1880-1884.
[3]黄健.桅杆结构随机风振疲劳及控制研究[D].上海:同济大学土木工程学院,2004.
[4]瞿伟廉,王锦文,谭亚,等.基于疲劳累积损伤的输电塔结构剩余寿命估算[J].武汉理工大学学报,2007,29(1):149-152.Qu Wei-lian,Wang Jin-wen,Tan Ya,et al.Transmissiontower s residual life prediction based on fatigue cumula-tive damage[J].Journal of Wuhan University of Techno-logy,2007,29(1):149-152.
[5]舒新玲,周岱.风速时程AR模型及其快速实现[J].空间结构,2003,9(4):27-32.Shu Xin-ling,Zhou Dai.AR model of wind speed time se-ries and its rapid implementation[J].Spatial Structures,2003,9(4):27-32.
[6]李元齐,董石麟.大跨度空间结构风荷载模拟技术研究及程序编制[J].空间结构,2001,7(3):3-11.Li Yuan-qi,Dong Shi-lin.Random wind simulation andcomputer program for large-span spatial structures[J].Spatial Structures,2001,7(3):3-11.
[7]曾宪武,韩大建.大跨度桥梁风场模拟方法对比研究[J].地震工程与工程振动,2004,24(1):135-140.Zeng Xian-wu,Han Da-jian.A comparative study on simu-lation methods for wind field of long-span bridges[J].Earthquake Engineering and Engineering Vibration,2004,24(1):135-140.
[8]Yasui H,Marukawa H,Momomura Y,et al.Analyticalstudy on wind-induced vibration of power transmissiontowers[J].Journal of Wind Engineering and IndustrialAerodynamics,1999,83:431-441.
[9]Ronaldo C B,Rosangcla S R,Michele S P.Dynamic be-havior and stability of transmission line towers under windforces[J].Journal of Wind Engineering and IndustrialAerodynamics,2003,91:1051-1067.
[10]郭勇,孙炳楠,叶尹.大跨越输电塔线体系风振响应的时域分析[J].土木工程学报,2006,39(12):12-17.Guo Yong,Sun Bing-nan,Ye Yin.Time-domain analysison wind-induced dynamic response of long span powertransmission line systems[J].China Civil EngineeringJournal,2006,39(12):12-17.
[11]姚卫星.结构疲劳寿命分析[M].北京:国防工业出版社.2003.
[12]阎楚良,卓宁生,高镇同.雨流法实时计数模型[J].北京航空航天大学学报,1998,24(5):623-624.Yan Chu-liang,Zhuo Ning-sheng,Gao Zhen-tong.Modelof rain-flow real-time counting method[J].Journal ofBeijing University of Aeronautics and Astronautics,1998,24(5):623-624.
[13]董乐义,罗俊,程礼.雨流计数法及其在程序中的具体实现[J].航空计测技术,2004,24(3):38-40.Dong Le-yi,Luo Jun,Cheng Li.Rain flow count methodand its realization in programming[J].Aviation Metro-logy&Measurement Technology,2004,24(3):38-40.
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