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下击暴流的特征及其对输电线塔风致倒塌的影响

, PP. 120-126

Keywords: 下击暴流,输电线塔,风场特征,破坏特征,抗风设计

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Abstract:

下击暴流为雷暴天气中强下沉气流猛烈冲击地面后形成并沿地面传播的近地面短时强风,其风场特征同传统的大气边界层近地风显著不同。近年来下击暴流作用下输电线-塔结构的倒塌破坏事故层出不穷。根据美国、澳大利亚和南非等国的调查,80%以上的输电线-塔的风致倒塌事故主要为下击暴流所引起。而我国对此却少有研究。据此,本文简要介绍了下击暴流在输电线-塔抗风研究中的重要性,并从尺度特征、风速特征、随机特征和压力特征四个方面对下击暴流的基本特征进行了综述。其次,阐述了下击暴流对输电线-塔结构的灾害作用和下击暴流作用下输电线-塔的破坏特征。最后,论述了下击暴流对输电线-塔结构抗风设计的影响。指出了将雷暴强风,尤其是发生频度高、破坏性强的下击暴流纳入到风荷载规范,是非常重要而迫切的工作。

References

[1]  Shehata A Y,ElD amatty A A.Finite elementmodeling of transmission lineunder downburst windloading[J].Finite Elements in Analysis and Design,2005,42(1):71-89.
[2]  Shehata A Y,ElD amatty A A.Assessm ent of the failure of an electrical transmission line due to a downburst event[C] Proceedings of the 2006 Electrical Transmission Conference,ASCE,Irmingham,AL(US),2006.
[3]  Shehata A Y,ElD amatty A A.Behaviour of guyed transmission line structu resunder downburst wind loading[J].Wind and Structures,An International Journal,2007,10(3):249-268.
[4]  Shehata AY,Nassef AO,ElD amatty A A.Acoupled finite elem entoptimization technique to determ inecrit icalm icrobu rst param eters for trans-mission towers[J].Finite Elements in Analysis and Design,2008,45(1):1-12.
[5]  Sh ehata A Y,ElD amatty A A.Failure analys is of at ransm ission tower during amicroburst[J].Wind and Structures,2008,11(3):193-208.
[6]  王昕,楼文娟,徐伟.雷暴冲击风对输电塔的作用特征[J].华中科技大学学报:城市科学版,2008,25(4):10-14.
[7]  Homles JD,Baker CJ,English EC,etal.Wind stru cture and codification[J].Wind and Structures,2005,8(4):235-250.
[8]  Homles J D.Developm ent of codification of wind loads in the Asia-Pacific[C] Proceedings of The Seventh Asia-Pacific Conference on Wind Engineering,Taipei 2009:161-169.
[9]  Choi E C C.Proposal for unified terra in categories exposures and velocityprofiles[C] Proceedings of The Seventh Asia-Pacific Conference on Wind Engineering,Taipei,2009:871-874.
[10]  Kareem A.The change dynamics of aerodynamics:newfrontiers[C] Proceedings of The Seventh Asia-Pacific Conference on Wind Engineering,Taipei,2009:41-73.
[11]  Fujita T T.Manual of downbursti dentification forproject NIMROD[R].SMRPR esearch Paper 156,University of Chicago,104pp.[NTISPB-286048] ,1978.
[12]  Proctor F H.Numerica lsmiulations of anisolated microburst.Part:Idynamics and structure[J].Journal of the A tmospheric Sciences,1988,45(21):3137-3160.
[13]  谢强,张勇,李杰.华东电网500kV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.
[14]  Dempsey D,White H.Windswreak havoc on lines[J].Transmission and Distribution World,1996,48(6):32-37.
[15]  Mc Carthy J,Wilson JW,Fujita T T.The joint airportweather studies[J].American Meterological Society,1982,63(1):15-22.
[16]  James W W,Wendy E.Schreiber.Initiation of convective storms byradar-observed boundary layer convergen lines[J].Monthly Weather Review,1986,114(12):2516-2536.
[17]  Hjelmfelt M R.Structure and lifecircle of microburst outflows observed in Colorado[J].J.Appl Meteoro,l1988,27(8):900-927.
[18]  Fujita T T.DFW microburst on August 2,1985[R].Satellite and Mesom eteorology Research Project,Research Paper No.217,University of Chicago,1985:150.
[19]  Fujita T T.The downburst Microburst and macroburst[R].SMRP Research Paper 210,University of Chicago,[NTISPB85-148880] ,1985:122.
[20]  Oliver SE,Holmes JD,Moriarty W W.The characteristics of severe thunderstorm winds in Australia in relation to transmission linefailures[R].Bureau of Meteorology,Special Services Unit.Final Report1997.
[21]  瞿伟廉,吉柏锋,王锦文.下击暴流风与大气边界层风的风剖面特征比较研究[C].第十四届全国结构风工程学术会议论文集,2009:101-109.
[22]  Chen L,Letchford C W.A Determ in istic-stochastic hybirdmodel of downbursts and Itsmipact on acan tilevered structure[J].Engineering Structu res,2004,26(5):619-629.
[23]  Hawes H,Dempsey D.Review of recent A ustralian transmission linefailuresdue to highintensity winds[C] Proceedings of the taskforce of high in tensity winds on transmission lines,Buenos Aires,1993:19-23.
[24]  Mc C arthy P,Melsness M.Severe weatherelements associated with September 5,1996 hydro tower failures near Grosse Isle,Manitoba,Canada[R].Manitoba Environmental Service Centre,Environment Canada,1996:21.
[25]  王锦文,瞿伟廉.下击暴流风作用下输电线-塔结构倒塌破坏的特征分析[C] 第十四届全国结构风工程学术会议论文集,2009:395-400.
[26]  Savory E,Parke G A R,Zeinodd in iM ,etal Modelling of tornado and microburs-tinduced wind loading and failure of alattice transmission tower[J].Engineering Structures,2001,23(4):365-375.
[27]  李春祥,李锦华,于志强.输电塔线体系抗风设计理论与发展[J].振动与冲击,2009,28(10):15-25.
[28]  American Society of Civil Engineers.Guidelines for transm ission line stru ctural load ing[S].A.S.C.E.,Y ork:A SCE Manual and Reports on Engineering Practice No.74.Peer Review Draft,2006.
[29]  Standards Australia/Energy Networks Australia.Guidelines for design and maintenance of overheadd istribution and tran smission lines[S].ENAC(b)1-2006.
[30]  Holmes J D.Recent developments in the specification of windloads on transm issionlines[J].Journal of Wind and Engineering,2008,5(1):8-18.
[31]  ISO:FDIS4354:2008(E)Windactions on structures[S].2008.

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