广东沿海地区桥址风场特性实测研究

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中图分类号：U44.2 文献标志码：A DOI：10.16385/j.cnki.issn.1004-4523.202308019

Abstract：Combinedwiththelong-termobservationdataofthre-dimensionalultrasonicanemometeratthedeckofalongspansus pensionbridgeinthecoastalareaofGuangdongProvince，theaveragewindcharacteristicsof thewindfieldatthebridgesiteare statistically analyzed. Taking the wind speed exceeding 8m/s as'the standard of strong wind，the fluctuating wind characteristics of thebridgsiteareanalyzedbasedonstrongwindsamples.TheresultsshowthatthecoastalareasofGuangdongaremainlyffected bythesoutheastmonsoon in spring and summerand thenorthweststrong windinautumnand winter.Thedownwind turbulence intensityisobviouslygreaterthanthetransverseindandverticalturbulenceintensity，andtheratioofeachcomponentisoughly Iu ：There is a significant positive correlation between gust factor and turbulence intensity，and the empirical for mularecommendedbyCaoandChoicanbeterreflect therelationshipbetweenthetwo，andtheempiricalformularecommended byCaoismoresuitableforcoastalareas.Turbulenceintegralscalehasanegativecorelationwithturbulenceintensity.Withthe increaseofturbulenceintensity，turbulenceintegralscalefirstdecreasesrapidlyandthentendstobestable.Basedonthemeasured data，theempiricalformulaofturbulenceintegralsaleandturbulenceintensityisgiven，andthecorelationbetweenthetwoissig nificant.Inthe measureddata，thedownwind powerspectraldensityisingoodagrement withKaimal spectrum，thetransverse wind powerspectraldensityis ingoodagreement withVonKarmanspectrum，ndtheverticalpowerspectraldensityiingood agreement with Panofsky spectrum at high frequency band.

Keywords：long-span bridge；windfield measurement;wind characteristics;sample ofstrong wind;relevance;coastalarea

现代桥梁设计正不断朝着大跨、轻柔的方向发展，桥梁结构对风的敏感性也在不断增加，自从1940年Tacoma大桥风毁之后，桥梁工程界开始逐渐重视风对桥梁结构的影响。（剩余13046字）