钢箱梁在高低雷诺数下的涡振特性研究.pdf

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1、桥梁建设２０１６年第４６卷第５期（总第２４０期）BridgeConstruction，Vol．４６，No．５，２０１６（TotallyNo．２４０）６５文章编号：１００３－４７２２（２０１６）０５－００６５－０６钢箱梁在高低雷诺数下的涡振特性研究熊龙，孙延国，廖海黎（西南交通大学风工程四川省重点实验室，四川成都６１００３１）摘要：为研究钢箱梁涡振性能对雷诺数的敏感性，以某钢箱梁斜拉桥为背景，建立２种尺度（１∶５０和１∶２０）主梁节段模型，通过风洞试验对比分析高、低雷诺数下主梁涡振性能的差异，研究阻尼比对涡振性能的影响，采用数值模拟技术对差异性进行机理研

2、究，并评价其涡振性能。结果表明：阻尼比较小时，高低雷诺数试验均出现２个竖向涡振区；涡振振幅随着阻尼比的增加逐渐减小，当阻尼比达到某一值时，涡振消失；阻尼比大致相当时，高雷诺数模型的最大振幅对应锁定风速、涡振起振风速和止振风速均要高于低雷诺数的相应值；低雷诺数下断面周围旋涡能量较高雷诺数的大，模型周围旋涡多，强度大；阻尼比增至１．１６％时，涡振振幅可满足抗风设计要求。关键词：斜拉桥；钢箱梁；涡振；风洞试验；雷诺数；阻尼比中图分类号：U４４８．２７；U４４１．３文献标志码：AStudyofVortex‐InducedVibrationCharacteris

3、ticsofSteelBoxGirderatHighandLowReynoldsNumbersXIONGLong，SUNYanguo，LIAOHaili‐（KeyLaboratoryforWindEngineeringofSichuanProvince，SouthwestJiaotongUniversity，Chengdu６１００３１，China）Abstract：Tostudythesensitivityofthevortex‐inducedvibration（VIV）performanceofthesteelboxgirdertotheReynol

4、dsnumbers，asteelboxgirdercable‐stayedbridgewascitedasanex‐ampleandthesectionalmodelsofthetwodifferentscalesof１∶５０and１∶２０forthemaingirderofthebridgewereestablished．ThedifferencesoftheVIVperformanceofthemaingirderatthehighandlowReynoldsnumberswerecomparedandanalyzedthroughthewindt

5、unneltestsandthein‐fluencesofthedampingratiosontheVIVperformancewereinvestigated．ThemechanismofthedifferencesoftheVIVperformancewasstudied，usingthenumericalsimulationtechniquesandtheVIVperformancewasevaluated．Theresultsrevealthatwhenthedampingratiosarelittle，twoverticalVIVzonesa

6、ppearinthetestsatboththehighandlowReynoldsnumberandtheamplitudeoftheVIVgraduallydecreaseswiththeincreaseofthedampingratios．Whenthedampingratiosreachthecertainvalues，theVIVdisappears．Whenthedampingratiosareaboutequivalent，thelockedwindspeedandthestartingandstoppingwindspeedsofthe

7、VIVcorrespondingtothemax‐imumvibrationamplitudeofthehighReynoldsnumbermodelarehigherthanthecorrespondingvaluesofthelowReynoldsnumbermodel．ThevortexenergyaroundthesectionofthemodelatthelowReynoldsnumberisgreaterthanthatofthemodelatthehighReynoldsnumber，thevor‐texesaroundthemodels

8、aremanyandtheintensityofthevortexesisgreat．When