三维新月形变截面覆冰斜拉索气动力特性研究.pdf

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1、第３４卷第３期建筑科学与工程学报Vol．３４No．３２０１７年５月JournalofArchitectureandCivilEngineeringMay２０１７文章编号：１６７３‐２０４９（２０１７）０３‐００６６‐０７三维新月形变截面覆冰斜拉索气动力特性研究谭冬梅，王凯丽，瞿伟廉（武汉理工大学道路桥梁与结构工程湖北省重点实验室，湖北武汉４３００７０）摘要：为研究变截面覆冰对斜拉索气动力特性的影响，应用FLUENT中的SSTk模型对三维新‐ω月形变截面覆冰斜拉索绕流场进行数值模拟；将变截面覆冰斜拉索模型划分为６个节段，分别监

2、测不同覆冰厚度节段的气动力，得到全攻角下各节段以及全索的阻力系数和升力系数；基于DenHartog机制，获得驰振力系数，进而研究变截面覆冰斜拉索的驰振稳定性。结果表明：变截面覆冰形态对斜拉索的流场分布影响较大，其绕流场具有明显的三维流动特性；由于覆冰厚度的变化，变截面覆冰斜拉索各节段表现出不同的气动力特性和驰振稳定性；经过三维模拟计算，变截面覆冰斜拉索各节段及全索的部分驰振力系数小于０，拉索具有发生覆冰驰振的可能性，变截面覆冰对斜拉索的气动力特性影响较大。关键词：变截面；覆冰；斜拉索；气动力参数；驰振中图分类号：TU３１１．

3、３文献标志码：AStudyonAerodynamicCharacteristicsof3DVariableCross‐sectionStayCableswithCrescent‐shapeIceAccretionTANDong‐mei，WANGKai‐li，QUWei‐lian（HubeiKeyLaboratoryofRoadwayBridge&StructureEngineering，WuhanUniversityofTechnology，Wuhan４３００７０，Hubei，China）Abstract：Inorderto

4、investigatetheinfluenceofvariablecross‐sectioniceaccretionontheaerodynamiccharacteristicofstaycables，theflowfieldof３Dvariablecross‐sectionstaycableswithcrescent‐shapeiceaccretionwasnumericalsimulatedbySSTkmodelofFLUENT．Themodelofvariablecross‐sectionstaycableswithi

5、ceaccretionwasdividedintosixsegments，andtheaerodynamicforcesofthesegmentswithdifferenticeaccretionthicknessesweremonitored．Thedragandliftcoefficientsofeachsegmentandthewholestaycableunderfullattackanglewereobtained．ThegallopingcoefficientswereobtainedbasedonDenHart

6、ogcriterion，andthegallopingstabilityofvariablecross‐sectionstaycableswithiceaccretionwasstudied．Theresultsshowthattheshapeofvariablecross‐sectioniceaccretionhasimportantimpactontheflowfieldofstaycables，andtheflowfieldhasobvious３Dflowcharacteristics．Eachsegmentofvar

7、iablecross‐sectionstaycableswithiceaccretionexhibitsdifferentaerodynamicforcecharacteristicsandgallopingstabilityduetothechangeoficeaccretionthickness．Partofgallopingforcecoefficientsofvariablecross‐sectionstaycableswithiceaccretioncomputedby３Dsimulationarelessthan

8、zero，sothestaycableshavethepossibilityoficinggalloping．Thevariablecross‐sectioniceaccretionhasimportantimpactonaerodynamiccharacteristicsofstayca