大跨度拱桥矩形拱肋静风阻力研究

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1、桥梁建设2014年第44卷第5期(总第228期)BridgeConstruction，Vo1．44，No．5，2014(TotallyNo．228)33文章编号：1003—4722(2014)05—0033—06大跨度拱桥矩形拱肋静风阻力研究郑史雄，唐煜(西南交通大学土木工程学院，四川成都610031)摘要：针对拱桥矩形拱肋静风阻力传统计算方法的不足，给出更合理的拱肋阻力计算方法。采用计算流体动力学(CFD)数值模拟方法及流场显示技术，计算分析二维拱肋截面阻力系数与三维曲拱肋阻力系数，并对某实际大跨度拱桥的缩尺模型进行N,N试验，分节段测试其静风阻力。结果表明：高宽比对阻力系数影

2、响不明显；阻力系数随拱肋间距比的增大存在跳跃现象，对二维拱肋截面该跳跃区间为3

3、i—xiong，1NGl(SchoolofCivilEngineering，SouthwestJiaotongUniversity，Chengdu610031，China)Abstract：Inviewofthedeficiencyoftheconventionalcomputationmethodsforaerostaticdragforcesontherectangulararchribsoflongspanarchbridge，amorereasonablecomputationmethodfortheaerostaticdragforcesisgivenherewith．

4、Inthenewmethod，thenumericalsimula—tionmethodofthecomputationalfluiddynamics(CFD)andtheflowvisualizationtechniquewereusedtocomputeandanalyzethesectiondragforcecoefficientsofthe2-dimensional(2一D)archribsandthedragforcecoefficientsofthe3-dimensionaI(3一D)curvedarchribs，thewindtunneItestforthescal

5、ed—downmodelofanactuallongspanarchbridgewasmadeandtheaerostaticdragforcesonthemode1weremeasuredinsegments．TheresultsshowthatthesectionasDectra—tio(H／B)doesnothavemuchimpactonthedragforcecoefficients．Thedragforcecoefficientspresentthephenomenonofjumpwiththeincreaseofthearchribspacingratio(S／H)

6、．Forthesectionofa2-Darchrib，thespaceintervaIofthejumpis3

7、forcecoefficientofthe2一Darchrib，thevaluewillbeobviouslylittlewhileifcomputedaccordingtothecode，thevaluewillbetooconse卜vativeanditisthereforeproposedthatinthedesign，theaerostaticdragforcesshouldbecompu—ted，usingthedragforcecoefficientsofthe3-D