ⅡI型主梁斜拉桥抖振响应多因素分析

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关键词：斜拉桥；抖振；Ⅱ型主梁；风洞试验；均匀试验设计；回归分析 中图分类号： U441+.3 文献标志码：A DOI：10.16385/j.cnki.issn.1004-4523.202307065

Multi-factor analysis of buffeting response in cable-stayed bridge withII-shapedmain beam

DONG Rui1，23，，WANG Linkai1， GUO Yu1，，WENG Xiangying4 （1.College of Civil Engineering，Fuzhou University，Fuzhou 35O1O8，China;

2.State Key Laboratory of Bridge Engineering Structural Dynamics，China Merchants Chongqing Communications Technology Research & Design Institute Co.，Ltd.，Chongqing 4Ooo67， China;

3.FujianCivilEngineering&.Architectural Society，Fuzhou 35OoOl，China;

4.College ofCivil Engineering，Fujian University of Technology，Fuzhou 35Ol18，China）

Abstract：InordertoobtainthemaininfluncingfactorsofbufetingresponsecalculationofI-shapedmain girdercable-stayed bridge，taking QingzhouMinjiang RiverBridgeastheengineeringbackground，thebufetingresponsecharacteristicsofmaingirder displacement wereanalyzedbyusingthre-dimensionalmulti-modalcouplingbufetingcalculationmethodonthebasisofwindtunneltest.Thesignificanceofninefactorsinbuffetingresponsewas testedbyuniformexperimentaldesignandregressionanalysis method.Theresultsshowthattheaerodynamicadmitance，fluctuatingwindcorrelationcoeficient，erticalwindspectrumaver agewind profileindex，surfaceroughnessheightandairdensityhavesignificant influenceonthebuffetingresponseofcablestayed bridgeinthecommonrangeofvalues.Theinfluenceofstructuralmassanddampingratioisnotsignificant，anditsvaluedeviation canbeignoredinbufetingcalculation.Thehorizontalwindspetrumonlyhasasignificant efectonthelateralbuffetingresponse.

Keywords：cablestayedbridge;bufeting;shapedmainbeam;windtunetestsuniformexperimentaldesig;egresioaalysis

Ⅱ型主梁一般采用型钢与混凝土组合断面，具有重量轻，构造简单，受力合理，制作、施工和养护方便，造价相对较低等优点，被广泛应用于斜拉桥主梁[1]，如加拿大Annacis桥、中国南浦大桥、杨浦大桥、青洲闽江大桥等。（剩余15204字）