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24120071JournalofHighwayandTransportationResearchandDevelopmentVol24No1Jan2007:10020268(2007)01004704:20060606:(200631822327)(200331822315):(1974-),,,,,(jxie@riohcn)谢峻1,2,王国亮1,郑晓华1(1,100088,2,100084):近年来,大跨径预应力混凝土箱梁桥的下挠现象日益威胁结构安全,而导致这一现象的原因仍然没有完全明确从混凝土的收缩徐变预应力效应箱梁开裂的影响现有计算与防治手段等方面,对国内外在大跨径预应力混凝土箱梁桥下挠问题上的研究现状进行了总结与综合评价分析;对导致下挠问题的主要成因与研究难点在机理上进行了解释最后,对桥梁设计计算桥梁混凝土施工及箱梁下挠的防治技术进行论述,并对开展控制结构长期下挠的研究提出了建议:大跨径;箱梁桥;预应力混凝土;长期下挠:U44821+3;U4457:AStateofArtofLongtermDeflectionforLongSpanPrestressedConcreteBoxgirderBridgeXIEJun1,2,WANGGuoliang1,ZHENGXiaohua1(1ResearchInstituteofHighway,theMinistryofCommunication,Beijing100088,China;2DepartmentofCivilEngineering,TsinghuaUniversity,Beijing100084,China)Abstract:ThelongtermdeflectionofLongSpanPrestressedConcreteBoxgirderBridge(LSPCBB)isgettingmoreandmoreseriousintermsofstructuresafetyAndtherearestillmanyambiguousreasonsastothecauseofthedeflectionofLSPCBBInrespectofthecausesoflongtermdeflection,domesticandaboardresearchliteraturesonthedeflectionproblemofLSPCBBarereviewedandanalyzedfromtheaspectsofconcretecreep&shrinkage,prestresseffect,boxgirdercracking,calculationandretrofitmethodsNotonlyarethecausemechanismandresearchdifficultiesofthedeflectionexplained,butalsothesuggestionsaboutfurtherresearchoflongtermdeflectioncontrolindesigncalculation,constructionandretrofittechnologiesofLSPCCBarepresentedKeywords:longspan;boxgirderbridge;prestressedconcrete;longtermdeflection19501,62mBalduisntein[1],,,301m,,,:(1),;(2)1,,,,,,1977KororBabeldaob,241m,,,12m,1996[6],,,,,,1[2~5]Tab1DeflectionofsometypicalLSPCBBaroundtheworldammmStolma1998330192Stvset19938220200Parrotts19781219563519977270223Grandmre1977918143001,,,,,,[2,7~11]:(1)();(2);(3);(4)(),,11,191(ASTM)1907,,,CBEFIP(MC78)(MC90)(MC99)ACI209R82ACI209R92Ba!antPanulaBPBP2Ba!antB3,,20%,35%[2],,,,[2,7],,,,,,,,,,,,,,,,,,,,[11],,,,4824c04~05fc,,,c04~05fc,,,,,,,,Ba!ant[9]PiotrGwozdziewicz[7],,,,,,,,,,,12,,,816%[12],,,,,,,,,!,,13,,:(1),,,,;(2);(3),,(4),ParrottsFerry1978,12,195m635mm,,3[3],,,,,14,,,,,,,,95%,,,,491,:,,,15,,,,[13],,,,2,,,,,,,,3,,,,,,,:(1),,,,(2),,,(3)(4),:[1]SANTIAGORODRIGUEZDesignoflongspanconcreteboxgirderbridgeschallengesandsolutions[C]∀Proceedingsofthe2004StructuresCongressBuildingonthePast:SecuringtheFutureNashvilleTNUSA:ASCE,2004:361-371[2]PETERFTAKACSDeformationsinConcreteCantileverBridges:ObservationsandTheoreticalModeling[D]Norway:TheNorwegianUniversityofScienceandTechnology,2002[3]RAFAELMANZANAREZ,MIROSLAVOLMERParrottsFerryBridgeRetrofit[R]TYLinInternational,1994[4],[J],2004,(8):287-289[5]BRUNOMASSICOTTE,ANDREPICARDMonitoringofaprestressedsegmentalboxgirderbridgeduringstrengthening[J]PCIJournal,1994,39(3):66-80[6]PILZMTheKororBabeldaobbridgeintherepublicofPalau,historyandtimedependentstressanddeflectionanalysis[D]UK:ImperialCollegeofScienceandTechnology,1997[7]PIOTRGWOZDZIEWICZ,etalLongtermserviceabilityofconcretestructureswithregardstomaterialbehaviorsandcyclicloading[C]∀Proceedingsofthe2000StructuresCongressAdvancedTechnologyinStructuralEngineeringPhiladelphiaPennsylvaniaUSA:ASCE,2000:1-8[8]MICHALTEVULA,etalSomedetailsoflongtermanalysisofconcretebridges[C]∀2ndInternationalPhDSymposiuminCivilEngineeringBudapestHungary1998:26-28[9]ZDENEKPBAZANT,JOONGKOOKIMImprovedpredictionmodelfortimedependentdeformationsofconcrete:part5cyclicloadandcyclichumidity[J]MaterialsandStructures,1992,25(147):163-169[10]IANNROBERTSONPredictionofverticaldeflectionsforalongspanprestressedconcretebridgestructure[J]EngineeringStructures,2005,27(12):1820-1827[11]VLADIMRKRSTEK,etalBoxgirderbridgedeflections[J]ACIConcreteInternational,2006,28(1):55-63[12]XIANPINGLI,IANNROBERTSONLongtermperformancepredictionsofthenorthHalawavalleyviaduct[R]USA:UHMCEE0304,UniversityofHawaii,2003[13],[J],2006,23(4),47-505024