Page 163 - 《水资源与水工程学报》2023年第1期
P. 163
!34 " ! 1 # & ' ( ) & * + , - Vol.34No.1
2023 $ 2 % JournalofWaterResources&WaterEngineering Feb.,2023
DOI:10.11705/j.issn.1672-643X.2023.01.19
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FGHIJ:TV33 KLMNO:A KPQJ:1672643X(2023)01015909
Structuralperformanceanalysisofreinforcedconcretecrane
beam withirregularcrossscalecracks
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JIAChao ,WANGYixin,MINQiaoling,LIMingchao
(1.StateKeyLaboratoryofHydraulicEngineeringSimulationandSafety,TianjinUniversity,Tianjin300350,China;
2.YellowRiverEngineeringConsultingCo.,Ltd.,Zhengzhou450003,China)
Abstract:Asanecessarystructurefortheconstructionofhydropowerstations,thecranebeamofrein
forcedconcretepowerhouseiswidelyusedinthedamengineering.However ,theenvironmentalcondi
tionsoflowtemperature,highwindspeedandlowhumidityinthealpineregionseasilyleadtoirregular
surfacecracksinthereinforcedconcretecranebeamduringconstruction ,whichseriouslyaffectsthesafe
serviceoftheconcretestructure.Thescaleofirregularcracksismuchsmallerthanthestructuralscaleof
reinforcedconcretecranebeams ,whichmakesitdifficultfortheexistingcalculationmethodstoeffective
lyconsidertheirregularityandmorphologicalauthenticityofthecracks.Tosolvethisproblem,ahighly
detailedsimulationmethodforirregularcrossscalecracksbasedonrealcrackpointcloudisproposed.In
thismethod ,thecracksurfaceisrepresentedbypointcloudsandembeddedtothefiniteelementmesheof
thestructure.Theelementnodeswherethecrackpassesthrougharethenprojectedtothecracksurface
inbatchestocapturethecrackanditspropagationpath.Themainadvantageoftheproposedmethodis
thatitdoesnotneedtochangetheinitialelementtypesandmeshthegeometricmodelwithcracks ,which
canreducethedifficultyofmeshingforcomplex3Dmodelsandismoreapplicablethanconventionalgeo
metricsubdivisionmethod.Moreover ,theconcretethreepointbendingbeamandwedgesplittingexperi
mentsareconductedtoverifythisproposedmethod.Thenthismethodisappliedtothestructuralsafetya
nalysisofareinforcedconcretecranebeaminthealpineregionofChina,whichcanprovideatechnical
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