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大跨径劲性骨架钢筋砼拱桥徐变收缩时效分析.docx

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大跨径劲性骨架钢筋砼拱桥徐变收缩时效分析 Abstract Asthemainload-bearingstructureoflarge-spanbridges,theprestressedconcretearchbridgehasbecomethefocusofresearchinthebridgeengineeringfield.However,duetothevariationofthemechanicalpropertiesofthematerialovertime,thedeformationofthestructurewillchange,leadingtoproblemssuchascrackingandevencollapseofthebridge.Basedonthissituation,thispaperanalyzesthecreep,shrinkageandtimeeffectoftheprestressedconcretearchbridge,andproposescorrespondingmeasurestoimproveitsmechanicalproperties. Keywords:prestressedconcretearchbridge,creep,shrinkage,timeeffect 1.Introduction Asakindofimportanttransportationinfrastructure,bridgesplayanirreplaceableroleinpeople'slives.Withthecontinuousdevelopmentofeconomyandsociety,thespanofthebridgeisgettinglargerandlarger,andtheconstructiontechnologyisalsoconstantlyimproving.Inthisprocess,theprestressedconcretearchbridgehasgraduallybecomethepreferredbridgestructurebecauseofitsadvantagessuchashighmechanicalstrength,gooddurability,andlargespan. However,intheprocessofusingtheprestressedconcretearchbridge,thedeformationofthestructurewillchangeduetofactorssuchascreep,shrinkageandtimeeffect.Therefore,itisnecessarytoconductin-depthresearchonthesefactorstoensurethesafetyandservicelifeofthebridge. 2.Creepanalysis Creepisakindoftime-dependentdeformationofconcrete,whichiscausedbythecontinuousapplicationofstress.Thisdeformationcancontinueforalongtime,anditwillnotrecoverafterthestressisremoved.Thecreepbehaviorofconcretewilldirectlyaffectthestructuraldeformationoftheprestressedconcretearchbridge. Throughtheanalysisofthecreeptestofconcrete,itcanbefoundthatthecreepdeformationofconcreteunderthesamestressconditionisrelatedtotheratioofthestresstotheconcretestrength,theageoftheconcrete,theenvironmentaltemperatureandhumidity,etc.Inpracticalengineering,itisdifficulttocontrolthesefactorscompletely,whichwillaffectthecreepofconcrete. Therefore,inthedesignoftheprestressedconcretearchbridge,thecreepofconcreteshouldbefullyconsidered,andthecreepcoefficient