基于ANSYS的混凝土抗裂試驗機理及改進研究.pdf

1、重慶交通大學碩士學位論文基于ANSYS的混凝土抗裂試驗機理及改進研究姓名：張寅申請學位級別：碩士專業(yè)：水利水電工程指導教師：鄭丹20120610ABSTRACTMassconcretestructuresplayallimportantroleinengineeringconstructionAlong謝tllthedevelopmentoflargeconcretestructuresinmodemengineering，surfac

2、ecracksofearlyconcretehavebecometheresearchfocusoftheengineersResearchshowsthatmanyfactorswouldleadtoearlycrackingoftheconcrete，andtheshrinkagedeformationisoneofthemTosolvetheproblemofearlycracksofconcrete，thephysicalmec

3、hanismofconcreteearlyshrinkagecrackingmustbeunderstoodItisalsoveryimportanttotakinganticracktestwhichcanreflectrealworkingconditionsofconcretetodetermineitsanti—crackpropertyRingtestisthemostmatureconcreteanticracktestme

4、thodItCallinvolvetheinfluenceoftheconcreteshrinkage，creep，elasticmodulus，andotherfactorsButthepresentringtestmethodhassomeshortcomingssuchaslongtestingtime，poorsensitivityTherefore，analyzingthemechanismofconcretecracking

5、intheringcracktestandstudyingtheinfluencevariousparametersonthecrackingtimeinordertoimprovethetestmodea陀verynecessarytoreduceconcretecrackandincreasethedurabilityofconcretestructuresThispaperfocusonthefollowingworks：(1)I

6、nordertostudytheconcretespecimensofearlyshrinkagecrackingperformance，observationofthespecimenofearlycrackingtime，usingtheringconstrainedtestdeviceInthispaperthe韶lnlewatercementratioofconcreteandcementmortarspecimensarete

7、stedbytheearlyringcracktestrespectivelyThroughtheobservationonthesurfaceofthecircumferentialstrainchangestomeasuretheconcreteandmortarspecimenrestrainedshrinkageperformanceThispaperdetailstheprocessoftheringcracktestandt

8、hetestresultswereanalyzed；(2)Throughthereadingofliterature，tograsptheconcreteshrinkageanddeformationtheory，analysisofthefactorsthataffecttheshrinkageofconcreteatearlyageBasedonthediffusionlawandthelawofconservationofmass

9、，determinethemathematicalmodeloftheconcreteinternalhumidityfieldcalculated，andthemodelparametersandinitialandboundaryconditionsarediscussed；Finally，analyzedtheshrinkagedeformationofconcretegeneratedundertheconstraints；(3

10、)ThefiniteelementsoftwareANSYSissimplyintroducedinthispaperUsingANSYSsoftware，theringcrackingtestmodelwassimulationcalculated，thehumidityandstressfieldcalculationswereanalyzedInordertoverifythefiniteelementsoftwareANSYSs