不同纤维约束高强混凝土圆柱轴压性能与本构关系的研究

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1、万方数据广东工业大学硕士学位论文璃纤维约束高强混凝土及大断裂应变纤维(PEN和PET)约束高强混凝土。(4)利用所提出考虑尺寸效应的玻璃纤维约束高强混凝土本构模型和大断裂应变纤维(PEN和PET)约束高强混凝土的本构模型进行变参数研究。研究发现，在约束应力相同的情况下，玻璃纤维管约束混凝土圆柱的极限应力和极限应变随着试件尺寸的增大而减小，减小幅度不呈线性关系。在其它参数不变的情况下，大断裂应变纤维管(PEN和PET)约束混凝土圆柱的极限应力和极限应变随着壁厚的增大而增大，同时变化趋势不呈线性关系；在其它参数不变的情况下，大断裂应变纤维(PEN和

2、PET)管约束混凝土圆柱的极限应力随着约束混凝土强度的提高而提高，而极限应变则随着混凝土强度的提高而减小，且变化趋势都不呈线性关系。关键词：轴压性能；尺寸效应；本构关系：玻璃纤维管及大断裂应变纤维管约束高强混凝土：l王万方数据ABSTRACTFiberreinforcedpolymer(FRP)iswidelyusedinvariousstructurereinforcement，comparedwiththetraditionalmethod，whichhasobviousadvantages，suchashighstrength，light

3、quality，gooddurabilityandeasyconstruction．Atpresent,theresearchmainlyconcentratedonthemechanicalpropertiesofCFRPconfinednormalconcrete，andtheglassfiberreinforcedpolymer(GFRP)tubesandthelargerupturestrainfiberreinforcedpolymer(LRSFRP)tubesconfinedhigh·strengthconcreteisless．B

4、asedontheaboveanalysis，inthispaper，theaxialcompressionbehaviorandconstitutiverelationshipsofhigh-strengthconcretecylindersconfinedbyGFRPtubesandLRSFRPtubeshascarriedontheexperimentalstudy，thespecificresearchcontentsandconclusionsareasfollows：(1)ThetypesofFRP，specimens’size，t

5、hickness，asstudyparameters，22GFRPconfinedhigh-strengthconcretecylindersand2LRSFRPconfinedhighstrengthconcretecylindersarecarriedontheaxialcompressiontest，whichanalyzestheinfluenceofthevariousparametersonthedamageform，ultimatebearingcapacity，andothermechanicalproperties．Study

6、hasshowedthatwiththethicknessincrease，theultimatestressandtheultimatestrainofhigh-strengthconcretecylindersconfinedbyGFRPtubesareincreasedaccordingly．AndtheGFRPconfinedhigh-strengthconcretecylindersexistsizeeffect．Thestrainofhigh-strengthconcretecylindersconfinedbyLRSFRPtube

7、saregreaterthanGFRP，CFRPandAFRP．Thehigh-strengthconcretecylindersconfinedbyPETtubesweredestroyeduptothe9．17％ofaxialstrainundertheeffectofaxialstress，whichismoresuitableinseismicstrengthening．(2)Baseontheexperiment，theapplicabilityconstitutiverelationshipsfortheGFRPandLRSFRPc

8、onfinedhigh-strengthconcretecylinderswereresearched．Theexistconfinementmode