浅析平面应力法模拟钢纤维与混凝土之间的界面粘结 英文论文修改_第1页
浅析平面应力法模拟钢纤维与混凝土之间的界面粘结 英文论文修改_第2页
浅析平面应力法模拟钢纤维与混凝土之间的界面粘结 英文论文修改_第3页
浅析平面应力法模拟钢纤维与混凝土之间的界面粘结 英文论文修改_第4页
浅析平面应力法模拟钢纤维与混凝土之间的界面粘结 英文论文修改_第5页
全文预览已结束

下载本文档

版权说明：本文档由用户提供并上传，收益归属内容提供方，若内容存在侵权，请进行举报或认领

文档简介

USINGPLANESTRESSMETHODTOSIMULATETHEINTERFACIALBONDBETWEENSTEELFIBERANDCONCRETEABSTRACTINTERFACIALBONDBETWEENSTEELFIBERANDCONCRETEIMPACTSDIRECTLYONTHEREINFORCINGANDTOUGHENINGFORTHEFIBERSTOTHECONCRETEALLALONG,MOSTINTERFACIALBONDRESULTSBETWEENTHETWOWEREBASEDONTHETESTITISDIFFICULTTOSIMULATETHEDESTRUCTIONOFTHEINTERFACEBYTHENUMERICALFINITEELEMENTMETHODDUETOTHELACKOFBONDSTRESSVERSUSSLIPRELATIONSHIPINLOCALTHISPAPERIMPROVESTHECALCULATINGMETHODONBONDSTRESSVERSUSSLIPRELATIONSHIPINLOCALOFSTRAIGHTSTEELFIBERPULLEDOUTFROMTHECONCRETE,ANDADOPTSANEWMODELINGMETHODUSINGPLANESTRESSMETHODTOSIMULATETHEPROCESSOFTHESHEARSTAIGHTSTEELFIBERPULLEDOUTFROMTHECONCRETEFINITEELEMENTRESULTSANDTESTRESULTSAREINGOODAGREEMENTSOTHECALCULATINGMETHODINTHISPAPERONBONDSTRESSVERSUSSLIPRELATIONSHIPINLOCALANDPLANESTRESSMETHODAREREASONABLEKEYWORDSSTEELFIBERREINFORCEDCONCRETESFRCINTERFACIALBONDINGPLANESTRESSFINITEELEMENT1INSTRUCTIONTHEDESTRUCTIONOFSTEELFIBERREINFORCEDCONCRETESFRCISGENERALLYSTARTWITHTHECONCRETEMATRIXCRACKINGALARGENUMBEROFMICROCRACKSINCONCRETEMATRIXCONTINUOUSEXPANSIONUNDERTHEFORCEBRIDGINGFIBERBLENDINGINCONCRETEWILLPLAYABLOCKINGROLE,WHILETHESIZEOFWHICHWILLULTIMATELYDEPENDONINTERFACEBONDINGSTRENGTHBETWEENSFANDCONCRETETHEREFORE,INTERFACEISSUEHASBECOMETHEBASISRESEARCHSUBJECTSUNREMITTINGWITHTHEDEVELOPMENTOFCOMPUTERTECHNOLOGYANDTHEMODERNCOMPUTINGMETHODS,MOREANDMOREDOMESTICANDFOREIGNRESEARCHERSUSEFEMTOSIMULATETHEPROCESSTHATSTEELFIBERPULLEDOUTFROMTHEMATRIX,THISPROCESSUSUALLYBESIMPLIFIEDAXISYMMETRICALTWODIMENSIONALMODEL2HOWEVER,THISSIMPLIFICATIONCANONLYBESIMULATEDTHEPROCESSOFSTRAIGHTFIBERSPULLEDOUTFROMTHEMATRIXWITH0DEGREEANGLERATHERTHANNON0DEGREEANDITCANNOTBESIMULATEDTHEPROCESSOFDEFORMEDFIBERSPULLEDOUTFROMTHEMATRIXWHENMODELING,WENEEDTOBONDSTRESSVERSUSSLIPRELATIONSHIPINLOCALOFINTERFACEBETWEENSFANDCONCRETEBUTDUETOTHEDISTRIBUTIONOFINTERFACESHEARSTRESSISCOMPLEXANDSTEELFIBERISSMALLERINSIZE,ITISDIFFICULTTOOBTAINEFROMTHEEXPERIMENTDIRECTLY2,ANDTHEFORMULAWITCHUSEDTOCALCULATEISFEWATTHEPRESENTTIME,THECONSTITUTIVERELATIONOBTAINEDMAINLYBYTHEFOWLINGMETHODSTHATITERATIVECOMPUTATIONANDPILOTCALCULATIONFORTHEFORMERWEMUSTWORKOUTCOMPUTERITERATIVEPROGRAMANDFORTHELATTERITMAYTAKETIMEANDHARDWORKSOTHISPAPERIMPROVESTHECOMPUTATIONMETHODOFTHEBONDSTRESSVERSUSSLIPRELATIONSHIPFORSFPULLEDOUTFROMTHECONCRETE,WHICHISSUITABLEFORFINITEELEMENTMETHODATTHESAMETIME,ANEWMODELLINGMETHODISADOPTEDA1USINGPLANESTRESSMETHODTOSIMULATETHEPROCESSOFTHESHEARSTAIGHTSFPULLOUTEDOUTFROMTHECONCRETE2TEXT21BONDSTRESSVERSUSSLIPRELATIONSHIPBONDSTRESSVERSUSSLIPRELATIONSHIPCANBEAPPROXIMATECALCULATEDBYLOADDISPLACEMENTCURVEINTESTFORTHESTEELFIBERPULLEDOUTFROMTHECONCRETEACCORDINGTOTHELOADDISPLACEMENTCURVEWITHANEVIDENTTRANSITIONBEFORETHEPEAKLOADORNOT,BONDSTRESSVERSUSSLIPRELATIONSHIPCANBESIMPLIFIEDFOURLINEARMODELFIGORTRILINEARMODELFIGCALCULATIONASSUMPTIONS1SUPPOSETHATSHEARSTRESSONINTERFACEISINUNIFORMDISTRIBUTION,THATISAVERAGEBONDSTRENGTHASBONDSTRENGTH2SUPPOSETHATSHEARSTRESSONSFISINEQUIVALENTDISTRIBUTIONTHEVALUEOFCANBETAKENTHEFOLLOWINGFORMULATOAPPROXIMATECALCULATE1F1/UFLFMAXFMAX/UFLF2F2/UFLF3F3/UFLFFFLUF11A2FFLUFMAXMAXA2FFLUF22A2FFLUF33WHEREUFISCIRCUMFERENCEOFSFCROSSSECTIONMM,LFISEMBEDMENTLENGTHOFSFSMM,ANDF1A3FMAXA3F2A3F3ARETHECORRESPONDINGPULLOUTLOADOFTHELOADA0DISPLACEMENTCUVENIFTHEREAREMORETHANONESTEELFIBERSPULLEDOUT,TAKETHEAVERAGEWHEREFMAXISTHEPEAKLOAD,F1ISTHELOADOFTHEEVIDENTTRANSITIONBEFOREFMAX,F2ISTHELOADOFTHEEVIDENTTRANSITIONAFTERFMAXANDF3ISTHELOADOFTHECUVESENDA41A5AA6A42A5AA6FORTHETWOMODELSABOVEISIMPORTANTTODEFINE1U,WHICHCANBESEENASSLIPPAGEPERUNITLENGTHWEMUSTCONDERITASFOLLOWA7STEELFIBERANDCONCRETEDEFORMTOGETHERWHENTHEPULLOUTLOADISSMALLERA8WITHTHEINCREASINGOFTHEPULLOUTLOAD,THESTEELFIBERANDTHECONCRETEDEBONDINLOCALTHESLIPPAGEBETWEENTHEMOFTHEDEBONDINGSEGMENTISTHEDEFORMATIONDIFFERENCEOFTHETWO,THATISLSCAFACF,WHEREFAISMEANTENSILESTRAINOFSTEELFIBERINLLENGTH,CAISMEANSHEARSTRAINOFCONCRETEINLLENGTHANDLISTHELENGTHOFTHEDEBONDINGSEGMENTA9INPERUNITLENGTH,THEDEFORMATIONDIFFERENCEOFTHEDEBONDINGSEGMENTBETWEENSTEELFIBERANDCONCRETECANBESIMPLIFIEDAPPROXIMATELYASCAFASA10A11SPRINGELEMENTSWHICHARESIMULATEDTHEINTERFACEMUSTBEADDEDONTHECOINCIDENCENODESOFSTEELFIBERELEMENTSANDCONCRETEELEMENTSINTHEORY,STEELFIBERANDCONCRETEDEFORMTOGETHERBEFOREDEBONDINGWHICHEQUIVALENTOFSPRINGNOTSTRETCH,BUTTHESPRINGELEMENTSUSEDARENOTALLOWEDTOTHISSUITATIONTHATTHEFORCEINCRASESANDTHEDEFORMATIONDOESTINCRASESO,1UCANBEWRITTENINTHEFOLLOWINGMANNERXFFSU1,WHEREXFFISTHETENSILESTRAINOFSTEELFIBERWITHPULLOUTLOADXFFORQUADRILATERALFORMMODELXFTAKE1FANDTRILINEARMODELTAKEMAXF2UA123UINMODELANDMAXFUINFOURLINEARMODELTAKETHEMEANVAULEINPERLENGTHCORRESPONDINGTHESLIPPAGEOF2FA123FA12MAXFATTHEPULLOUTLOADDISPLACEMENTCURVE22MATERIALPROPERTIESTAKINGINTOACCOUNTTHESHEARSTRAIGHTSTEELFIBERMAYINLARGEDEFORMATIONORPULLEDOFFWHENPULLEDOUTSOTHEMATERIALPROPERTYOFITADOPTINGPERFECTELASTICPLASTICANDHARDENINGMODELFIG2A132ACTUALLYCONCRETECONSTITUTIVEMODELSHAVEDECLINEDSECTIONWHICHCANLEADTOUNCONVERGENCEWHENUSEDTOCALCULATESOMETIMESA14WESHOULDAVOIDTHEDECLINE3INTHISPAPER,THEMODELOFCONCRETECONSTITUTIVEPROPOSEDBYRA15SCHISADOPTEDCUBECRUSHINGSTRENGTHOFCONCRETEOBTAINEDINTESTCOMEFROM4THEYARETHEMATRIX12859MPATHEMATRIX24104MPATENSILESTRENGTHISCACULATEDBY32260CUTFF23UINGPLANESTRESSMETHODTOSIMULATETHEPROCESSOFTHESHEARSTAIGHTSFPULLOUTEDOUTALONGTHEAXISFROMTHECONCRETE231THEFINITEELEMENTMODELELEMENTPLANE82ISADOPTEDTOSIMULATESTEELFIBERANDCONCRETEANDELEMENTCOMBIN39WHICHISNONLINEARSPRINGTOSIMULATETHEINTERFACEOFTHETWOSPRINGSAREADDEDONTHEINTERMEDIATECOINCIDENCENODESOFSTEELFIBERELEMENTANDCONCRETEELEMENTINTERFACIALBONDINGSTRENGTHISCONSIDEREDONLYALONGTHEFIBERAXISASTHEPULLEDOUTMODELINTESTHASSYMMETRY,THEREFORE,THEPULLEDOUTPROCESSOFONLYONESTEELFIBERISSIMULATEDBYPLANESTRESSMETHODTHEDIMENSIONSOFTHEFIBERSCROSSSECTIONINFINITEELEMENTMODELCANBECONVERTEDBYEQ221LLSF2WHEREFSISTHEORIGINALCROSSSECTIONALAREAOFFIBER,1LISTHEWIDTHOFTHEFIBERSCROSSSECTIONINMODELAND2LISTHEHEIGHTEQ3ALSONEEDEDTOSATISFIED,FUL223WHEREFUISCIRCUMFERENCEOFTHESTEELFIBERTHEFINITEELEMENTMODELESTABLISHEDASSHOWNFIG3A163232SELECTIONOFTHEMODELPARAMETERSINTHISPAPER,1L054MM,2L16956MMANDFL1674MM,WHEREFLISTHEEMBEDDEDLENGTHSINONECONCRETEBLOCKTHESIZEOFTHECONCRETEBLOCKIS5076MM2214MM16956MMBECAUSETHEMODELISINPLANE,SO16956WHICHISNOTDIRECTLYINVOLVEDINTHEGEOMETRICMODELLINGISUSEDASREALCONSTANTSOFTHICKNESSFOURLINEARMODELISUSEDASBONDSTRESSVERSUSSLIPRELATIONSHIPA17A18A19A20A21A22INTHISPAPERANDUVALUECALCULATEDBYTHEABOVEMETHODASSHOWNINTABLE1A231UA24A25A23TABLE1TABLEOFUVALULATIONTYPEPARAMETER1U/MM1/MPAMAXFU/MMMAXF/MPA2U/MM2/MPA3U/MM3/MPAJ1J20000809000084225662830125009002730323030002180070115755700600003710437J1A26SHEARSTAIGHTSTEELFIBERPULLEDOUTFROMTHETHEMATRIX1J2A26SHEARSTAIGHTSTEELFIBERPULLEDOUTFROMTHETHEMATRIX2THEFORCESOFSPRINGELEMENTALONGTHEFIBERSAXISCANBEWRITTENINTHEFOLLOWINGMANNER2LLFEE4WHEREELISTHEMESHINGLENGTHOFTHEELEMENTS,TAKING054MMASTHEVALUEOFTHEBONDSTRENGTHISSMALLERANDSHORTERBETWEENTHEFIBERENDSANDTHEMATRIX,TAKING079MPASUPPOSINGTHESTIFFNESSOFTHESPRING0K260N/MM,SOTHEFORCESOFTHESPRINGELEMENTSARESHOWNASPI2FRF0542079PI0723N,WHERERFISTHEEQUIVALENTRADIUSOFTHEFIBERTHUSTHEELONGATIONOFTHESPRINGSISSHOWNAS0KF0003MMANDAFTERTHENITBECOMES0233THENUMERICALRESULTSCOMPAREDWITHTHEEXPERIMENTALRESULTSFIG4PRESENTSTHATANEXCELLENTCONCORDANCEHASBEENOBTAINEDBETWEENTHETWOCURVESOFTHEEXPERIMENTALRESULTSANDTHENUMERICALRESULTS,BUTTHECHANGEINDISPLAMENTOFTHENUMERICALCURVESARENOTVERYCLEARBEFOREDEBONDINGCOMPLETELYTHECURVESOFSMALLDISPLACEMENTFORJ1A27J2AREILLUSTRATEDINFIG5A28A29A28A30A28A31A28A32A28A33A28A28A33A29A28A33A30A28A33A31A28A33A32A28A29A28A28A28A34A31A35A33A29A36A37A38A39A40A41A42A43A44A43A45A46A47A44A44A48PULLOUTLOADNEXPERIMENTALRESULTOFJ1NUMERICALRESULTOFJ1EXPERIMENTALRESULTOFJ2NUMERICALRESULTOFJ2A49A50A49A51A49A52A49A53A49A54A49A49A54A50A49A54A51A49A54A52A49A54A53A49A50A49A49A49A49A55A49A49A56A49A55A49A54A49A55A49A54A56A49A55A49A50A57A58A59A60A61A62A63A64A65A64A66A67A68A65A65A69A70A71A72A72A73A71A74A72A73A75A76A77A78A79A80A81A82A83A84A80A81A82A83A85A864A865ASCANBESEENFROMFIG5THELOADDISPLACEMENTCURVESBEFOREDEBONDINGCOMPLETELYAREDIVIDEDINTOTWOSTAGES,THATISELASTICSTAGEANDLOCALDEBONDINGSTAGEATTHEFORMERSTAGE,THELOADANDTHEDISPLACEMENTAREALMOSTBYLINEARGROWTHWHENTHETWOCURVESREACHTHESTAGEOFDEBONDINGCOMPLETELY,THELOADSCOMPLYWITHTHELAWTHATINCREASEATFIRST,THENDECREASEWITHANARROWRANGEANDTHENINCREASEAGAINTHISISENTIRELYCONSISTENTWITHTHECONDITIONSFROMTHESTAGEOFDEBONDINGCOMPLETELYTOOFTHEPEAKLOADTHENUMERICALRESULTSCOMPAREDWITHTHEEXPERIMENTALRESULTSOFTHEINTERFACIALBONDOFSFRCSHOWNINTABLE2TABLE2BONDSHEARSTRENGTHOFNUMBERIALRESULTSANDEXPER
人人文库> 全部分类> 毕业设计 > 毕业论文

温馨提示

  • 1. 本站所有资源如无特殊说明，都需要本地电脑安装OFFICE2007和PDF阅读器。图纸软件为CAD,CAXA,PROE,UG,SolidWorks等.压缩文件请下载最新的WinRAR软件解压。
  • 2. 本站的文档不包含任何第三方提供的附件图纸等，如果需要附件，请联系上传者。文件的所有权益归上传用户所有。
  • 3. 本站RAR压缩包中若带图纸，网页内容里面会有图纸预览，若没有图纸预览就没有图纸。
  • 4. 未经权益所有人同意不得将文件中的内容挪作商业或盈利用途。
  • 5. 人人文库网仅提供信息存储空间，仅对用户上传内容的表现方式做保护处理，对用户上传分享的文档内容本身不做任何修改或编辑，并不能对任何下载内容负责。
  • 6. 下载文件中如有侵权或不适当内容，请与我们联系，我们立即纠正。
  • 7. 本站不保证下载资源的准确性、安全性和完整性, 同时也不承担用户因使用这些下载资源对自己和他人造成任何形式的伤害或损失。

最新文档

评论

0/150

提交评论