外文翻译时间变化的钢筋混凝土阻力分析(英文).pdf外文翻译时间变化的钢筋混凝土阻力分析(英文).pdf

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VOL17NO4JOURNALOFWUHANUNIVERSITYOFTECHNOLOGYMATERSCIEDDEC2002RANDOMTIMEDEPENDENTRESISTANCEANALYSISONREINFORCEDCONCRETESTRUCTURES3GUANCHANG2SHENG1WULING21WUHANUNIVERSITYOFTECHNOLOGY2WUHANUNIVERSITYOFSCIENCEANDTECHNOLOGYRECEIVEDAUG20,2001ABSTRACTTHEANALYSISMETHODONRANDOMTIMEDEPENDENCEOFREINFORCEDCONCRETEMATERIALISINTRODUCED,THEEFFECTMECHANISMONREINFORCEDCONCRETEAREDISCUSSED,ANDTHERANDOMTIMEDEPENDENCERESISTANCEOFREINFORCEDCONCRETEISSTUDIEDFURTHERMORE,THECORROSIONOFSTEELBARINREINFORCEDCONCRETESTRUCTURESISANALYZEDAPRACTICALSTATISTICALMETHODOFEVALUATINGTHERANDOMTIMEDEPENDENTRESISTANCE,WHICHINCLUDESMATERIAL,STRUCTURALSIZEANDCALCULATIONINFLUENCE,ISALSOESTABLISHEDINADDITION,ANEXAMPLEOFPREDICTINGRANDOMTIMEDEPENDENTRESISTANCEOFREINFORCEDCONCRETESTRUCTURALELEMENTISGIVENKEYWORDSRANDOMANALYSIS;TIMEDEPENDENTRESISTANCE;REINFORCEDCONCRETEGUANCHANG2SHENG管昌生BORNIN1957;PROF;INSTITUTEOFARCHITECTUREANDCIVILENGINEERING,WUHANUNIVERSITYOFTECHNOL2OGY,WUHAN430070,CHINA3FUNDEDBYHUBEIPROVINCECONSTRUCTIONBUREAUG2002191INTRODUCTIONREINFORCEDCONCRETEISONEOFTHEMOSTUSEFULMATERI2ALSINCIVILENGINEERINGFORITSSUITABILITYANDINEXPENSIVEPRICETHEREFORE,ALARGENUMBEROFTHISKINDMATERIALISUSEDHOWEVER,INTRADITIONALDESIGNOFCONSTRUCTIONSTRUCTUREANDMATERIALRESEARCHOFREINFORCEDCONCRETE,LITTEATTENTIONTOTHETIMEDEPENDENTSTRENGTHOFREINFORCEDCONCRETEISPAID,ESPECIALLYTHERANDOMPROPERTIESOFTHEVARIOUSEFFECTSONTHEMATERIALSAREHARDLYSTUDIED\1,2\UNTILRECENTYEARTHEREAREAFEWRESEARCHESTHATMENTIONTHEPROBLEMABOUTTHERANDOMTIMEDEPENDENCEOFREIN2FORCEDCONCRETEINENGINEERINGSTRUCTURESLIANDMELCH2ERS\3\HAVESTUDIEDTHEFAILUREPROBABILITYOFREINFORCEDCONCRETECOLUMNSUNDERSTOCHASTICLOADS,ANDGIVENATECH2NIQUETOCALCULATETHETIME2VARIANTFAILUREPROBABILITYLIANDLIU\4\HAVESTUDIEDTHEDURABILITYOFCONCRETESTRUCTURECONSIDERINGTHEEFFECTOFREINFORCEDCORROSIONLENG\5\ETALHAVEDISCUSSEDTHESTATUSANDPROBLEMOFSTUDYONTHESTRESSCORROSIONOFCONCRETEALSOLU\6\ETALHAVEDIS2CUSSEDTHESTATEOFREINFORCEMENTCORROSIONGENERALLYSPEAKING,REINFORCEDCONCRETERESISTANCEOBVIOUSLYDE2CREASE,WHICHDEPENDSONDIFFERENTFACTORS\7\TOEVALUATETHESAFETYOFCONCRETESTRUCTURE,ABASICTHEORYFORANALYZ2INGDURABILITYOFREINFORCEDCONCRETESHOULDBEPROPOSEDITISNECESSORYTOSTUDYRANDOMTIMEDEPENDENTPROPERTIESOFREINFORCEDCONCRETESTRUCTURES2TIMEDEPENDENTEFFECTMECHANISMSOFREINFORCEDCONCRETETHEREAREMANYFACTORSAFFECTINGTHERESISTANCEOFRE2INFORCEDCONCRETEMORETHAN50KINDSOFCHEMICALCORRO2SIONFACTORSEXISTONLYINTHEAREAOFWATERBASIN,WATERWORKSANDWATERCONDITIONINGTHEPRACTICALMETHODTOOB2TAINATIMEDEPENDENTMODELOFREINFORCEDCONCRETEISAMULTI2FACTORCOMPREHENSIONTECHNIQUEINGENERAL,FORSIN2GLE2FACTOR,MANYRESULTSHAVEBEENSHOWNTHATIFONLYCON2CRETECARBONIZATIONISCONSIDERED,AFORMULAOFPREDICTINGCARBONIZATIONTHICKCANBEWRITTENASDTKT1WHEREDT,KANDTARETHICK,SPEEDCOEFFICIENTANDTIMEOFCARBONIZATION,RESPECTIVELYUPTONOWMANYPREDICTINGMODELSAREUSEDINSTEELCORROSION,FATIGUEDAMAGE,ANDCHEMICALEROSION,BUTNOCOMMONRECOGNIZEDRESULTSUNANIMOUSLYEXISTGENERALLYSPEAKING,THEDECREASINGRESISTANCEFUNCTIONOFREINFORCEDCONCRETEINCLUDESSOMEVARIABLESTHATCANEXPRESSASSTEELBAR,CONCRETE,GEOMETRICSIZE,ENVIRONMENTCONDITIONNEAR2BY,ANDPROPERTIESOFRANDOMANDTIMEDEPENDENCEOFRE2SISTANCE\1,5\OBVIOUSLY,REINFORCEDCONCRETERESISTANCEISAFUNCTIONOFRANDOMPROCESSORVARIABLEOFSERIESOFMATE2RIALSANDSTRUCTURESREINFORCEDCONCRETECARBONIZATIONINAIRISCALLEDNEUTRALIZATION,WHICHISACOMPLEXANDSLOWNEUTRALIZATIONPROCESSOFCO2INTHEAIRANDALKALINEMATE2RIALINREINFORCEDCONCRETEINAIRITWILLTAKESEVERALDECADESTOCOMPLETELYCARBONIZETHEPROTECTIVECOATINGOFSTEELBARINDENSECONCRETE,BUTONLYTAKEAFEWYEARSINNON2DENSECONCRETEIFFINENESSOFCARBONIZEDMATERIALSISHIGHER,ITSSTRENGTHISLOWERANDCARBONIZATIONPROCESSISFASTERINDECREASINGCROSSSECTIONOFSTRUCTURECARBONIZA2TIONMAKESALKALINITYLOWERANDSTEELBARCORROSION\2\STEELBARCORROSIONISAPROCESSTHATIRONINSTEELBARSUR2FACELOSSESELECTRONCONTINUALLYANDDISSOLVESINWATERUN2DERTHECONDITIONOFOXYGENANDWATERINTERACTIONTHERE2FORE,THEVOLUMEOFERODEDMATERIALSISEXPENDEDSEVERALTIMES,WHICHCANMAKETHEPROTECTIVECOATINGOFREINFORCEDCONCRETECRACK,DROP,ANDCOHESIONDAMAGEBETWEENSTEELBARANDCONCRETEALONGSTEELBARDIRECTIONSOTHATREIN2FORCEDCONCRETESTRUCTURELOSSESBEARINGCAPABILITYRECENTRESEARCHESSHOWTHATTHESTEELBARGETSINTOASERIOUSCOR2ROSIONSTATEWHENNON2CARBONIZEDPROTECTIVECOATINGISONLY15MMTHICKONTHEOTHERHAND,THESTARTTIMEOFCORRO2SIONMAYBEINADVANCEDUETOINCOMPLETECOATINGANDCRACKINCONCRETE,ALSOCORROSIONVELOCITYMAYINCREASEGREATLYWHENSTEELSTRESSISLESSTHANYIELDINGPOINT,THECORROSIONVELOCITYISSTABLE,BUTINCREASESSEVERALTIMESIFTHECORROSIONVELOCITYPASSESOVERTHEYIELDINGPOINTTHELATTERISCALLEDSTRESSCORROSION,WHICHISOFBRITTLENESSANDMOREDANGEROUSSTEELCORROSIONCANMAKEBEARINGAREAOFSTEELBARDECREASE,COHESIONDAMAGE,ANDLOSESTRUCTUREEFFECTIVENESSEROSIONAIRANDLIQUIDALLHAVESTRONGEFFECTONREINFORCEDCONCRETE,WHICHCANMAKEREINFORCEDCON2CRETEEROSION,DECREASEPROTECTIVECOATINGOFCONCRETE,ANDFINALLYACCELERATESTEELCORROSIONWHENBEARINGDYNAMICLOAD,REINFORCEDCONCRETESTRUCTURECANUNDERGOFATIGUEDAMAGE,LEADINGSTRENGTHANDRIGIDITYTODECREASING,FORM2INGCRACKANDEXPANSIONUSUALLYFATIGUEDAMAGECANBEDIVIDEDINTODETERMINEANDRANDOMMODELS,THEFO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