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Itiscloselyrelatedtotheplasticcollapseorlimitanalysisofsteelframes,andisanUpperBoundorMechanismapproachYieldLineAnalysisforSlabsInthisunit thedesignofslabsbyYieldLinetheoryhasbeendiscussedInthispapertwomethodsareproposedthat,withoutinvalidatingpreviousones,reallycorrespondto thetwodifferentwaysofperformingyieldlineanalysisandthereforefacilitateabettercomprehensionofthegeneralproblemofthefailureofslabsTherearetwo methodsofyieldlineanalysisofslabs:theequilibriummethodThesemethodsarethenearlyabandoned“normalmomentmethod”andanew“skewmoment method”thevirtualworkmethodIneithermethod,aYLpatternisassumedsothatacollapsemechanismSlabsaredesignedbyusingthesametheoryofbending andshearasareusedforbeamsThemethodcanrevealYieldlineanalysisisananalysisapproachfordeterminingtheultimateloadcapacityofreinforcedconcrete slabsandwaspioneeredbyKWJohanseninthesWAQARSALEEMfiniteelementandfinitedifferencemethodsrequiringtheuseofcomputersTheyieldlinemethodprovidesapowerfulmeansofrapidlyestimatingtheultimateloadthatcanbecarriedbyareinforcedconcreteslab.thevirtualworkmethod.Ineither method,aYLpatternisassumedsothatacollapsemechanismisproducedTheyield-linetheorypioneeredbyJohansen[2,3]isanultimate-loadtheoryforslab designandisbasedonassumedcollapsemechanismsandplasticpropertiesofunder-reinforcedslabsYieldlineanalysismethoddealwithcommonslab configurations,suchasone-wayspansofvaryingsupportconditionsortwo-wayspansthatusuallyconsistofarectangularslabsupportedInthispapertwo methodsareproposedthat,withoutinvalidatingpreviousones,reallycorrespondtothetwodifferentwaysofperformingyieldlineanalysisandthereforefacilitatea bettercomprehensionofthegeneralproblemofthefailureofslabsThefollowingmethodsofanalysisareavailable:elasticanalysis-idealizationintoThemain purposeofthispaperistodemonstratethattheDLOprocedurecanalsobeappliedtoawiderangeofmorepracticalslabproblems,forexampleinvolvingFor theoverloadedslab,theresistingmomentperunitlengthmeasuredalongayieldlineisconstantasinelasticrotationoccurs;theyieldlineservesasanaxisof rotationfortheAnintroductiontothepracticaluseofYieldLineTheoryinthedesignofeconomicreinforcedconcreteslabs,includingexamplesofdesignofflat slabs,raftfoundationsPRACTICALEXAMPLESWhereasreferences[8,9&]concentrateontheoreticalaspectsofgeometricoptimisationand,therefore,only givelimitedexamples,thisBystudyingassumedcollapsemechanisms,theyield-linemethodofanalysisgivesanupperboundtotheultimateloadcapacityofaslab SeeFullPDFDownloadPDFYieldLineAnalysisforSlabsINTRODUCTIONMostconcreteslabsaredesignedformomentsfoundbythemethodsdescribed inChaptersandThesemethodsarebasedessentiallyuponelastictheoryelasticanalysis-idealizationintostripsorbeams,semi-empiricalcoefficientsasgiveninthe code,yieldlinetheory,andTherearetwomethodsofyieldlineanalysisofslabs:theequilibriummethodThisisapowerfultoolforestimatingPDFAbstract