ACI 550.1R-01 Emulating Cast-in-Place Detailing in

ACI550.1R-01becameeffectiveSeptember14,2001.Copyright©2001,AmericanConcreteInstitute.Allrightsreservedincludingrightsofreproductionanduseinanyformorbyanymeans,includingthemakingofcopiesbyanyphotoprocess,orbyelectronicormechanicaldevice,printed,written,ororal,orrecordingforsoundorvisualreproduc-tionorforuseinanyknowledgeorretrievalsystemordevice,unlesspermissioninwritingisobtainedfromthecopyrightproprietors.ACICommitteeReports,Guides,StandardPractices,andCommentariesareintendedforguidanceinplanning,designing,executing,andinspectingconstruction.Thisdocumentisintendedfortheuseofindividualswhoarecompetenttoevaluatethesignificanceandlimitationsofitscontentandrecommendationsandwhowillacceptre-sponsibilityfortheapplicationofthematerialitcontains.TheAmericanConcreteInstitutedisclaimsanyandallre-sponsibilityforthestatedprinciples.TheInstituteshallnotbeliableforanylossordamagearisingtherefrom.Referencetothisdocumentshallnotbemadeincon-tractdocuments.Ifitemsfoundinthisdocumentarede-siredbytheArchitect/Engineertobeapartofthecontractdocuments,theyshallberestatedinmandatorylanguageforincorporationbytheArchitect/Engineer.550.1R-1EmulatingCast-in-PlaceDetailinginPrecastConcreteStructuresACI550.1R-01Thisreportprovidesengineerswithapracticalguidefordetailingprecastconcretestructuresthatshouldmeetbuildingcoderequirementsinallseis-micregionsbyemulatingcast-in-placereinforcedconcretedesign.Thisreportalsoprovidesinformationthatshowshowemulativeprecastcon-cretestructurescanaddressanyoralloftheprovisionsinaccordancewithACI318-99,includingthoseofChapter21,ifspecialattentionisdirectedtodetailingthejointsandsplicesbetweenprecastcomponents.Keywords:ductility;elasticdesign;emulation;flexuralstrength;joint;precastconcrete;precastdetailing;reinforcement.CONTENTSChapter1—Introduction,p.550.1R-2Chapter2—Generaldesignprocedures,p.550.1R-22.1—Selectingastructuralsystem2.1.1—Shearwalls2.1.2—Boxstructures2.1.3—Moment-resistingframes2.1.4—Dualsystems—framesandshearwalls2.2—Ductilityandhinges2.3—Designandanalysisprocedures2.3.1—Momentframes2.3.2—ShearwallsChapter3—Systemcomponents,p.550.1R-6Chapter4—Connectionofprecastelements,p.550.1R-74.1—Connectionsinwallsystems4.2—Connectionsinframesystems4.3—Otherconnections—floordiaphragms4.4—SpecialmaterialsanddevicesChapter5—Guidelinesforfabrication,transportation,erection,andinspection,p.550.1R-14Chapter6—Examplesofemulativeprecastconcretestructures,p.550.1R-15Chapter7—Summaryandconclusions,p.550.1R-15ReportedbyJointACI-ASCECommittee550RobertAustinJohnT.GuthrieCliffOhlwiler*DonaldBuettnerNeilM.HawkinsMichaelG.OlivaClintonCalvertMohammadIqbal*VictorF.Pizano-ThomenTe-Lin“Terry”ChungFrancisJ.Jacques‡SamiH.RizkallaNedCleland*L.S.PaulJohalKhaledA.SoudkiThomasJ.D’ArcyKenLuttrellJohnF.Stanton*AlvinC.Ericson*†RafaelMaganaP.JeffreyWangMelvynGalinatLesileD.MartinC.E.Warnes*MichaelGoffVilasMujumdar*ChairThecommitteeacknowledgesC.E.Warnes’contributionforprovidingtheinitialinformationonemulationtothecommittee.*MembersofACI550subcommitteewhopreparedthisreport.†Subcommitteechair.‡Deceased.550.1R-2ACICOMMITTEEREPORTChapter8—References,p.550.1R-158.1—Referencedstandardsandreports8.2—Citedreferences8.3—OtherreferencesCHAPTER1—INTRODUCTIONEmulativedetailingisdefinedasdesigningconnectionsystemsinaprecastconcretestructuresothatitsstructuralperformanceisequivalenttothatofaconventionallydesigned,cast-in-place,monolithicconcretestructure(EricsonandWarnes1990).Emulativedetailingisdifferentthanjointeddesignwhereprecastelementsareseparatedfromeachotherbutareconnectedwithspecialjointingdetailslikeweldedorboltedplates.Ascommonlyapplied,theterm“emulation”referstothedesignoftheverticalorhorizontalelementsofthelateral-force-resistingsystemofabuilding.Emulativedetailingofprecastconcretestructuresisapplicabletoanystructuralsystemwheremonolithicreinforcedconcretewouldalsobeappropriate,regardlessofseismicregion(Precast/PrestressedConcreteInstitute1999).Designpracticeinsomecountrieswithahighseismicrisk,suchasNewZealandandJapan,followdesigncodesthataddressprecastconcretedesignedbyemulationofcast-in-placeconcretedesign.PerformanceofjointsandrelateddetailsofemulativeprecastconcretestructuralconceptshavebeenextensivelytestedinJapan.Becauseemulativeprecastconcretestructureshavebeenconstructedthereforoverthreedecades,emulativemethodsforseismicdesignarewidelyaccepted.Untilrecently,thispracticehasnotbeenformallyfollowedintheU.S.Typicaldetailsshowingproportionaldimensions,aswellasreinforcingsteel,areschematiconlyandareprovidedsolelytodemonstratetheinteractivityofthejointingessentials.Allconnectiondetailswillbesubjecttostructuralanalysisandcompliancewithcontemporarycoderequirements.Atthetimeofthiswriting,splicingreinforcingbarsbyweldingorlappingwasnotpermittedbycodewheneverthebarsweresubjectedtostressesbeyondtheactualyieldpointsofthereinforcingsteelbeingused.AccordingtocertaintestsofmechanicalsplicesreportedbytheCaliforniaDepartmentofTransportation(Noureddine,Richards,andGrottkau1996),concernwasexpressedaboutstaggeringofmechanicalsplicesofreinforcin