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BRITISHSTANDARDBS8110-1:1997IncorporatingAmendmentNo.1Structuraluseofconcrete—Part1:CodeofpracticefordesignandconstructionICS91.080.40BS8110-1:1997ThisBritishStandard,havingbeenpreparedunderthedirectionoftheSectorBoardforBuildingandCivilEngineering,waspublishedundertheauthorityoftheStandardsBoardandcomesintoeffecton15March1997©BSI06-1999FirstpublishedAugust1985SecondeditionMarch1997ThefollowingBSIreferencesrelatetotheworkonthisstandard:CommitteereferenceB/525/2Draftforcomment95/105430DCISBN0580262081CommitteesresponsibleforthisBritishStandardThepreparationofthisBritishStandardwasentrustedbyTechnicalCommitteeB/525,Buildingandcivilengineeringstructures,toSubcommitteeB/525/2,Structuraluseofconcrete,uponwhichthefollowingbodieswererepresented:AssociationofConsultingEngineersBritishCementAssociationBritishPrecastConcreteFederationLtd.ConcreteSocietyDepartmentoftheEnvironment(BuildingResearchEstablishment)DepartmentoftheEnvironment(PropertyandBuildingsDirectorate)DepartmentofTransport(HighwaysAgency)FederationofCivilEngineeringContractorsInstitutionofCivilEngineersInstitutionofStructuralEngineersSteelReinforcementCommissionAmendmentsissuedsincepublicationAmd.No.DateComments9882September1998IndicatedbyasidelineinthemarginBS8110-1:1997©BSI06-1999iContentsPageCommitteesresponsibleInsidefrontcoverForewordvSection1.General1.1Scope11.2References11.3Definitions11.4Symbols3Section2.Designobjectivesandgeneralrecommendations2.1Basisofdesign42.2Structuraldesign42.3Inspectionofconstruction62.4Loadsandmaterialproperties72.5Analysis102.6Designsbasedontests11Section3.Designanddetailing:reinforcedconcrete3.1Designbasisandstrengthofmaterials133.2Structuresandstructuralframes153.3Concretecovertoreinforcement183.4Beams233.5Solidslabssupportedbybeamsorwalls333.6Ribbedslabs(withsolidorhollowblocksorvoids)423.7Flatslabs453.8Columns593.9Walls663.10Staircases713.11Bases723.12Considerationsaffectingdesigndetails74Section4.Designanddetailing:prestressedconcrete4.1Designbasis904.2Structuresandstructuralframes914.3Beams914.4Slabs994.5Columns994.6Tensionmembers994.7Prestressing994.8Lossofprestress,otherthanfrictionlosses994.9Lossofprestressduetofriction1014.10Transmissionlengthsinpre-tensionedmembers1034.11Endblocksinpost-tensionedmembers1034.12Considerationsaffectingdesigndetails104Section5.Designanddetailing:precastandcompositeconstruction5.1Designbasisandstabilityprovisions1105.2Precastconcreteconstruction1115.3Structuralconnectionsbetweenprecastunits1165.4Compositeconcreteconstruction119Section6.Concrete,materials,specificationandconstruction6.1Materialsandspecification1236.2Concreteconstruction123BS8110-1:1997ii©BSI06-1999PageSection7.Specificationandworkmanship:reinforcement7.1General1357.2Cuttingandbending1357.3Fixing1357.4Surfacecondition1367.5Lapsandjoints1367.6Welding136Section8.Specificationandworkmanship:prestressingtendons8.1General1388.2Handlingandstorage1388.3Surfacecondition1388.4Straightness1388.5Cutting1388.6Positioningoftendonsandsheaths1398.7Tensioningthetendons1398.8Protectionandbondofprestressingtendons1418.9Groutingofprestressingtendons142AnnexA(informative)Groutingofprestressingtendons143Index146Figure2.1—Shorttermdesignstress-straincurvefornormal-weightconcrete11Figure2.2—Shorttermdesignstress-straincurveforreinforcement12Figure2.3—Shorttermdesignstress-straincurveforprestressingtendons12Figure3.1—Flowchartofdesignprocedure17Figure3.2—Minimumdimensionsofreinforcedconcretemembersforfireresistance22Figure3.3—Simplifiedstressblockforconcreteatultimatelimitstate25Figure3.4—Systemofbent-upbars29Figure3.5—Shearfailurenearsupports29Figure3.6—Effectivewidthofsolidslabcarryingaconcentratedloadnearanunsupportededge34Figure3.7—Definitionofpanelsandbays34Figure3.8—ExplanationofthederivationofthecoefficientofTable3.1439Figure3.9—Divisionofslabintomiddleandedgestrips39Figure3.10—Distributionofloadonabeamsupportingatwo-wayspanningslab41Figure3.11—Typesofcolumnhead47Figure3.12—Divisionofpanelsinflatslabs49Figure3.13—Definitionofbreadthofeffectivemomenttransferstripbeforvarioustypicalcases53Figure3.14—Shearatslab-columnconnection54Figure3.15—Applicationof3.7.6.2and3.7.6.355Figure3.16—Definitionofashearperimeterfortypicalcases56Figure3.17—Zonesforpunchingshearreinforcement57Figure3.18—Shearperimeterofslabswithopenings58Figure3.19—Shearperimeterswithloadsclosetofreeedge58Figure3.20—Bracedslendercolumns63BS8110-1:1997©BSI06-1999iiiPageFigure3.21—Unbracedslendercolumns64Figure3.22—Biaxiallybentcolumn66Figure3.23—Criticalsectionforshearcheckinapilecap75Figure3.24—Simplifieddetailingrulesforbeams86Figure3.25—Simplifieddetailingrulesforslabs87Figure5.1—Continuityofties:barsinprecastmemberlappedwithbarininsituconcrete111Figure5.2—Continuityofties:anchoragebyenclosinglinks112Figure5.3—Continuityofties:barslappedwithininsituconcrete112Figure5.4—Schematicarrangementofallowanceforbearing114Table2.1—Loadcombinationsandvaluesof¾ffortheultimatelimitstate8Table2.2—Valuesof¾mfortheultimatelimitstate9Table3.1—Strengthofreinforcement15Table3.2—Classific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