BS 8110-1-1997 Structural use of concrete — Part 1

BRITISHSTANDARDBS8110-1:1997IncorporatingAmendmentsNos.1and2Structuraluseofconcrete—Part1:CodeofpracticefordesignandconstructionICS91.080.40NOCOPYINGWITHOUTBSIPERMISSIONEXCEPTASPERMITTEDBYCOPYRIGHTLAWBS8110-1:1997ThisBritishStandard,havingbeenpreparedunderthedirectionoftheSectorBoardforBuildingandCivilEngineering,waspublishedundertheauthorityoftheStandardsBoardandcomesintoeffecton15March1997©BSI27May2002FirstpublishedAugust1985SecondeditionMarch1997ThefollowingBSIreferencesrelatetotheworkonthisstandard:CommitteereferenceB/525/2Draftforcomment95/105430DCISBN0580262081CommitteesresponsibleforthisBritishStandardThepreparationofthisBritishStandardwasentrustedbyTechnicalCommitteeB/525,Buildingandcivilengineeringstructures,toSubcommitteeB/525/2,Structuraluseofconcrete,uponwhichthefollowingbodieswererepresented:AssociationofConsultingEngineersBritishCementAssociationBritishPrecastConcreteFederationLtd.ConcreteSocietyDepartmentoftheEnvironment(BuildingResearchEstablishment)DepartmentoftheEnvironment(PropertyandBuildingsDirectorate)DepartmentofTransport(HighwaysAgency)FederationofCivilEngineeringContractorsInstitutionofCivilEngineersInstitutionofStructuralEngineersSteelReinforcementCommissionAmendmentsissuedsincepublicationAmd.No.DateComments9882September19981346827May2002IndicatedbyasidelineBS8110-1:1997©BSI27May2002iContentsPageCommitteesresponsibleInsidefrontcoverForewordvSection1.General1.1Scope11.2References11.3Definitions11.4Symbols3Section2.Designobjectivesandgeneralrecommendations2.1Basisofdesign52.2Structuraldesign52.3Inspectionofconstruction72.4Loadsandmaterialproperties82.5Analysis112.6Designsbasedontests12Section3.Designanddetailing:reinforcedconcrete3.1Designbasisandstrengthofmaterials153.2Structuresandstructuralframes183.3Concretecovertoreinforcement213.4Beams263.5Solidslabssupportedbybeamsorwalls373.6Ribbedslabs(withsolidorhollowblocksorvoids)473.7Flatslabs503.8Columns653.9Walls753.10Staircases803.11Bases813.12Considerationsaffectingdesigndetails83Section4.Designanddetailing:prestressedconcrete4.1Designbasis1014.2Structuresandstructuralframes1024.3Beams1034.4Slabs1104.5Columns1104.6Tensionmembers1114.7Prestressing1114.8Lossofprestress,otherthanfrictionlosses1114.9Lossofprestressduetofriction1134.10Transmissionlengthsinpre-tensionedmembers1154.11Endblocksinpost-tensionedmembers1164.12Considerationsaffectingdesigndetails116Section5.Designanddetailing:precastandcompositeconstruction5.1Designbasisandstabilityprovisions1235.2Precastconcreteconstruction1245.3Structuralconnectionsbetweenprecastunits1295.4Compositeconcreteconstruction133BS8110-1:1997ii©BSI27May2002PageSection6.Concrete,materials,specificationandconstruction6.1Materialsandspecification1376.2Concreteconstruction137Section7.Specificationandworkmanship:reinforcement7.1General1497.2Cuttingandbending1497.3Fixing1497.4Surfacecondition1497.5Lapsandjoints1507.6Welding150Section8.Specificationandworkmanship:prestressingtendons8.1General1518.2Handlingandstorage1518.3Surfacecondition1518.4Straightness1518.5Cutting1518.6Positioningoftendonsandsheaths1528.7Tensioningthetendons1528.8Protectionandbondofprestressingtendons1548.9Groutingofprestressingtendons155AnnexA(informative)Groutingofprestressingtendons156Index161Figure2.1—Shorttermdesignstress-straincurvefornormal-weightconcrete13Figure2.2—Shorttermdesignstress-straincurveforreinforcement13Figure2.3—Shorttermdesignstress-straincurveforprestressingtendons14Figure3.1—Flowchartofdesignprocedure20Figure3.2—Minimumdimensionsofreinforcedconcretemembersforfireresistance25Figure3.3—Simplifiedstressblockforconcreteatultimatelimitstate28Figure3.4—Systemofbent-upbars33Figure3.5—Shearfailurenearsupports33Figure3.6—Effectivewidthofsolidslabcarryingaconcentratedloadnearanunsupportededge38Figure3.7—Definitionofpanelsandbays39Figure3.8—ExplanationofthederivationofthecoefficientofTable3.1444Figure3.9—Divisionofslabintomiddleandedgestrips44Figure3.10—Distributionofloadonabeamsupportingatwo-wayspanningslab46Figure3.11—Typesofcolumnhead52Figure3.12—Divisionofpanelsinflatslabs54Figure3.13—Definitionofbreadthofeffectivemomenttransferstripbeforvarioustypicalcases59Figure3.14—Shearatslab-columnconnection60Figure3.15—Applicationof3.7.6.2and3.7.6.361BS8110-1:1997©BSI27May2002iiiPageFigure3.16—Definitionofashearperimeterfortypicalcases62Figure3.17—Zonesforpunchingshearreinforcement64Figure3.18—Shearperimeterofslabswithopenings65Figure3.19—Shearperimeterswithloadsclosetofreeedge65Figure3.20—Bracedslendercolumns71Figure3.21—Unbracedslendercolumns72Figure3.22—Biaxiallybentcolumn74Figure3.23—Criticalsectionforshearcheckinapilecap84Figure3.24—Simplifieddetailingrulesforbeams97Figure3.25—Simplifieddetailingrulesforslabs98Figure5.1—Continuityofties:barsinprecastmemberlappedwithbarininsituconcrete124Figure5.2—Continuityofties:anchoragebyenclosinglinks125Figure5.3—Continuityofties:barslappedwithinin-situconcrete125Figure5.4—Schematicarrangementofallowanceforbearing127Table2.1—Loadcombinationsandvaluesof
ffortheultimatelimitstate9Table2.2—V