混凝土配筋用钢可焊钢筋棒材卷材和开卷产品规范.doc

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reinforcingsteel—Bar,
coilanddecoiled
product—
Specification
;
Steelforthe
reinforcementof
concrete—Weldable
BRITISHSTANDARDBS4449:
+A2:
.yang64>#ff66ff'>
BS4449:+A2:20
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ThisBritishStandardwas
publishedundertheauthority
oftheStandardsPolicyand
StrategyCommittee
on<#004699'>30September
Firstpublished:
BS4449:April1969
BS4461:March1969
Firstrevision:
BS4449:May1978
BS4461:May1978
Secondcombinedversionas:
BS4449:May1988
Thirdcombinedversionas:
BS4449:May1997
ThefollowingBSIreferences
relatetotheworkonthis
BritishStandard:
CommitteereferenceISE/9/1
Draftforcomment
04/<#004699'>30109891DC
??BSI
ISBN978058064585<#004699'>3
BritishPrecastConcreteFederation
ConcreteSociety
DepartmentofTransport—HighwaysAgency
GalvanizersAssociation
InstitutionofStructuralEngineers
UKCertificationAuthorityforReinforcingSteels
UKSteelAssociation
Amendmentsissuedsincepublication
DateComments
1710<#004699'>3<#004699'>30AprilSeeforeword
Seeforeword
.
<#004699'>31March
Committeesresponsibleforthis
BritishStandard
ThepreparationofthisBritishStandardwasentrustedbyTechnical
CommitteeISE/9,Steelforconcretereinforcement,toSubcommitteeISE/9/1,
Bars,wireandfabricforconcretereinforcement,uponwhichthefollowing
bodieswererepresented:
BritishCoatingsFederation
09
??BSI
BS4449:+A2:
.yang6#ff66ff'>
Contents
Page
CommitteesresponsibleInsidefrontcover
Forewordii
1Scope1
2Normativereferences1
<#004699'>3Termsanddefinitions1
4Symbols<#004699'>3
5Designations<#004699'>3
6Steelmakingandmanufacturingprocesses<#004699'>3
7Productcharacteristics5
8Evaluationofconformity10
9Testmethods1<#004699'>3
10Identification1<#004699'>3
11Verificationofpropertiesinthecaseofdispute15
AnnexA(normative)Bondtestforribbedreinforcingsteel—Beamtest16
AnnexB(normative)Materialnotcoveredbyathirdpartyproduct
certificationscheme2<#004699'>3
AnnexC(normative)Identificationrequirements25
Bibliography27
Figure1—Ribgeometryexamplewithtworowsoftransverseribs9
Figure2—ExampleofribpatternforgradeB500A14
Figure<#004699'>3—ExampleofribpatternforgradeB500B14
Figure4—ExampleofribpatternforgradeB500C14
—DimensionsofthehingeforbeamtypeA(d&lt;16mm)16
—DimensionsofthehingeforbeamtypeB(dW16mm)17
FigureA.<#004699'>3—BeamtesttypeA(d&lt;16mm)17
—BeamtesttypeB(dW16mm)18
—BondtesttypeA(d&lt;16mm)—Reinforcementof
beamspecimens20
—BondtesttypeB(dW16mm)—Reinforcementof
beamspecimens21
—Exampleofmanufacturer’sidentificationmark(using
widenedribs)25
Table1—Listofsymbols4
Table2—Chemicalcomposition(maximum%bymass)5
Table<#004699'>3—Conditionsoftestingthemechanicalproperties5
Table4—Characteristictensileproperties6
Table5—Fatiguetestconditions6
Table6—Mandreldiametersforrebendtest7
Table7—Nominalcross-sectionalareaandmasspermetre8
Table8—Rangesfortheribparameters9
Table9—Characteristicrelativeribarea9
Table10—Absoluteminimumandmaximumvaluesoftensileproperties11
Table11—Coefficientkasafunctionofthenumbernoftestresults(for
areliablefailurerateof5%[p=]ataprobabilityof90%)12
Table12—Coefficientkasafunctionofthenumbernoftestresults(for
areliablefailurerateof10%[p=]ataprobabilityof90%)1<#004699'>3
—Seriesofreinforcingsteeldiametersfortestingofbond18
—Identificationofthecountryoforigin26
i
ii
BS4449:+A2:2
.yang6#ff66ff'>
+A2:supersedesBS4449:+A1:,

strengthhasbeenincreasedto500MPa,andathirdductilityclasshasbeen
added,comparedtoBS4449:1997.

12mmincoil,plainroundwireofgrade250MPahasbeenincorporatedinto
,fordowelbarapplications,referenceshouldbemadeto
BSEN10025-,referenceshould
bemadetoBSEN1<#004699'>3877-<#004699'>3.
Thisstandardhasbeenwrittensothatitcanbeusedinconjunctionwith
BSEN10080:.Definitions,symbols,steelmakingandmanufacturing
processes,routineinspectionandtesting,testmethods,identificationofthe
manufacturerandtechnicalclassandverificationofmechanicalpropertiesinthe
caseofdisputearealltakenfromBSEN10080:.
BSEN10080:doesnotdefinesteelgradesortechnicalclasses,andrequires
thattechnicalclassesshouldbedefinedinaccordancewithBSEN10080:,
byspecifiedvaluesofRe,Rm/Re,Agt,Re,act/Re,nom(whereappropriate),fatigue
strength,bendperformance,weldability,bondstrength,tolerancesand

requirementsofBSEN10080:.
Thethreegradesinthisstandardalsoconformtothethreerecommended
ductilityclassesofBSEN1992-1-1:,althoughthefatiguerequirementsand
thefatiguetestconditionsareretainedfromthepreviousversionofthisstandard.
TheonlyexceptiontothisisforgradeB500Ainsizesbelow8mm,wherethe
ductilityrequirementsspecifiedarebelowthoseofBSEN1992-1-1:.
BSEN10080:containsaninformativeAnnexZA,whichdescribeshowthat

,8.<#004699'>:relatetotheroleofthenotifiedbody
inassessingproductsforanECcertificateofconformity,andassucharenot

materialsproducedtoitshouldmeettherequirementsforCEmarking.
WhereCEmarkingisrequiredforthepurposesofcomplyingwiththeEU
ConstructionProductsDirective,BSEN10080:applies.
Itisrecommendedthatpurchasersspecifyreinforcingsteelthathasbeen
manufacturedandsuppliedtoarecognizedthirdpartyproductcertification

,AnnexBprovidesabatchtestingmethodfor
materialwhichhasnotbeenproducedundersuchascheme.
InBSEN10080,theterms“rod”and“wire”areusedtodescribereinforcingsteel
,thesetermshavenotbeenincludedtoavoidthepotential
forconfusion,particularlywithwireproducedtoBS4482.
Thisstandardcomesintoeffecton1January.
Inthepreviousrevisionofthisstandard,bondwasspecifiedbymeansofa
projectedribarea,withapull-outtestspecifiedasanalternativemeansof
demonstratingcompliancewiththebondrequirementsofBS8110-
revision,,a
beamtestisprovidedinAnnexA,whichmaybeusedtodemonstrate

demonstratecompliancewithBS8110-1,thenthepull-outtestmaybeused.
Thispull-outtestalternativemayonlybeappliedtosteelsofgradeB500A.