BS EN 13377-2002 Prefabricated timber formwork beams - Requirements classification and assessment《预制木构架梁 要求、分类和评定》.pdf

1、BRITISH STANDARD BS EN 13377:2002 Prefabricated timber formwork beams Requirements, classification and assessment The European Standard EN 13377:2002 has the status of a British Standard ICS 91.220 BS EN 13377:2002 This British Standard, having been prepared under the direction of the Building and C

2、ivil Engineering Sector Policy and Strategy Committee, was published under the authority of the Standards Policy and Strategy Committee on 5 December 2002 BSI 5 December 2002 ISBN 0 580 40939 2 National foreword This British Standard is the official English language version of EN 13377:2002. The UK

3、participation in its preparation was entrusted by Technical Committee B/514, Access and support equipment, to Subcommittee B/514/26, Falsework, which has the responsibility to: A list of organizations represented on this subcommittee can be obtained on request to its secretary. Attention is drawn to

4、 National Annex NA (informative) which contains additional information and explanations for UK users. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International

5、 Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British St

6、andard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and Euro

7、pean developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 28, an inside back cover and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amen

8、dments issued since publication Amd. No. Date CommentsEUROPEANSTANDARD NORMEEUROPENNE EUROPISCHENORM EN13377 August2002 ICS91.220 Englishversion PrefabricatedtimberformworkbeamsRequirements, classificationandassessment PoutrellesdecoffrageprfabriquesenboisExigences, classificationetvaluation Industr

9、iellgefertigteSchalungstrgerausHolz Anforderungen,KlassifizierungundNachweis ThisEuropeanStandardwasapprovedbyCENon29May2002. CENmembersareboundtocomplywiththeCEN/CENELECInternalRegulationswhichstipulatetheconditionsforgivingthisEurope an Standardthestatusofanationalstandardwithoutanyalteration.Upto

10、datelistsandbibliographicalreferencesconcernings uchnational standardsmaybeobtainedonapplicationtotheManagementCentreortoanyCENmember. ThisEuropeanStandardexistsinthreeofficialversions(English,French,German).Aversioninanyotherlanguagemadebytra nslation undertheresponsibilityofaCENmemberintoitsownlan

11、guageandnotifiedtotheManagementCentrehasthesamestatusasthe official versions. CENmembersarethenationalstandardsbodiesofAustria,Belgium,CzechRepublic,Denmark,Finland,France,Germany,Greece, Iceland,Ireland,Italy,Luxembourg,Malta,Netherlands,Norway,Portugal,Spain,Sweden,SwitzerlandandUnitedKingdom. EUR

12、OPEANCOMMITTEEFORSTANDARDIZATION COMITEUROPENDENORMALISATION EUROPISCHESKOMITEEFRNORMUNG ManagementCentre:ruedeStassart,36B1050Brussels 2002CEN Allrightsofexploitationinanyformandbyanymeansreserved worldwideforCENnationalMembers. Ref.No.EN13377:2002EEN13377:2002(E) 2 Contents page Foreword3 Introduc

13、tion .4 1 Scope 4 2 Normativereferences 4 3 Terms,definitionsandsymbols .5 4 Classification8 5 Performancerequirements .8 6 Prototypeassessment .11 7 Evaluationofconformity .11 8 Ongoingproductioninspection . 12 9 Marking .12 10 Instructionsforuse . 12 AnnexA (normative) Testandcalculationmethodstoe

14、stablishstructuralparameters.13 AnnexB (normative) Statisticalanalysisoftestresultsforthecalculationofthecharacteristicvalue 18 AnnexC (normative) Minimumrequirementsforproductioncontrol 19 AnnexD (normative) Testproceduresforbeamswithwebsconformingto5.2.2.c)21 AnnexE (informative) Valuesforuseincal

15、culationforsiteuse 24 AnnexF (informative) Ongoingproductioninspection26 Bibliography 27EN13377:2002(E) 3 Foreword ThisdocumentEN13377:2002hasbeenpreparedbyTechnicalCommitteeCEN/TC 53“Temporaryworks equipment“,thesecretariatofwhichisheldbyDIN. ThisEuropeanStandardshallbegiventhestatusofanationalstan

16、dard,eitherbypublicationofanidenticaltextor byendorsement,atthelatestbyFebruary2003,andconflictingnationalstandardsshallbewithdrawnatthelatest byFebruary2003. TheannexesA,B,CandDarenormative,theannexesEandFareinformative. AccordingtotheCEN/CENELECInternalRegulations,thenationalstandardsorganizations

17、ofthefollowing countriesareboundtoimplementthisEuropeanStandard:Austria,Belgium,CzechRepublic,Denmark,Finland, France,Germany,Greece,Iceland,Ireland,Italy,Luxembourg,Malta,Netherlands,Norway,Portugal,Spain, Sweden,SwitzerlandandtheUnitedKingdom.EN13377:2002(E) 4 Introduction ThisEuropeanStandardisap

18、roductstandardprimarilyforuseinthefieldoffalseworkandformwork. Formworkbeamsshouldbemadesothatthepropertiesspecifiedinclause5areretainedundersiteconditions suchasexposuretowater,watervapourandcement. WhilstthisEuropeanStandarddealswiththetwomostcommontypesofprefabricatedtimberformworkbeamsinuse itis

19、notintendedtopreventdevelopmentofothertypesofformworkbeamsmadeoftimberandwoodbased materials. Researchanddevelopmentinthefieldofpanelmaterialsiscontinuous.Evenifformworkbeamsaremadewith materialswhichdonotconformwiththisEuropeanStandard,theprinciplesofthisEuropeanStandardshouldbe consideredinthedesi

20、gnandassessmentofsuchbeams. ToobtaintestresultsandtheirstatisticalevaluationannexesAandBrespectivelycanbeused.Thevaluesfor strengthandstiffnessgiveninTables1and2havebeenestablishedfromexperience.Tousethesevalues,the partialsafetyfactorforactions, g F ,shouldbetakenintoaccountaswellasthepartialsafety

21、factorforthematerial, g M , andmodificationfactor, k mod ,fortimber,(seeENV199511).AnnexEgivessomeguidance.Formoreinformationon timberseetheBibliographyinannexF. 1Scope ThisEuropeanStandardspecifiesclassification,requirementsandassessmentproceduresforprefabricatedtimber formworkbeams.Italsogivesinfo

22、rmationonproductioncontrolrequirements. Prefabricatedtimberformworkbeamsareintendedforuseinfalseworkandformworkandtobeloadedinthe directionofthebeamdepth. Theyareofglued I shapedconstructionconsistingoftwoidenticalflangemembersofsolidtimberconnectedbya singlewebofwoodbasedmaterialwithbeamdepthsof160

23、mm,200mmand240mm,orconnectedbyoralatticeof solidtimbermemberswithabeamdepthof240mmbeamdepth. 2 Normativereferences ThisEuropeanStandardincorporatesbydatedorundatedreference,provisionsfromotherpublications.These normativereferencesarecitedattheappropriateplacesinthetext,andthepublicationsarelistedher

24、eafter.For datedreferences,subsequentamendmentstoorrevisionsofanyofthesepublicationsapplytothisEuropean Standardonlywhenincorporatedinitbyamendmentorrevision.Forundatedreferencesthelatesteditionofthe publicationreferredtoapplies(includingamendments). EN301, Adhesives,phenolicandaminoplasticforloadbe

25、aringtimberstructuresClassificationandperformance requirements. EN310, WoodbasedpanelsDeterminationofmodulusofelasticityinbendingandofbendingstrength. EN317, ParticleboardsandfibreboardsDeterminationofswellinginthicknessafterimmersioninwater. EN319,ParticleboardsandfibreboardsDeterminationoftensiles

26、trengthperpendiculartotheplaneofthe board. EN323, WoodbasedpanelsDeterminationofdensity.EN13377:2002(E) 5 EN338, StructuraltimberStrengthclasses. EN385:1995, FingerjointedstructuraltimberPerformancerequirementsandminimumproductionrequirements. EN408,TimberstructuresSolidtimberandgluedlaminatedtimber

27、Determinationsofsomephysicaland mechanicalproperties. EN518, StructuraltimberGradingRequirementsforvisualstrengthgradingstandards. EN519, StructuraltimberGradingRequirementsformachinestrengthgradedtimberandgradingmachines. EN6363, PlywoodSpecificationsPart3:Requirementsforplywoodforuseinexteriorcond

28、itions. ENV199511:1993, EUROCODE5:DesignoftimberstructuresPart11:Generalrulesandrulesforbuildings. EN131832, MoisturecontentofapieceofsawntimberPart2:Estimationbyelectricalresistancemethod. prEN13353, SolidwoodpanelsRequirements. prEN13354, SolidwoodpanelsBondingqualityTestmethod. 3 Terms,definition

29、sandsymbols 3.1 Termsanddefinitions FortheapplicationofthisEuropeanStandard,thefollowingtermsanddefinitionsapply. 3.1.1 formworkbeam beaminformworkconstructionandloadedinthedirectionofthebeamdepth 3.1.2 timberformworkbeam gluedprefabricatedIshapedbeamconsistingoftwoidenticalflangemembersofsolidtimbe

30、rconnectedbyaweb ofwoodbasedpanelmaterialoralatticeofsolidtimbermembers 3.1.3 panelwebbeam timberformworkbeaminwhichthewebismadeofawoodbasedpanelmaterial(seeFigure1a) 3.1.4 latticewebbeam timberformworkbeammadewithlatticestruts(seeFigure1b). 3.1.5 latticestrut member,positioneddiagonallyoratrightang

31、lestotheflange,whichconnectstwoparallelflangemembers(see Figure1b)EN13377:2002(E) 6 Key H Depthofbeam b Flangewidth h Depth(thickness)offlange t Thicknessofweb Key 1 Flange 2 Panelweb 3 Verticalstrut 4 Diagonalstrut a) Panelwebbeam(typeP) b) Latticewebbeam(typeL) Figure1Timberformworkbeams Generalco

32、nstructionandsymbolsusedforthedimensions 3.2Symbols Theprincipalsymbolsusedinthisstandardarelistedbelow:EN13377:2002(E) 7 Number Symbol Denomination Unit 1 a moduleofthelatticewebbeam mm 2 b flangewidth mm 3 e distanceofproportionatloadpositions 4 E modulusofelasticity kN/mm 2 5 E I bendingstiffness

33、 kNm 2 6 F action kN 7 H depthofbeam mm 8 h depth(thickness)offlange mm 9 I secondmomentofarea mm 4 10 k mod modificationfactor 11 k s statisticalfactor 12 L spanofbeam m 13 M bendingresistance kNm 14 n numberofspecimens 15 R resistance kN/mm 2 16 s standarddeviation 17 t thicknessofweb mm 18 V shea

34、rresistance kN 19 W sectionmodulus mm 3 20 y meanvalue 21 y i singlevalue 22 g F partialsafetyfactorforactions 23 g M partialsafetyfactorformaterial Subscripts 24 .b bearing 25 .d designlevelinlimitstate 26 .i typical/anyvalue 27 .k characteristicvalue(limitstate) 28 .m “supportedbetweennodepoints“

35、29 .mod modification 30 .n “supportedatnodepoint“ 31 .s statistical 32 .u ultimate(limitstate) 33 .y valuerelatedtotransformedvalues 34 .5 5%quantilevalueEN13377:2002(E) 8 4Classification Thisstandardspecifiestypesofbeam;theclassificationisbasedon: thewebconstruction: TypePforapanelwebbeam; TypeLfor

36、alatticewebbeam; theoveralldepth, H:thetwodigitsintheidentificationsymbolsrepresentthedepthincentimetres. ThenominalloadbearingandrigiditypropertiesforeachclassarelistedinTables1and2. ForclassificationseeTables1and2.Theidentificationsymbolsaregivenincolumn1ofTables1and2. Table1Classification,dimensi

37、onsandstructuralpropertiesofpanelwebbeams 12 3 4567 Class beamdepth Hmm minimumflangewidth bmm E I kNm 2 V k kN R b,k kN M k kNm P16 160 65 200 18,4 36,8 5.9 P20 200 80 450 23,9 47,8 10.9 P24 240 80 700 28,2 56,4 14.1 NOTE1 Forexplanationofsymbols,see3.2. NOTE2 Forcalculationof”safeworkingloads”,see

38、annexE. Table2Classification,dimensionsandstructuralpropertiesoflatticewebbeams 123456789 R b,n,k kN R b,m,k kN M n,k kNm M m,k kNm Class beam depth H mm minimum flange width b mm E I kNm 2 V k kN supported atnodes supported inbetween nodes supported atnodes supported inbetween nodes L24 240 80 800

39、28,2 60,7 43,4 15,2 8,7 NOTE1 Forexplanationofsymbols,see3.2. NOTE2 Forcalculationof”safeworkingloads”,seeannexE. Toobtaintherequiredbearingarea,thelateralcompressionstrengthforthestrengthclassC24with5,3N/mmin accordancewithEN338:1995shallbeused. 5Performance requirements 5.1General Beamsshallconfor

40、mtotherequirementsofthisclauseaccordingtotheirclass.Conformitywiththerequirements shallbeverified,seeclauses6and7,andmanufacturingshallbesubjecttoproductioncontrol,seeclause8and annexC.EN13377:2002(E) 9 Allrequirementsshouldbemetwithamoisturecontentofsolidtimbermembersof(122)%(manufacturing targetmo

41、isturecontent). 5.2 Materialandassemblyrequirements 5.2.1 Solidtimbercomponentsstrengthclass MembersofsolidtimbershallatleastconformtostrengthclassC24ofEN338. NOTE Itisrecommendedthatthegrowthringwidthislessthan4mmandtheamountofcompressionwooddoesnot exceed20%. 5.2.2 Woodbasedpanelcomponents Thewebs

42、hallbemadeofoneofthefollowingmaterials: a) plywoodconformingtoEN6363; b) solidwoodpanelsforuseinexteriorconditionsconformingtoprEN13353; c) anyotherwoodbasedmaterial,whichconformsafterpassingthewetdrycyclictest(seeannexD)withthe subsequentrequirements: i) tensionstrengthperpendiculartotheplanedeterm

43、inedinaccordancewithEN319shallnotbelessthan 0,1N/mm 2 (seeD.3.1);and ii) irreversibleswellingshallnotexceed20%(seeD.3.2). Thefollowingpropertiesofthiswoodbasedmaterialshallbemadeavailable: densityestablishedinaccordancewithEN323; bendingstrengthestablishedinaccordancewithEN310; thicknessswellingestablishedinaccordancewithEN317; internalbondestablishedinaccordancewithEN319. Theestablishedpropertiesshallbeusedasrequirementsforproductioncontrol(seeannexC). 5.2.3 Shearstrengthofthegluelineinbeamsectionswithwebsconformingto5.2.2c AfterapplyingthewetdrycyclictestingproceduregiveninannexD,themean