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
