SIST EN 386:2002

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Lepljeni lamelirani les - Zahteve za uporabo in minimalne zahteve za proizvodnjoBrettschichtholz - Leistungsanforderungen und Mindestanforderungen an die HerstellungBois lamellé collé - Exigences de performance et exigences minimales de fabricationGlued laminated timber - Performance requirements and minimum production requirements79.060.99Other wood-based panelsICS:Ta slovenski standard je istoveten z:EN 386:2001SIST EN 386:2002en01-julij-2002SIST EN 386:2002SLOVENSKI
STANDARDSIST EN 386:19961DGRPHãþD



SIST EN 386:2002



EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 386October 2001ICS 79.060.99Supersedes EN 386:1995English versionGlued laminated timber - Performance requirements andminimum production requirementsBois lamellé collé - Exigences de performance et exigencesminimales de fabricationBrettschichtholz - Leistungsanforderungen undMindestanforderungen an die HerstellungThis European Standard was approved by CEN on 3 September 2001.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Management Centre or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2001 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 386:2001 ESIST EN 386:2002



EN 386:2001 (E)2ContentspageForeword.3Introduction.41Scope.42Normative references.43Terms and definitions.54Symbols.65Requirements.65.1General.65.2Timber.65.3Adhesives.75.4End joints in laminations.75.5Glue line integrity and strength.76Manufacturing requirements.86.1Production conditions.86.2Timber.106.3Adhesives.116.4Manufacture.117Quality Control.137.1Factory production control.137.2Organization of factory production control.147.3Documentation of the quality control system.147.4Inspection and testing.15SIST EN 386:2002



EN 386:2001 (E)3ForewordThis European Standard has been prepared by Technical Committee CEN/TC 124 "Timber structures", thesecretariat of which is held by DS.This European Standard supersedes EN 386:1995.This European Standard shall be given the status of a national standard, either by publication of an identical text orby endorsement, at the latest by April 2002, and conflicting national standards shall be withdrawn at the latest byApril 2002.According to the CEN/CENELEC Internal Regulations, the national standards organizations of the followingcountries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland,France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden,Switzerland and the United Kingdom.SIST EN 386:2002



EN 386:2001 (E)4IntroductionGlued laminated timber is obtained by bonding together a number of laminations having their grain essentiallyparallel. In this way a member with a rectangular solid cross-section can be produced.The purpose of the requirements in this standard is to obtain reliable and durable bonding, so that the bonds in theglued laminated timber will maintain their integrity throughout the intended life of the structure. The requirementswill need to be supplemented to take into consideration special production conditions, materials or functionalrequirements. The requirements apply to structural members of service classes 1 and 2. For timber structures ofservice class 3 special precautions shall be taken, for example weather resistant adhesives shall be used. Therequirements for these are given in EN 301.1 ScopeThis standard specifies requirements for the components of glued laminated timber members and minimumrequirements for the production of such members for structural use.This standard is applicable to products with a finished lamination thickness of not more than 45 mm.Although most glued laminated timber is made from coniferous species this standard also applies to broad leavedspecies if information is available to enable them to be satisfactorily bonded.2 Normative referencesThis European Standard incorporates by dated or undated reference, provisions from other publications. Thesenormative references are cited at the appropriate places in the text, and the publications are listed hereafter. Fordated references, subsequent amendments to or revisions of any of these publications apply to this EuropeanStandard only when incorporated in it by amendment or revision. For undated references the latest edition of thepublication referred to applies (including amendments).EN 301, Adhesives, phenolic and aminoplastic for load-bearing timber structures - Classification andperformance requirements.EN 385:2001, Finger jointed structural timber - Performance requirements and minimum productionrequirements.EN 391:2001, Glued laminated timber - Delamination test of glue lines.EN 392, Glued laminated timber - Shear test of glue lines.prEN 14081-1:2000, Timber structures - Strength graded structural timber with rectangular crosssection - Part 1: General requirements.prEN 14081-2:2000 ,Timber structures - Strength graded structural timber with rectangular crosssection - Part 2: Machine Grading - Additional requirements for initial type testing.prEN 14081-3:2000, Timber structures - Strength graded structural timber with rectangular crosssection - Part 3: Machine Grading - Additional requirements for factory production control.SIST EN 386:2002



EN 386:2001 (E)53 Terms and definitionsFor the purposes of this European Standard the following terms and definitions given in EN 391 and the followingapply:3.1adhesive typeadhesive types I and II, see EN 3013.2glued laminated timber (glulam)structural member formed by bonding together timber laminations with their grain running essentially parallel3.3horizontal glulamglued laminated timber with the glue line planes perpendicular to the long length of the cross section, see Figure 1a3.4vertical glulamglued laminated timber with the glue line planes perpendicular to the short length of the cross section, see Figure 1b3.5service class 1service class characterized by a moisture content in the materials corresponding to a temperature of 20 °C and therelative humidity of the surrounding air only exceeding 65 % for a few weeks per yearNOTE
In service class 1 the average equilibrium moisture content in most softwoods will not exceed 12 %.3.6service class 2service class characterized by a moisture content in the materials corresponding to a temperature of 20 °C and therelative humidity of the surrounding air only exceeding 85 % for a few weeks per yearNOTE
In service class 2 the average equilibrium moisture content in most softwoods will not exceed 20 %.3.7service class 3service class characterized by climatic conditions leading to higher moisture contents than service class 23.8maximum delamination percentagesee EN 3913.9total delamination percentagesee EN 3913.10wood failure percentagesee EN 392SIST EN 386:2002



EN 386:2001 (E)6a) Horizontal glulamb) Vertical glulamFigure 1 - Glue lines in cross sections showing the normal position of the glue lines4 SymbolsAarea, in square millimetres;fmbending strength of a single end joint, in newtons per square millimetre;fm,kcharacteristic bending strength of the end joints in the lamination, in newtons per square millimetre;fm,dc,kdeclared characteristic flatwise bending strength of the end joints, in newtons per square millimetre;fm,15,kcharacteristic bending strength of 15 tested end joints, in newtons per square millimetre;fvshear strength, in newtons per square millimetre;rradius of curvature, in millimetres;tlamination thickness, in millimetres.5 Requirements5.1 GeneralThe used timber is defined by its strength class or strength properties and the bonding operations shall result inreliable and durable bonds.These general requirements shall be considered satisfied if both the requirements in this clause and the minimumproduction requirements in clause 6 are fulfilled.5.2 TimberThe timber shall be strength graded in conformity with either prEN 14081-1, prEN 14081-2 or prEN 14081-3.SIST EN 386:2002



EN 386:2001 (E)75.3 AdhesivesThe adhesive shall enable joints of such strength and durability to be produced in order that the integrity of thebond is maintained throughout the intended lifetime of the structure.Acceptable strength and durability can be achieved by the use of an adhesive of type I and shall meet therequirements for this type given in EN 301. Or, for structures in service class 1 or 2 an adhesive of type II accordingto EN 301 can be used, provided the temperature of the member in the structure will always be below 50 ºC.NOTE 1
For the lamination and the end jointing, the adhesive should be chosen considering the climatic conditions in service, thetimber species, the preservative used (if any) and the production methods.NOTE 2
Such strength and durability can be achieved by a polycondensation adhesive of the phenolic or aminoplastic type asdefined in EN 301.For adhesives of other types than covered by EN 301 a bond with equivalent durability and strength shall beachieved. Special considerations shall be given to creep failure, the ability to maintain structural integrity during fireand elevated temperature and moisture conditions in ordinary service.5.4 End joints in laminationsThe characteristic bending strength fm,k obtained from flatwise bending tests of the end joints shall meet thefollowing requirement:fm,k fm,dc,kwherefm,dc,k is the declared characteristic bending strength.The flatwise bending tests shall be performed in conformity with EN 385.The characteristic bending strength shall be determined from the Log-Normal probability distribution function.5.5 Glue line integrity and strength5.5.1The requirements for glue line integrity shall be based on testing of the glue line in a full cross-sectionalspecimen, cut from the manufactured glulam member. The specimens shall be representative of the manufacture.5.5.2For structures of service class 3, delamination tests shall be made in conformity with method A of EN 391.For structures of service class 1 or 2 the testing shall be either delamination tests in conformity with method A ofEN 391 or block shear tests in conformity with EN 392.NOTE
For routine quality control the test methods specified may be substituted by the following: Delamination method A maybe substituted by delamination method B of EN 391:2001. For members to be used in service class 1 or 2 block shear tests maybe substituted by delamination method C of EN 391:2001.5.5.3Depending on the method and number of cycles the total delamination percentage of each cross-sectionalspecimen shall be less than the values given in Table 1.SIST EN 386:2002



EN 386:2001 (E)8Table 1 - Maximum values for the total delamination percentagesMethodApplicable to adhesive typeMax. total delamination percentage after cycle no.:123ABCType IType IType II-41058-10--For all delamination methods the maximum delamination percentage shall be less than or equal to 40 %.5.5.4Each test result from the block shear tests of each cross-sectional specimen shall comply with the followingrequirements with regard to the shear strength and the wood failure percentage.The shear strength of each glue line shall be at least 6,0 N/mm2. For Coniferous wood and Poplar a shear strength of4,0 N/mm2 shall be regarded as acceptable if the wood failure percentage is 100, see Table 2, individual values.The average wood failure percentage over a cross-sectional specimen and any individual value shall exceed theminimum wood failure percentages stated in Table 2.Table 2 - Minimum wood failure percentages, WFP, relating to the shear strength fv. For values in between,linear interpolation shall be usedAverageIndividual valuesShear strength fv in N/mm268fv 114
fv
66fv
10Minimum wood failure percentage, % 1)90724510074201)
For average values the minimum wood failure percentage is: 144 - (9 fv). For the individual values theminimum wood failure percentage for the shear strength fv
6,0 N/mm2 is: 153,3 - (13,3 fv).6 Manufacturing requirements6.1 Produc
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