SIST EN 14251:2004

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Okrogli konstrukcijski les – Preskusne metodeRundholz für tragende Zwecke - PrüfverfahrenBois de structure rond - Méthodes d'essaiStructural round timber - Test methods91.080.20Lesene konstrukcijeTimber structures79.040Les, hlodovina in žagan lesWood, sawlogs and sawn timberICS:Ta slovenski standard je istoveten z:EN 14251:2003SIST EN 14251:2004en01-september-2004SIST EN 14251:2004SLOVENSKI
STANDARD



SIST EN 14251:2004



EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 14251December 2003ICS 79.040; 91.080.20English versionStructural round timber - Test methodsBois de structure rond - Méthodes d'essaiRundholz für bauliche Zwecke - PrüfverfahrenThis European Standard was approved by CEN on 1 September 2003.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 Central Secretariat 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 Central Secretariat has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and UnitedKingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2003 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 14251:2003: ESIST EN 14251:2004



EN 14251:2003 (E)2ContentspageForeword.31Scope.42Normative references.43Terms and definitions.44Symbols and abbreviations.55Determination of the moisture content of test pieces.56Determination of density of test pieces.67Determination of dimensions of test pieces.68Determination of the modulus of elasticity parallel to the grain.68.1Test procedure.68.2Expression of the results.79Determination of the bending strength parallel to the grain.89.1Test piece.89.2Test procedure.89.3Expression of the results.810Determination of the modulus of elasticity in compression parallel to the grain.810.1Test procedure.810.2Expression of the results.911Compressive strength parallel to the grain.1011.1General.1011.2Test procedure.1011.3Expression of the results.1012Test report.1012.1General.1012.2Test piece.1012.3Test method.1112.4Test results.11Bibliography.12SIST EN 14251:2004



EN 14251:2003 (E)3ForewordThis document (EN 14251:2003) has been prepared by Technical Committee CEN/TC 124, Timber Structures, thesecretariat of which is held by DS.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 June 2004, and conflicting national standards shall be withdrawn at the latest byJune 2004.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, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal,Slovakia, Spain, Sweden, Switzerland and the United Kingdom.SIST EN 14251:2004



EN 14251:2003 (E)41 ScopeThis standard applies for structural round wood timber other than specified in EN 12509.This test standard specifies test methods for determining the following properties of structural round timber; thebending strength, modulus of elasticity in bending; the compressive strength parallel to the grain and modulus ofelasticity in compression parallel to the grain.In addition, the determination of dimensions, moisture content and density is specified. The methods apply todebarked round timber.This standard is not intended for quality-control test purposes.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).Not applicable.3 Terms and definitionsFor the purposes of this European Standard, the following terms and definitions apply:3.1minimum diameterminimum diameter of the pole at the section of measurement3.2maximum diametermaximum diameter of the pole at the section of measurement3.3apparent diameterdiameter of a circle with the same circumference as the actual circumference at the section of measurement3.4nominal diametera) largest apparent diameter for poles with 5% or less ovalityb) largest minimum diameter for poles with more than 5% ovality3.5ovalitydifference between the maximum and minimum diameter at a cross section expressed as a percentage of theminimum diameter3.6sweepdeviation of the longitudinal axis from a straight lineSIST EN 14251:2004



EN 14251:2003 (E)53.7tapergradual change in diameter along the length4 Symbols and abbreviationsA cross-sectional area, in square millimetresa distance between loading position and nearest support in bending test, in millimetresdnom
nominal diameter of round timber beam at either end grain face, in millimetresdh diameter of round timber perpendicular to the direction of load at mid span, in millimetresdvdiameter of round timber in the direction of load at mid span, in millimetresEm,0 modulus of elasticity in bending, in Newton per square millimetreEc,0 modulus of elasticity in compression parallel to the grain, in Newton per square millimetreFload, in NewtonFmax maximum load, in Newtonfc,0 compressive strength parallel to the grain, in Newton per square millimetrefm,0 bending strength, in Newton per square millimetreh height of compression parallel to grain test piece, in millimetresh0gauge length of compression parallel to grain test piece, in millimetresI second moment of area, in millimetres to the fourth powerl
span in bending, in millimetresl1 gauge length for the determination of modulus of elasticity in bending, in millimetresw deflection or displacement in compression, in millimetres.5 Determination of the moisture content of test piecesThe tests shall be carried out on pieces which are conditioned at
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