1、October 2012 Translation by DIN-Sprachendienst.English price group 17No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).IC
2、S 79.040; 79.060.99; 91.080.20!$.F“1921135www.din.deDDIN EN 408Timber structures Structural timber and glued laminated timber Determination of some physical and mechanical properties;English version EN 408:2010+A1:2012,English translation of DIN EN 408:2012-10Holzbauwerke Bauholz fr tragende Zwecke
3、und Brettschichtholz Bestimmung einiger physikalischer und mechanischer Eigenschaften;Englische Fassung EN 408:2010+A1:2012,Englische bersetzung von DIN EN 408:2012-10Structures en bois Bois de structure et bois lamell-coll Dtermination de certaines proprits physiques et mcaniques;Version anglaise E
4、N 408:2010+A1:2012,Traduction anglaise de DIN EN 408:2012-10SupersedesDIN EN 408:2010-12www.beuth.deDocument comprises 40 pagesIn case of doubt, the German-language original shall be considered authoritative.10.12 DIN EN 408:2012-10 2 A comma is used as the decimal marker. National foreword This sta
5、ndard has been prepared by Technical Committee CEN/TC 124 “Timber structures” (Secretariat: AFNOR, France). The responsible German body involved in its preparation was the Normenausschuss Bauwesen (Building and Civil Engineering Standards Committee), Working Committee NA 005-04-01 AA Holzbau (Sp CEN
6、/TC 124, CEN/TC 250/SC 5). Amendments This standard differs from DIN EN 408:2010-12 as follows: a) Amendment A1:2012 has been incorporated; b) normative references have been updated to include EN 384; c) Subclause 10.3 “Expression of results” has been revised and rendered more precise with regard to
7、 the shear modulus G; d) in Subclause 19.1 “Test piece”, a minimum length of 19 times the depth of the section has been specified; e) in Subclause 19.2 “Procedure”, a span of 18 times the depth has been specified and the time to reach maximum load has been modified. Previous editions DIN EN 1193: 19
8、98-06 DIN EN 408: 1996-04, 2004-08, 2010-12 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 408:2010+A1 July 2012 ICS 91.080.20; 79.040; 79.060.99 English Version Timber structures Structural timber and glued laminated timber Determination of some physical and mechanical properties Structures e
9、n bois Bois de structure et bois lamell-coll Dtermination de certaines proprits physiques et mcaniques Holzbauwerke Bauholz fr tragende Zwecke und Brettschichtholz Bestimmung einiger physikalischer und mechanischer Eigenschaften This European Standard was approved by CEN on 16 June 2012. CEN members
10、 are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application
11、to the CEN-CENELEC 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 translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
12、 Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lit
13、huania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Bruss
14、els 2012 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 408:2010+A1:2012: E EN 408:2010+A1:2012 (E) 2 Contents Page Foreword 4Introduction .51 Scope 62 Normative references 63 Terms and definitions .64 Symbols and abbreviations 65
15、 Determination of dimensions of test pieces .86 Determination of moisture content of test pieces 87 Determination of density of test pieces 88 Conditioning of test pieces .89 Determination of local modulus of elasticity in bending .99.1 Test piece .99.2 Procedure .99.3 Expression of results . 1010 D
16、etermination of global modulus of elasticity in bending . 1110.1 Test piece 1110.2 Procedure 1110.3 Expression of results . 1211 Determination of the shear modulus 1311.1 Torsion method . 1311.1.1 Test piece 1311.1.2 Procedure 1311.1.3 Expression of results . 1611.2 Shear field test method 1711.2.1
17、Test piece 1711.2.2 Procedure 1711.2.3 Expression of results . 1912 Determination of modulus of elasticity in tension parallel to the grain 1912.1 Test piece 1912.2 Procedure 1912.3 Expression of results . 2013 Determination of tension strength parallel to the grain 2013.1 Test piece 2013.2 Procedur
18、e 2113.3 Expression of results . 2114 Determination of modulus of elasticity in compression parallel to the grain 2114.1 Test piece 2114.2 Procedure 2214.3 Expression of results . 2215 Determination of compression strength parallel to grain 2215.1 Test piece 2215.2 Procedure 2215.3 Expression of res
19、ults . 2316 Determination of tension and compression strengths perpendicular to the grain . 2316.1 Requirements for test pieces 23DIN EN 408:2012-10EN 408:2010+A1:2012 (E) 3 16.1.1 Fabrication . 2316.1.2 Surface preparation . 2316.2 Procedure . 2416.3 Expression of results 2716.3.1 Compression perpe
20、ndicular to the grain 2716.3.2 Tension perpendicular to the grain . 2717 Determination of modulus of elasticity perpendicular to the grain . 2717.1 Requirements for test pieces . 2717.2 Procedure . 2717.3 Expression of results 2817.3.1 Compression perpendicular to the grain 2817.3.2 Tension perpendi
21、cular to the grain . 2818 Determination of shear strength parallel to the grain . 2918.1 Requirements for test pieces . 2918.1.1 Fabrication . 2918.1.2 Surface preparation . 2918.2 Procedure . 3018.3 Expression of results 3119 Bending strength parallel to grain . 3219.1 Test piece . 3219.2 Procedure
22、 . 3219.3 Expression of results 3320 Test report 3420.1 General . 3420.2 Test piece . 3420.3 Test method . 3420.4 Test results 34Annex A (informative) Example of compression perpendicular to grain test arrangement 35Annex B (informative) Example of tension perpendicular to grain test arrangement wit
23、h rigid fixings . 37Bibliography 38DIN EN 408:2012-10EN 408:2010+A1:2012 (E) 4 Foreword This document (EN 408:2010+A1:2012) has been prepared by Technical Committee CEN/TC 124 “Timber structures”, the secretariat of which is held by AFNOR. This European Standard shall be given the status of a nation
24、al standard, either by publication of an identical text or by endorsement, at the latest by January 2013, and conflicting national standards shall be withdrawn at the latest by January 2013. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
25、 rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document includes Amendment 1 approved by CEN on 16 June 2012. The start and finish of text introduced or altered by amendment is indicated in the text by tags !“. This document supersedes !
26、EN 408:2010.“ In this revised standard a new test is added for the determination of the shear modulus. According to the CEN/CENELEC Internal Regulations, the national standards organisations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia
27、, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the
28、United Kingdom. DIN EN 408:2012-10EN 408:2010+A1:2012 (E) 5 Introduction This 2010 revision replaces the test for the determination of the shear strength parallel to grain. The revised edition of 2003 added a global bending modulus of elasticity, whilst renaming the existing test as the local modulu
29、s of elasticity. It also includes the methods for determination of shear strength and mechanical properties perpendicular to the grain, previously given in EN 1193, which has now been withdrawn. The values obtained in any determination of the properties of timber depend upon the test methods used. I
30、t is therefore desirable that these methods be standardized so that results from different test centres can be correlated. Moreover, with the adoption of limit state design and with the development of both visual and machine stress grading, attention will be increasingly centred on the determination
31、 and monitoring of the strength properties and variability of timber in structural sizes. Again, this can be more effectively undertaken if the basic data are defined and obtained under the same conditions. This European Standard, which is based originally on ISO 8375, specifies laboratory methods f
32、or the determination of some physical and mechanical properties of timber in structural sizes. The methods are not intended for the grading of timber or for quality control. For the determination of shear modulus, alternative methods have been specified. The choice of which to use will depend upon t
33、he objective of the investigation and, to some extent, on the equipment available. Following testing to this standard it is intended that the determination of characteristic values will normally be obtained according to procedures specified in other European Standards. Attention is drawn to the adva
34、ntages that may be gained, often with little extra effort, in extending the usefulness of test results by recording additional information on the growth characteristics of the pieces that are tested, particularly at the fracture sections. Generally, such additional information should include grade-d
35、etermining features such as knots, slope of grain, rate of growth, wane, etc., on which visual grading rules are based, and strength indicating parameters such as localized modulus of elasticity, on which some machine stress grading is based. DIN EN 408:2012-10EN 408:2010+A1:2012 (E) 6 1 Scope This
36、European Standard specifies test methods for determining the following properties of structural timber and glued laminated timber: modulus of elasticity in bending; shear modulus; bending strength; modulus of elasticity in tension parallel to the grain; tension strength parallel to the grain; modulu
37、s of elasticity in compression parallel to the grain; compression strength parallel to the grain; modulus of elasticity in tension perpendicular to the grain; tension strength perpendicular to the grain; modulus of elasticity in compression perpendicular to the grain; compression strength perpendicu
38、lar to the grain and shear strength. In addition, the determination of dimensions, moisture content, and density of test pieces are specified. The methods apply to rectangular and circular shapes (of substantially constant cross section) of solid unjointed timber or finger-jointed timber and glued l
39、aminated timber unless stated otherwise. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendm
40、ents) applies. !EN 384:2010, Structural timber Determination of characteristic values of mechanical properties and density“ EN 13183-1, Moisture content of a piece of sawn timber Part 1 : Determination by oven dry method 3 Terms and definitions Not applicable. 4 Symbols and abbreviations A cross-sec
41、tional area, in square millimetres; a distance between a loading position and the nearest support in a bending test, in millimetres; b width of cross section in a bending test, or the smaller dimension of the cross section, in millimetres; Ec,0modulus of elasticity in compression parallel to the gra
42、in, in newtons per square millimetre; Ec,90 modulus of elasticity in compression perpendicular to the grain, in newtons per square millimetre; Em,gglobal modulus of elasticity in bending, in newtons per square millimetre; Em,llocal modulus of elasticity in bending, in newtons per square millimetre;
43、Et,0modulus of elasticity in tension parallel to the grain, in newtons per square millimetre; Et,90 modulus of elasticity in tension perpendicular to the grain, in newtons per square millimetre; F load, in newtons; Fc,90 compressive load perpendicular to the grain, in newtons; Fc,90,max maximum comp
44、ressive load perpendicular to the grain, in newtons; Fc,90,max,est estimated maximum compressive load perpendicular to the grain, in newtons; DIN EN 408:2012-10EN 408:2010+A1:2012 (E) 7 Fmaxmaximum load, in newtons; Fmax,estestimated maximum load, in newtons; Ft,90 tensile load perpendicular to the
45、grain, in newtons; Ft,90,max maximum tensile load perpendicular to the grain, in newtons; G shear modulus, in newtons per square millimetre; S first moment of area, in millimetres to the third power; fc,0compressive strength parallel to the grain, in newtons per square millimetre; fc,90 compressive
46、strength perpendicular to the grain, in newtons per square millimetre; fmbending strength, in newtons per square millimetre; ft,0tensile strength parallel to the grain, in newtons per square millimetre; ft,90 tensile strength perpendicular to the grain, in newtons per square millimetre; fv shear str
47、ength parallel to the grain, in newtons per square millimetre; fv,kcharacteristic shear strength parallel to the grain, in newtons per square millimetre; G shear modulus, in newtons per square millimetre; Gtor,tshear modulus in torsion, in newtons per square millimetre; Gtor,s shear modulus in shear
48、 field, in newtons per square millimetre; h depth of cross section in a bending test, or the larger dimension of the cross section, or the test piece height in perpendicular to grain and shear tests, in millimetres; h0 gauge length, in millimetres; I second moment of area, in millimetres to the fourth power; K, k coefficients; kGcoefficient for shear modulus
