1、BSI Standards PublicationBS EN 1912:2012Structural Timber Strength classes Assignment of visual grades and speciesIncorporating corrigendum August 2013BS EN 1912:2012National forewordThis British Standard is the UK implementation of EN 1912:2012, incorporating corrigendum August 2013. It supersedes
2、BS EN 1912:2004+A4:2010 which is withdrawn.The start and finish of text introduced or altered by corrigendum is indicated in the text by tags. Text altered by CEN corrigendum August 2013 is indicated in the text by .The UK participation in its preparation was entrusted to Technical Committee B/518,
3、Structural timber.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2013. Publis
4、hed by BSI Standards Limited 2013ISBN 978 0 580 84267 2ICS 79.040Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 August 2012.Amendments/corrigenda issued since
5、 publicationDate Text affected30 September 2013 Implementation of CEN corrigendum August 2013BRITISH STANDARDEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 1912 April 2012 ICS 79.040 English Version Structural Timber - Strength classes - Assignment of visual grades and species Bois de structur
6、e - Classes de rsistance - Affectation des classes visuelles et des essences Bauholz fr tragende Zwecke - Festigkeitsklassen - Zuordnung von visuellen Sortierklassen und Holzarten This European Standard was approved by CEN on 9 March 2012. CEN members are bound to comply with the CEN/CENELEC Interna
7、l 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 to the CEN-CENELEC Management Centre or to any CE
8、N 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 Centre has the same status as the official versi
9、ons. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slo
10、venia, 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 Brussels 2012 CEN All rights of exploitation in any form and by any means reserved worldwide
11、for CEN national Members. Ref. No. EN 1912:2012: EIncorporating corrigendum August 2013BS EN 1912:2012EN 1912:2012 (E) 2 Contents Page Foreword 31 Scope 42 Normative references 43 Terms and definitions .44 Symbols and abbreviations 45 Requirements .56 Assignments to strength classes 5Annex A (inform
12、ative) Grading standards . 15Bibliography . 17BS EN 1912:2012EN 1912:2012 (E) 3 Foreword This document (EN 1912:2012) 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 national sta
13、ndard, either by publication of an identical text or by endorsement, at the latest by October 2012, and conflicting national standards shall be withdrawn at the latest by October 2012. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent right
14、s. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 1912:2004+A4:2010. This revised version contains assignments of additional grades and species. According to the CEN/CENELEC Internal Regulations, the national standards orga
15、nizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Po
16、rtugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. BS EN 1912:2012EN 1912:2012 (E) 4 1 Scope This European Standard lists the visual strength grades, species and sources of timber, and specifies the strength classes to which they are assigned, as document
17、ed in EN 338. NOTE For the grades, species and sources included, there is a long history of use and/or satisfactory test data. The sources listed therefore are largely determined by existing commercial practice. 2 Normative references The following documents, in whole or in part, are normatively ref
18、erenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 384, Structural timber Determination of characteristic values of mech
19、anical properties and density EN 14081-1, Timber structures Strength graded structural timber with rectangular cross section Part 1: General requirements EN 14081-2, Timber structures Strength graded structural timber with rectangular cross section Part 2: Machine grading; additional requirements fo
20、r initial type testing EN 14081-3, Timber structures Strength graded structural timber with rectangular cross section Part 3: Machine grading; additional requirements for factory production control EN 14081-4, Timber structures Strength graded structural timber with rectangular cross section Part 4:
21、 Machine grading; grading machine settings for machine controlled systems 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 timber source geographical area of growth of the trees from which the timber is sawn 3.2 timber species individual speci
22、es or combination of species 3.3 Nordic countries Denmark, Finland, Iceland, Norway and Sweden 4 Symbols and abbreviations CNE Europe Central, Northern and Eastern Europe NNE Europe Northern and North Eastern Europe NC Europe Northern and Central Europe BS EN 1912:2012EN 1912:2012 (E) 5 5 Requiremen
23、ts 5.1 The grades referred to in Tables 1 and 2 shall be in accordance with a grading standard that meets the requirements of EN 14081. 5.2 Timber of a grade, species and source may be assigned to a strength class and listed in this document, provided there is a long history of use and/or test data
24、in accordance with EN 384. NOTE 1 Where the required information becomes available for a grade, species and source not included in this document, preliminary assignment to a strength class, pending revision of this document, may be obtained from CEN/TC 124. NOTE 2 The assignments of grades, species
25、and sources to strength classes given in this document should be reassessed when this document is reviewed, or sooner if there is reason to suspect that the mechanical properties and/or density of the timber have changed, or the basis for the existing assessment no longer represents the current situ
26、ation (e.g. if there has been a change in the source). 6 Assignments to strength classes The timber grades, species and sources listed meet the requirements of the strength classes to which they are assigned in Table 1 and Table 2. Table 3 and Table 4 identify the botanical species for the commercia
27、l names listed in Table 1 and Table 2. NOTE 1 Timber graded by machine to EN 14081 may be graded directly to the strength classes and marked accordingly, and is therefore not referenced in this document. NOTE 2 For combinations of species and visual grades which meet the requirements of EN 14081 but
28、 are not listed in this standard, the assignment to strength classes can be made according to EN 338 using characteristic values determined in accordance with EN 384. The accepted assignments to strength classes given in this European Standard are based on initial type testing (ITT) and initial type
29、 calculation (ITC). The ITT and ITC documentation from the manufacturers has been evaluated by CEN/TC124/WG2/TG1 and the accepted values given in an ITT report. This report is the basis for the attestation of conformity by the Notified Body conducting the certification of the producers factory produ
30、ction control (FPC). Further ITT reports may be used as documentation before the information they contain becomes available in an amendment or revision of this European Standard, EN 1912. BS EN 1912:2012EN 1912:2012 (E) 6 Table 1 Assignment of grades of conifer and poplar species to strength classes
31、 Strength Class Grading rule publishing country Grade (see Note 2) Species commercial name Source Botanical identification (see Table 3) Comments C35 Germany Erythrophleum suaveolens Brenan Entandrophragma cylindricum Eucalyptus diversicolor Eucalyptus marginata Eucalyptus globulus Intsia bijuga Int
32、sia palembanica Koompassia malaccensis Lophira alata Manikara bidentata Milicia excelsa Milicia regia Nauclea diderrichii Newtonia suaveolens Brenan Ocotea rodiaei Shorea glauca Shorea maxwelliana Tectona grandis Tabebuia Spp Fagus sylvatica Quercus petraea Quercus robur Quercus alba Quercus rubra Q
33、ualea Spp: Ruizterania spp Fraxinus americana Fraxinus excelsior 75 79 141 134 135 137 80 86 139 140 132 90 91 92 94 95 98 100 133 103 104 107 ( Alimiao ) 110 113 114 117 136 119 122 123 124 125 138 130 131 BS EN 1912:2012EN 1912:2012 (E) 15 Annex A (informative) Grading standards The requirements f
34、or the grades listed in Table 1 and Table 2 are given in the standards listed in Table A.1. Table A.1 Grading standards Grading rule publishing country Grade Grading standardAustria S13, S13K S10, S10K S7, S7K Austrian Standard OENORM DIN 40741:2012 (sortiert als Kantholz) (graded as joist) Sortieru
35、ng von Holz nach der Tragfhigkeit,-Teil 1: Nadelschnittholz Canada J Classement visuel pour emploi en structure pour les principales essences rsineuses et feuillues Germany German Standard DIN 4074 Teil 1 (sortiert als Kantholz) (graded as joist) Sortierung von Holz nach der Tragfhigkeit,- Teil 1: N
36、adelschnittholz, 2012 German Standard DIN 4074 Teil 5 (sortiert als Kantholz) (graded as joist) Sortierung von Holz nach der Tragfhigkeit - Teil 5: Laubschnittholz, 2003 Ireland SS GS Irish Standard IS 127:2002 Specification for the stress grading of softwood timber Italy S1 S2 S3 S Italian Standard
37、 UNI 11035-1/-2:2010 Legno strutturale Classificazione a vista di legnami italiani secondo la resistenza meccanica Structural timber - Visual strength grading for structural timbers Netherlands C3 STH T3, T2 T1, T0 Netherlands Standard NEN 5493:2010 Quality requirements for hardwoods in civil engine
38、ering works and other structural applications NEN 5499:2007 “Requirements for visually graded softwood for structural applications ST-I ST-II ST-III ST IV HSST1 S13, S13K S10, S10K S7, S7K LS13, LS13K LS10 and better, LS10K and betterBS EN 1912:2012EN 1912:2012 (E) 16 Nordic countries T3 T2 T1 T0 No
39、rdic grading rules INSTA 142:2009 Nordic visual strength grading rules for timber Portugal E Portuguese Standard NP 4305:1995 Madeira serrada de pinheiro bravo para estruturas Spain ME1 ME2 MEG MEF Spanish Standard UNE 56.544:2009 Clasificacin visual de la Madera aserrada para uso structural Spanish
40、 standard UNE 56-546:2007 Visual grading for structural timber : Hardwood species Slovak Republic S0 SI SII Slovak Standard STN 49 1531:2001 Drevo na stavebn nosn kontrukcie Vizulne triedenie poda pevnosti Slovenia S10 S7 Razvrscanje lesa po trdnosti -1 del Zagani les iglavcev SIST DIN 4074-1:2009 (
41、Razvrscanje kot trami) (Graded as a joist) UK SS GS HS TH1 British Standard BS 4978:2007+A1:2011 Visual strength grading of softwood British Standard BS 5756:2007+A1:2011 Visual strength grading of hardwood BS EN 1912:2012EN 1912:2012 (E) 17 Bibliography 1 EN 338, Structural timber Strength classes
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