BS EN 1058-2009 Wood-based panels - Determination of characteristic 5-percentile values and characteristic mean values《木基镶板 5%特征值和平均特征值的测定》.pdf

1、BS EN 1058:2009ICS 79.060.01NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDWood-based panels Determinationof characteristic 5-percentile values andcharacteristic meanvaluesLicensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 11/08/2010 03:05, Uncontrolled Cop

2、y, (c) BSIThis British Standardwas published under theauthority of the StandardsPolicy and StrategyCommittee on 31 May2010. BSI 2010ISBN 978 0 580 60357 0Amendments/corrigenda issued since publicationDate CommentsBS EN 1058:2009National forewordThis British Standard is the UK implementation of EN 10

3、58:2009. Itsupersedes BS EN 1058:1996 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee B/541, Wood based panels.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include

4、all the necessary provisionsof a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunityfrom legal obligations.Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 11/08/2010 03:05, Uncontrolled Copy, (c) BSIBS EN 1058:2009EUROPEAN STAN

5、DARD NORME EUROPENNE EUROPISCHE NORM EN 1058 November 2009 ICS 79.060.01 Supersedes EN 1058:1995English Version Wood-based panels - Determination of characteristic 5-percentile values and characteristic mean values Panneaux base de bois - Dtermination des valeurs caractristiques correspondant au fra

6、ctile 5 % dexclusion et des valeurs caractristiques moyennes Holzwerkstoffe - Bestimmung der charakteristischen 5-%-Quantil Werte und charakteristischen Mittelwerte This European Standard was approved by CEN on 3 October 2009. CEN members are bound to comply with the CEN/CENELEC Internal Regulations

7、 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 Management Centre or to any CEN member. This Europe

8、an 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 Management Centre has the same status as the official versions. CEN members are the nati

9、onal standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and

10、United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2009 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 1058:200

11、9: ELicensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 11/08/2010 03:05, Uncontrolled Copy, (c) BSIBS EN 1058:2009EN 1058:2009 (E) 2 Contents Page Foreword 31 Scope 42 Normative references 43 Terms and definitions .44 Symbols 55 Reference population 56 Determination of characteristic values of m

12、echanical and physical properties .56.1 Sampling .56.2 Testing 66.3 Analysis of data .66.3.1 General 66.3.2 Strength and stiffness properties 66.3.3 Characteristic mean value (50-percentile characteristic value) 67 Test report 6Annex A (informative) Calculation of the 5-percentile characteristic val

13、ue of log-normal distributed test data according to EN 14358 .7A.1 Symbols 7A.1.1 Letter symbols .7A.1.2 Indices .7A.2 Analysis of data .8A.2.1 Characteristic value km of test data with unknown coefficient of variation 8A.2.2 Characteristic value km of test data with known coefficient of variation .

14、8A.3 Acceptance criteria for a sample .9A.4 Examples of calculation 9A.4.1 Determination of the characteristic value of the modulus of bending 05f of particle boards with unknown coefficient of variation: .9A.4.2 Determination of the characteristic value of the modulus of bending 05f of particle boa

15、rds with known coefficient of variation: 11Annex B (normative) Calculation of the characteristic mean value (50-percentile value) of normal distributed test data 13B.1 Symbols . 13B.1.1 Letter symbols (see appendix A) 13B.1.2 Indices (see also appendix A) . 13B.2 Analysis of data 13B.2.1 50-percenti

16、le characteristic values (characteristic mean values) . 13B.3 Acceptance criteria for a sample 14B.4 Examples of calculation . 14B.4.1 Determination of the lower 50-percentile characteristic value (lower characteristic mean value) of the modulus of elasticity %50ELparallel to the production line of

17、OSB of a normal distributed sample with unknown coefficient of variation. . 14B.4.2 Determination of the upper 50-percentile characteristic value (upper characteristic mean value) of the density 50Uof a normal distributed sample of particle boards with known coefficient of variation . 16Bibliography

18、 . 17Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 11/08/2010 03:05, Uncontrolled Copy, (c) BSIBS EN 1058:2009EN 1058:2009 (E) 3 Foreword This document (EN 1058:2009) has been prepared by Technical Committee CEN/TC 112 “Wood-based panels”, the secretariat of which is held by DIN. This Europ

19、ean Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by May 2010, and conflicting national standards shall be withdrawn at the latest by May 2010. Attention is drawn to the possibility that some of the elements of

20、this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association, and supports essential r

21、equirements of EC Directive(s). This document supersedes EN 1058:1995, the statistical evaluation of which had to be corrected. The statistical evaluation follows the principles of Annex D of EN 1990:2002, of EN 1995-1-1:1993, Eurocode 5: Design of timber structures Part 1-1: General Common rules an

22、d rules for buildings, and of EN 14358:2006, Timber structures Calculation of characteristic 5-percentile values and acceptance criteria for a sample. Compared to EN 1058:1995 the following modifications have been made: a) For the determination of strength and stiffness properties for log-normal dis

23、tributed test data reference is made to EN 14358; b) The calculation of the 5-percentile characteristic value of log-normal distributed test data according to EN 14358 is described in Annex A and is explained by examples; c) The calculation of the characteristic mean value (50-percentile value) of n

24、ormal distributed test data is described in Annex B and is explained by examples. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denm

25、ark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 11/08/

26、2010 03:05, Uncontrolled Copy, (c) BSIBS EN 1058:2009EN 1058:2009 (E) 4 1 Scope On the basis of test results from wood-based panel products for structural purposes, this European Standard specifies a method for the determination of: characteristic 5-percentile values of mechanical properties under t

27、he assumption of a log-normal distribution of the test data according to EN 14358; and characteristic mean values (50-percentile values) of physical properties under the assumption of a normal distribution of the test data. Test data should be determined from tests using the test methods outlined in

28、 EN 789. 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 amendments) applies. EN 326-1, Wood-ba

29、sed panels Sampling, cutting and inspection Part 1: Sampling and cutting of test pieces and expression of test results EN 789, Timber structures Test methods Determination of mechanical properties of wood based panels EN 14358, Timber structures Calculation of characteristic 5-percentile values and

30、acceptance criteria for a sample 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 characteristic value value of a material property which is defined as a fractile of the distribution of that property within the total population of that materia

31、l NOTE For all strength properties, this fractile is the fifth percentile. For stiffness properties as well as physical properties, two different characteristic values can be used: the fifth percentile and the mean value. 3.2 panel piece of wood-based sheet material large enough to permit the cuttin

32、g of test pieces 3.3 reference population wood-based panels for which the characteristic values are relevant 3.4 production site any single production line Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 11/08/2010 03:05, Uncontrolled Copy, (c) BSIBS EN 1058:2009EN 1058:2009 (E) 5 3.5 sample

33、number of panels of one population NOTE Unless otherwise agreed, the panels of the sample are drawn at random. 3.6 shift continuous period of production by the same group of workers NOTE Normally 8 h. 3.7 test piece piece of panel cut to the size required for testing a specific property 4 Symbols L

34、Lower specification limit 05x Characteristic value of a log-normal distributed property 50x Characteristic mean value of a normal distributed property U Upper specification limit xln Coefficient of variation of a log-normal distributed sample x Coefficient of variation of a normal distributed sample

35、 5 Reference population The reference population is in accordance with EN 326-1 defined by parameters such as type and manufacturing process, thickness range, grade, lay-up and quality classification of wood-based panels and is consistent with the material that is or can be supplied commercially and

36、 is capable of being identified at all stages of production, supply and in service. 6 Determination of characteristic values of mechanical and physical properties 6.1 Sampling A total of at least 32 panels of the same type, grade, thickness range and/or lay-up shall be sampled at random from the pro

37、duction sites. Where there are fewer than 32 shifts, the total number of panels shall be obtained by taking a maximum of four panels from each shift at each production site. Sampling of test pieces from panels shall be in accordance with the procedures given in EN 789. Licensed Copy: Wang Bin, ISO/E

38、XCHANGE CHINA STANDARDS, 11/08/2010 03:05, Uncontrolled Copy, (c) BSIBS EN 1058:2009EN 1058:2009 (E) 6 6.2 Testing Testing shall be carried out in accordance with either EN 789 (for strength and stiffness properties) or EN 326-1 (for physical properties). 6.3 Analysis of data 6.3.1 General According

39、 to the distribution of the test data, the characteristic values shall be calculated either on the basis of log-normal distribution (in case of strength properties) or normal distribution (in case of physical properties and modulus of elasticity). If exceptionally, the number of panels is less than

40、32, the reasons for that have to be declared specifically in the test report. 6.3.2 Strength and stiffness properties The procedure of calculating the characteristic value 05x of log-normal distributed test data with known or unknown coefficient of variation xln according to EN 14358 is given in Ann

41、ex A. 6.3.3 Characteristic mean value (50-percentile characteristic value) The procedure of calculating the estimates of the characteristic mean value 50xLand 50xU, respectively, of normal distributed test data with known or unknown coefficient of variation x is given in Annex B. 7 Test report The t

42、est report shall contain the following statements: a) date and place of sampling; b) product type sampled; c) number of panels sampled and their dates of production; d) method of sampling and calculation; e) test results of 6.3.2 or 6.3.3, respectively. Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA ST

43、ANDARDS, 11/08/2010 03:05, Uncontrolled Copy, (c) BSIBS EN 1058:2009EN 1058:2009 (E) 7 Annex A (informative) Calculation of the 5-percentile characteristic value of log-normal distributed test data according to EN 14358 A.1 Symbols A.1.1 Letter symbols f Strength property, in newtons per square mill

44、imetre (N/mm) k Statistical factor )(nk Statistical factor for a population with known coefficient of variation L Lower specification limit km Characteristic value of log-normal distributed test data n Number of test results (panel means) of the sample xslnStandard deviation between panel means of a

45、 log-normal distributed property jx jx Panel mean x Grand mean A.1.2 Indices jTest panel serial number ( nj 1= ) kCharacteristic value of a log-normal distributed property LRelated to lower specification limit sIndex of the statistical factor for a population with unknown coefficient of variance xln

46、Related to log-normal distributed test data 055-percentile characteristic value of a log-normal distributed property Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 11/08/2010 03:05, Uncontrolled Copy, (c) BSIBS EN 1058:2009EN 1058:2009 (E) 8 A.2 Analysis of data A.2.1 Characteristic value km

47、 of test data with unknown coefficient of variation The characteristic value km of a log-normal distributed property is in accordance with EN 14358 defined as: =njjxsjkskxnxm1ln05)ln1exp( (A.1) where: 1lnlnln1)ln1(ln1112121ln=nnxxxnxnxsnjjnjjjnjjjjnjjnjjjjx(A.2) For sk values see Table A.1. Table A.

48、1 Factor sk values for test data, the coefficient of variation is unknown Number of test data n 5 10 15 20 30 32 40 50 100 sk value 2,46 2,10 1,99 1,93 1,87 1,86 1,83 1,81 1,75 A.2.2 Characteristic value km of test data with known coefficient of variation If the coefficient of variation xvlnis known

49、 from prior knowledge, e.g. from production control of a period of one year or more, the factor )(nk shall be taken as sk in Equation (A.1). If the known coefficient of variation xvlnis greater than 0,05, the standard deviation xslnshall be calculated according to Equation (A.3): )exp(ln)lnexp(ln)exp(lnlnlnlnlnlnlnlnxxxxxxxxsxxxsv= (A.3)For )(nk values see Table A.2. If the known coefficient of variation xvlnis smaller than 0,05, the sta