EN 1058-2009 en Wood-based panels - Determination of characteristic 5-percentile values and characteristic mean values《木基板材 特征5-百分位数值和特征均值的测定》.pdf

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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 meanvaluesThis British Standardwas published under theauthority of the StandardsPolicy and Strategy

2、Committee 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 1058:2009. Itsupersedes BS EN 1058:1996 which is withdrawn.The UK participation in its preparation wa

3、s 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 all the necessary provisionsof a contract. Users are responsible for its correct application.Compli

4、ance with a British Standard cannot confer immunityfrom legal obligations.BS EN 1058:2009EUROPEAN STANDARD 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 characteri

5、stic mean values Panneaux base de bois - Dtermination des valeurs caractristiques correspondant au fractile 5 % dexclusion et des valeurs caractristiques moyennes Holzwerkstoffe - Bestimmung der charakteristischen 5-%-Quantil Werte und charakteristischen Mittelwerte This European Standard was approv

6、ed by CEN on 3 October 2009. CEN members 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 s

7、tandards may be obtained on application to the CEN 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 notifi

8、ed to the CEN Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malt

9、a, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and 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 explo

10、itation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 1058:2009: EBS 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 o

11、f mechanical 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

12、value 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 variatio

13、n .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

14、boards 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-perce

15、ntile 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

16、of 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 . 16Bibliogra

17、phy . 17BS 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 European Standard shall be given the status of a national standard, either by publication of an ident

18、ical 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 this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsi

19、ble 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 requirements of EC Directive(s). This document supersedes EN 1058:1995, the statistical evaluatio

20、n 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 and rules for buildings, and of EN 14358:2006, Timber structures Calculation of characteristic 5-p

21、ercentile 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 distributed test data reference is made to EN 14358; b) The calculation of the 5-percentile charact

22、eristic 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 normal distributed test data is described in Annex B and is explained by examples. According to t

23、he 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, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithua

24、nia, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. BS 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 specifi

25、es a method for the determination of: characteristic 5-percentile values of mechanical properties under the 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 di

26、stribution of the test data. Test data should be determined from tests using the test methods outlined in 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 refere

27、nces, the latest edition of the referenced document (including any amendments) applies. EN 326-1, Wood-based 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 propertie

28、s of wood based panels EN 14358, Timber structures Calculation of characteristic 5-percentile values and 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

29、is defined as a fractile of the distribution of that property within the total population of that material 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 perc

30、entile and the mean value. 3.2 panel piece of wood-based sheet material large enough to permit the cutting 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 BS EN 1058:2009EN 1058:2009 (E) 5 3.5 s

31、ample 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 Symb

32、ols L 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

33、sample 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 commercial

34、ly and 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 t

35、he production 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. BS EN 1058:2009EN 1058:2

36、009 (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 to the distribution of the test data, the characteristic values shall be calculated either o

37、n 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 32, the reasons for that have to be declared specifically in the test report. 6.3.2 Strength

38、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 Annex A. 6.3.3 Characteristic mean value (50-percentile characteristic value) The procedure of c

39、alculating 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 test report shall contain the following statements: a) date and place of sampling; b) product

40、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. BS EN 1058:2009EN 1058:2009 (E) 7 Annex A (informative) Calculation of the 5-percentile characteristic value of log-normal distributed test

41、 data according to EN 14358 A.1 Symbols A.1.1 Letter symbols f Strength property, in newtons per square millimetre (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 te

42、st data n Number of test results (panel means) of the sample xslnStandard deviation between panel means of a 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 sp

43、ecification limit sIndex of the statistical factor for a population with unknown coefficient of variance xlnRelated to log-normal distributed test data 055-percentile characteristic value of a log-normal distributed property BS EN 1058:2009EN 1058:2009 (E) 8 A.2 Analysis of data A.2.1 Characteristic

44、 value km 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.

45、 Table A.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 xvl

46、nis known 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)ln

47、exp(ln)exp(lnlnlnlnlnlnlnlnxxxxxxxxsxxxsv= (A.3)For )(nk values see Table A.2. If the known coefficient of variation xvlnis smaller than 0,05, the standard deviation xslnshall be xxln05,0 . Table A.2 Factor )(nk values for test data, the coefficient of variation is unknown Number of test data n 5 10

48、 15 20 30 32 40 50 100 )(nk value 1,95 1,86 1,82 1,80 1,77 1,76 1,75 1,74 1,69 BS EN 1058:2009EN 1058:2009 (E) 9 A.3 Acceptance criteria for a sample If the characteristic value of a property05x , calculated according to Equation (A.1), is equal or greater than the lower specification limit L given

49、in the respective performance standard, the requirements are fulfilled. A.4 Examples of calculation A.4.1 Determination of the characteristic value of the modulus of bending 05fof particle boards with unknown coefficient of variation Number of test results: 32=n Coefficient of variation: unknownx:ln Lower specification limit: 2mmN14=L Assumed test data are given in Table A.3. BS EN 1058:2009EN 1058:2009 (E) 10 Table A.3 Tabulate