Wood-based panels - Determination of characteristic 5-percentile values and characteristic mean values

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 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 distribution of the test data.
Test data should be determined from tests using the test methods outlined in EN 789.

Holzwerkstoffe - Bestimmung der charakteristischen 5-%-Quantilwerte und der charakteristischen Mittelwerte

Diese Europäische Norm legt ein Berechnungsverfahren auf der Grundlage von Prüfergebnissen von Holz-werkstoffen für tragende Zwecke fest zur Bestimmung von:
-   charakteristischen 5-%-Quantilwerten von mechanischen Eigenschaften unter Annahme einer log-normalen Verteilung der Prüfwerte nach EN 14358; und von
-   charakteristischen Mittelwerten (50-%-Quantilwerte) von physikalischen Eigenschaften unter Annahme einer Normalverteilung der Prüfwerte.
Die Prüfwerte sollten nach den in EN 789 angegebenen Prüfverfahren bestimmt werden.

Panneaux à base de bois - Détermination des valeurs caractéristiques correspondant au fractile à 5 % d'exclusion et des valeurs caractéristiques moyennes

Sur la base des résultats des essais des panneaux à base bois à but structurel, la présente Norme européenne spécifie une méthode pour la détermination :
-   des valeurs caractéristiques des propriétés mécaniques correspondant au fractile à 5 % d’exclusion, en supposant une distribution log-normale des données d’essai conformément à l’EN 14358 ; et
-   des valeurs caractéristiques moyennes des propriétés physiques (valeurs à 50 % d’exclusion) en supposant une distribution normale des données d’essai.
Il convient de déterminer les résultats d’essai à partir des essais utilisant les méthodes décrites dans l’EN 789

Lesne plošče - Ugotavljanje karakterističnih 5-percentilnih vrednosti in karakterističnih srednjih vrednosti

Na osnovi rezultatov preskusov lesnih plošč za konstrukcijske namene ta evropski standard opredeljuje metodo za določanje: značilnih 5-percentilnih vrednosti mehanskih lastnosti pod predpostavko log-normalne distribucije testnih podatkov v skladu z EN 14358; in značilnih srednjih vrednosti (50-percentilnih vrednosti) fizičnih lastnosti pod predpostavko normalne distribucije testnih podatkov. Testne podatke je potrebno določiti s pomočjo testov, z uporabo testnih metod, navedenih v EN 789.

General Information

Status
Published
Publication Date
10-Nov-2009
Current Stage
9092 - Decision on results of review/2YR ENQ - revise - Review Enquiry
Completion Date
28-May-2020

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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Holzwerkstoffe - Bestimmung der charakteristischen 5%-Quantilwerte und der charakteristischen MittelwertePanneaux à base de bois - Détermination des valeurs caractéristiques correspondant au fractile à 5 pour cent d'exclusion inférieure et des valeurs caractéristiques moyennesWood-based panels - Determination of characteristic 5-percentile values and characteristic mean values79.060.01Wood-based panels in generalICS:Ta slovenski standard je istoveten z:EN 1058:2009SIST EN 1058:2010en,fr,de01-april-2010SIST EN 1058:2010SLOVENSKI

STANDARDSIST EN 1058:19961DGRPHãþD
SIST EN 1058:2010
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE 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 à base de bois - Détermination des valeurs caractéristiques correspondant au fractile à 5 % d'exclusion et des valeurs caractéristiques 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 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 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 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, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR 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 1058:2009: ESIST EN 1058:2010

EN 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 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 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 variation .......................................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 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-percentile 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 %50EL parallel to the production line 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 50ρU of a normal distributed sample of particle boards with known coefficient of variation ρν. ................................................................................................................ 16Bibliography ..................................................................................................................................................... 17 SIST EN 1058:2010

EN 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 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 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 requirements 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 and 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 distributed 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 normal 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, 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 the United Kingdom. SIST EN 1058:2010

EN 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 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 distribution 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 references, 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 properties 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 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 percentile 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 SIST EN 1058:2010

EN 1058:2009 (E) 5 3.5 sample 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 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 xlnν Coefficient of variation of a log-normal distributed sample xν Coefficient of variation of a normal distributed 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 commercially and is capable of being identified at all stages of production, supply and in service. 6 Determination o

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