1、September 2011 Translation by DIN-Sprachendienst.English price group 11No 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).
2、ICS 79.060.10!$tGc“1813664www.din.deDDIN EN 12369-2Wood-based panels Characteristic values for structural design Part 2: PlywoodEnglish translation of DIN EN 12369-2:2011-09Holzwerkstoffe Charakteristische Werte fr die Berechnung und Bemessung von Holzbauwerken Teil 2: SperrholzEnglische bersetzung
3、von DIN EN 12369-2:2011-09Panneaux base de bois Valeurs caractristiques pour la conception des structures Partie 2: ContreplaquTraduction anglaise de DIN EN 12369-2:2011-09SupersedesDIN EN 12369-2:2004-05www.beuth.deIn case of doubt, the German-language original shall be considered authoritative.Doc
4、ument comprises pages08.1119DIN EN 12369-2:2011-09 A comma is used as the decimal marker. National foreword This standard has been prepared by Technical Committee CEN/TC 112 “Wood-based panels” (Secretariat: DIN, Germany). The responsible German body involved in its preparation was the Normenausschu
5、ss Holzwirtschaft und Mbel (Timber and Furniture Standards Committee), Working Committee 042-02-15 AA Holzwerkstoffe Spiegelausschuss zu CEN/TC 112 und ISO/TC 89. The DIN Standard corresponding to the International Standard referred to in this document is as follows: ISO 3131 DIN 52182 Amendments Th
6、is standard differs from DIN EN 12369-2:2004-05 as follows: a) the scope has been limited; b) where no values were available, this document provides, for tension and compression, strength and stiffness values derived from bending classes in each direction and taking the surface appearance class into
7、 account; c) this document gives more relevant values for shear properties in relation to the density of the wood species in the panel; d) the range of density, from 350 kg/m3to 750 kg/m3, corresponds to data used to determine the correlation between these shear properties and density; e) the charac
8、teristic value of the density is determined by using the results of Factory Production Control (FPC). Previous editions DIN EN 12369-2: 2004-05 National Annex NA (informative) Bibliography DIN 52182, Testing of wood Determination of density 2 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 1236
9、9-2 June 2011 ICS 79.060.10 Supersedes EN 12369-2:2004English Version Wood-based panels - Characteristic values for structural design - Part 2: Plywood Panneaux base de bois - Valeurs caractristiques pour la conception des structures - Partie 2: Contreplaqu Holzwerkstoffe - Charakteristische Werte f
10、r die Berechnung und Bemessung von Holzbauwerken - Teil 2: Sperrholz This European Standard was approved by CEN on 11 May 2011. 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
11、 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 CEN member. This European Standard exists in three official versions (English, French, German). A version in any o
12、ther 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 versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republi
13、c, 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 COMIT EUROPEN DE NO
14、RMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2011 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12369-2:2011: EEN 12369-2:2011 (E) 2 Contents Page Foreword 31 Scope 42 Normative
15、references 43 Terms and definitions .54 Symbols 64.1 Main symbols .64.2 Subscripts 65 General 76 Characteristic values for plywood .76.1 Introduction 76.2 Bending, tension and compression .86.2.1 General 86.2.2 Strength 86.2.3 Modulus of elasticity 106.3 Shear properties . 106.4 Characteristic densi
16、ty 11Annex A (informative) Format for the presentation of characteristic values . 12Annex B (informative) Information about the conversion factors . 14B.1 Tension Compression . 14B.1.1 General . 14B.1.2 Strength . 14B.1.3 Modulus of elasticity 14B.2 Shear properties . 15Bibliography . 17DIN EN 12369
17、-2:2011-09 EN 12369-2:2011 (E) 3 Foreword This document (EN 12369-2:2011) 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 t
18、ext or by endorsement, at the latest by December 2011, and conflicting national standards shall be withdrawn at the latest by December 2011. 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 resp
19、onsible for identifying any or all such patent rights. This document supersedes EN 12369-2:2004. This standard is intended to be used in conjunction with EN 1995-1-1:2004. Compared to EN 12369-2:2004, the following changes have been made: a) The scope has been limited; b) Where no values were availa
20、ble, this document provides, for tension and compression, strength and stiffness values derived from bending classes in each direction and taking the surface appearance class into account; c) This document gives more relevant values for shear properties in relation to the density of the wood species
21、 in the panel; d) The range of density, from 350 kg/m3to 750 kg/m3, corresponds to data used to determine the correlation between these shear properties and density; e) The characteristic value of the density is determined by using the results of Factory Production Control (FPC). This European Stand
22、ard is one of a series specifying characteristic values of wood-based panels for structural design. The other parts of this series are listed in the Bibliography. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement
23、 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, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzer
24、land and the United Kingdom. DIN EN 12369-2:2011-09 EN 12369-2:2011 (E) 4 1 Scope This European Standard provides information on the characteristic values for use in designing structures incorporating wood-based panels. The characteristic values given in this standard are to be used in accordance wi
25、th EN 1995-1-1. When utilizing the classification system for derivation of plywood characteristic values, this European Standard can only be applied with reference to EN 636. This European Standard includes the characteristic values of the mechanical properties for plywood complying with EN 636 in b
26、ending, tension, compression, panel shear and planar shear. EN 636 classifies bending properties into two sets of classes, one for stiffness and another for strength. Stiffness and strength in tension and compression are related to the same properties in bending. For shear properties, fixed values d
27、etermined by correlation to density are provided. Where optimised values are needed, the characteristic values are determined directly by testing in accordance with EN 789 and EN 1058 or by combination of testing according to the latter two standards and calculation according to prEN 14272. This Eur
28、opean Standard applies to panels complying with the three following conditions: 5 layers or more and 6 mm overall thickness and more; the ratio of the cumulative thickness of veneers in alternate directions does not exceed 2,5; wood species with a mean density greater than 350 kg/m3and not exceeding
29、 750 kg/m3. 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 310, Wood-b
30、ased panels Determination of modulus of elasticity in bending and of bending strength EN 323, Wood-based panels Determination of density EN 326-2, Wood-based panels Sampling, cutting and inspection Part 2: Initial type testing and factory production control EN 635-2, Plywood Classification by surfac
31、e appearance Part 2: Hardwood EN 635-3, Plywood Classification by surface appearance Part 3: Softwood EN 636:2003, Plywood Specifications EN 1995-1-1:2004, Eurocode 5: Design of timber structures Part 1-1: General Common rules and rules for buildings ISO 3131, Wood Determination of density for physi
32、cal and mechanical tests DIN EN 12369-2:2011-09 EN 12369-2:2011 (E) 5 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 relating to limit state design, for use in the design of timber structures
33、, elements, assemblies and component in accordance with EN 1995-1-1 NOTE 1 As defined in EN 1995-1-1, this value corresponds to a specified percentile of the assumed distribution of the property under consideration. NOTE 2 For plywood determined as stipulated in this document. 3.2 service class NOTE
34、 Three service classes are defined in EN 1995-1-1. 3.2.1 service class 1 conditions of exposure resulting in moisture content in the materials corresponding to a temperature of 20 C and the relative humidity of the surrounding air exceeding 65 % for only a few weeks per year NOTE In these conditions
35、 the moisture content of coniferous plywood can be expected not to exceed 12 %. 3.2.2 service class 2 conditions of exposure resulting in moisture content in the materials corresponding to a temperature of 20 C and the relative humidity of the surrounding air exceeding 85 % for only a few weeks per
36、year NOTE In these conditions the moisture content of coniferous plywood can be expected not to exceed 18 %. 3.2.3 service class 3 conditions of exposure resulting in higher moisture content in the materials than in service class 2 NOTE In these conditions the moisture content of coniferous plywood
37、can be expected to exceed 18 %. 3.3 load duration class class characterized by the effect of a constant load acting for a certain period of time in the life of the structure NOTE 1 For a variable action, the appropriate class is determined on the basis of an estimate of the interaction between the t
38、ypical variation of the load with time and the rheological properties of the materials. NOTE 2 For strength and stiffness calculations, actions are assigned to one of the load-duration classes given in Table 1, derived from EN 1995-1-1. DIN EN 12369-2:2011-09 EN 12369-2:2011 (E) 6 Table 1 Load durat
39、ion classes Load duration class Order of accumulated duration of characteristic load Examples of loading Permanent More than 10 years Self weight Long-term 6 months to 10 years Storage Medium-term 1 week to 6 months Imposed load Short-term Less than 1 week Snow a and wind Instantaneous Accidental lo
40、ad aIn areas which have a heavy snow load for a prolonged period of time, part of the load should be regarded as medium-term 3.4 lay-up thickness and arrangement of the plies 3.5 composition factors compounding the lay-up plus the combination of wood species 4 Symbols 4.1 Main symbols E Modulus of e
41、lasticity (defined as stiffness in EN 1995-1-1:2004), (N/mm2) f Strength (N/mm2) G Modulus of rigidity (N/mm2) k Retention factor in strength (kmod) or stiffness (kdef) after a period of time relative to initial values. Values are included in EN 1995-1-1 Density of a wood species or of plywood (kg/m
42、3) 0 In the direction of the grain of the outer layer of plywood 90 Perpendicular to the grain of the outer layer of plywood 4.2 Subscripts c Compression k or 05 Characteristic (5thpercentile) m Bending r Planar shear t Tension DIN EN 12369-2:2011-09 EN 12369-2:2011 (E) 7 v Panel shear w Wood specie
43、s p Panel mean or 50 Mean (50thpercentile) mod related to modification factor for strength def related to modification factor for deflection 5 General In this standard the 5thpercentile defines the characteristic value for: strength; density; modulus of elasticity where buckling, as an example, may
44、be expected in service. Otherwise the 50thpercentile defines the characteristic value of the modulus of elasticity. The characteristic value is derived in panels with moisture content as determined by a temperature of 20 C and a relative humidity of 65 %. The characteristic value of a property is to
45、 be used in design according to EN 1995-1-1. Where panels are structurally used under service class 1, 2 and 3 conditions, performance values inferred by the classification and listed in Table 2 and 3 shall be modified according to the service class and the duration of load (kmod, kdef). Manufacture
46、rs utilising the EN 636 classification system for determination of characteristic values may present these values in a format similar to that in Annex A. The characteristic values shall be supported by the following information: product description; product specifications; service class or classes i
47、n which the panel can be used; details of the veneer species and grade, and of the composition; density of the panel. 6 Characteristic values for plywood 6.1 Introduction Characteristic values for plywood can be determined by one of two distinct methods as described in Clause 1. The following tables
48、 in this clause provide the characteristic values for plywood based on the EN 636 Classification System. DIN EN 12369-2:2011-09 EN 12369-2:2011 (E) 8 The class values given in these tables shall be modified appropriately for service class and load duration in accordance with the requirements of EN 1
49、995-1-1. NOTE A data analysis has provided a conservative property relationship: - to bending for tension and compression values and; - to density for shear values. See Annex B for more information on this relationship. 6.2 Bending, tension and compression 6.2.1 General Testing according to EN 310 and application of the procedure in EN 326-2 for internal control enables the classification of the panels according to their composition and performances. Cha
