EN 12369-2:2011
(Main)Wood-based panels - Characteristic values for structural design - Part 2: Plywood
Wood-based panels - Characteristic values for structural design - Part 2: Plywood
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 with EN 1995-1-1.
When utilizing the classification system for derivation of plywood characteristic values, this part of this standard can only be applied with reference to EN 636.
This part of this standard includes the characteristic values of the mechanical properties for plywood complying with EN 636 in bending, 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 determined 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 part of this 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/m3 and not exceeding 750 kg/m3.
Holzwerkstoffe - Charakteristische Werte für die Berechnung und Bemessung von Holzbauwerken - Teil 2: Sperrholz
Diese Europäische Norm gibt Informationen über charakteristische Werte für die Berechnung und Bemessung von Bauwerken, in denen Holzwerkstoffe eingesetzt werden. Die in dieser Norm angegebenen charak-teristischen Werte dienen zur Anwendung entsprechend den Festlegungen in EN 1995 1 1.
Bei der Ableitung von charakteristischen Werten von Sperrholz auf der Grundlage des Klassifizie-rungssystems ist diese Europäische Norm nur in Verbindung mit EN 636 anwendbar.
Diese Europäische Norm enthält die charakteristischen Werte der mechanischen Biege-, Zug-, und Druck-eigenschaften sowie des Schubs quer zur Plattenebene und in Plattenebene von Sperrholz nach EN 636. In EN 636 werden die Biegeeigenschaften in zwei Klassengruppen unterteilt, in eine für Steifigkeit und in die andere für Festigkeit. Steifigkeit und Festigkeit bei Zug und Druck betreffen dieselben Eigenschaften wie bei der Biegung.
Für die Schubeigenschaften von Platten werden feste Werte in Abhängigkeit von der Rohdichte angegeben.
Wo optimierte Werte erforderlich sind, werden die charakteristischen Werte direkt durch Prüfen nach EN 789 und EN 1058 bestimmt, oder durch eine Kombination der Prüfung der beiden genannten Normen und Berechnungen nach prEN 14272.
Diese Europäische Norm gilt für Platten, die die folgenden drei Bedingungen erfüllen:
- mindestens 5 Lagen und 6 mm Gesamtdicke;
- das Verhältnis zwischen der akkumulierten Dicke der Furniere einer Richtung zur akkumulierten Dicke der Querrichtung übersteigt den Wert 2,5 nicht;
- Holzarten mit einer mittleren Rohdichte, die größer als 350 kg/m3 und nicht größer als 750 kg/m3 ist.
Panneaux à base de bois - Valeurs caractéristiques pour la conception des structures - Partie 2: Contreplaqué
La présente norme européenne donne des informations sur les valeurs caractéristiques à utiliser dans la conception des structures incorporant des panneaux à base de bois. Les valeurs caractéristiques données dans la présente norme sont destinées à être utilisées avec l’EN 1995-1-1.
Lorsque le système de classification pour la déduction des valeurs caractéristiques du contreplaqué est utilisé, cette norme européenne ne peut être appliquée que conjointement avec l’EN 636.
La présente norme européenne contient les valeurs caractéristiques des propriétés mécaniques du contreplaqué conforme à l'EN 636 pour ce qui est de la flexion, de la traction, de la compression, du cisaillement de voile et du cisaillement roulant. L'EN 636 définit deux ensembles de classes pour les propriétés de flexion : un pour la rigidité et un autre pour la résistance. La rigidité et la résistance en traction et en compression sont liées aux mêmes propriétés en flexion.
Pour les propriétés de cisaillement, des valeurs fixes déterminées par corrélation avec la masse volumique sont indiquées.
Lorsque des valeurs optimisées sont nécessaires, les valeurs caractéristiques doivent être déterminées directement par essai conformément à l'EN 789 et l'EN 1058, ou par une combinaison d'essais conformes aux deux normes précédemment citées et de calculs conformes à prEN 14272.
La présente norme européenne s'applique aux panneaux répondant aux trois conditions suivantes :
- 5 couches au minimum et 6 mm d’épaisseur totale au minimum ;
- le rapport entre l'épaisseur cumulée dans une direction et l'épaisseur cumulée dans le sens travers ne doit pas excéder 2,5 ;
- essences de bois ayant une masse volumique moyenne supérieure à 350 kg/m3 et n'excédant pas 750 kg/m3.
Lesne plošče - Karakteristične vrednosti za dimenzioniranje konstrukcij - 2. del: Vezane plošče
Ta evropski standard zagotavlja podatke o značilnih vrednostih za uporabo pri dimenzioniranju konstrukcij, ki vsebujejo lesne plošče. Značilne vrednosti, podane v tem standardu, se uporabljajo v skladu z EN 1995-1-1. Pri uporabi sistema razvrščanja za izpeljavo značilnih vrednosti vezanega lesa se ta evropski standard lahko uporablja le s sklicevanjem na EN 636. Ta evropski standard vključuje značilne vrednosti mehanskih lastnosti za vezan les, ki ustreza EN 636 glede upogibanja, napetosti, stisljivosti, strižnih lastnosti plošč in ravninskih strižnih lastnosti. EN 636 razvršča upogibne lastnosti v dva sklopa razredov, ene za togost in druge za trdnost. Togost in trdnost pri napetosti in stiskanju se nanašata na iste lastnosti pri upogibanju. Za strižne lastnosti so podane fiksne vrednosti, določene s korelacijo do gostote. Kjer so potrebne optimizirane vrednosti, so značilne vrednosti določene neposredno s preskušanjem v skladu z EN 789 in EN 1058 ali s kombinacijo preskušanja v skladu s slednjima standardoma in izračunom v skladu s prEN 14272. Ta evropski standard velja za plošče, ki ustrezajo naslednjim trem pogojem: 5 plasti ali več in skupna debelina 6 mm in več; razmerje kumulativne debeline furnirjev v izmeničnih smereh ne presega 2,5; vrsta lesa s srednjo gostoto večjo kot 350 kg/m3 in ki ne presega 750 kg/m3.
General Information
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Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Holzwerkstoffe - Charakteristische Werte für die Berechnung und Bemessung von Holzbauwerken - Teil 2: SperrholzPanneaux à base de bois - Valeurs caractéristiques pour la conception des structures - Partie 2: ContreplaquéWood-based panels - Characteristic values for structural design - Part 2: Plywood79.060.10Vezan lesPlywoodICS:Ta slovenski standard je istoveten z:EN 12369-2:2011SIST EN 12369-2:2011en,fr,de01-oktober-2011SIST EN 12369-2:2011SLOVENSKI
STANDARDSIST EN 12369-2:20041DGRPHãþD
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 12369-2
June 2011 ICS 79.060.10 Supersedes EN 12369-2:2004English Version
Wood-based panels -Characteristic values for structural design - Part 2: Plywood
Panneaux à base de bois - Valeurs caractéristiques pour la conception des structures - Partie 2: Contreplaqué
Holzwerkstoffe - Charakteristische Werte für 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 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 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 versions.
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, 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 © 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: ESIST EN 12369-2:2011
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 . 17 SIST EN 12369-2:2011
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 European 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/m3 and not exceeding 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-based 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 surface 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 physical and mechanical tests SIST EN 12369-2:2011
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 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 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 typical 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. SIST EN 12369-2:2011
Table 1 — Load duration 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 load a In 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 elasticity (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 ρ Density of a wood species or of plywood (kg/m3) 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 (5th percentile) m Bending r Planar shear t Tension SIST EN 12369-2:2011
Wood species p
Panel mean or 50 Mean (50th percentile) mod related to modification factor for strength def related to modification factor for deflection 5 General In this standard the 5th percentile defines the characteristic value for: strength; density; modulus of elasticity where buckling, as an example, may be expected in service. Otherwise the 50th percentile 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 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).
Manufacturers utilising the EN 636 classification system for determination of characteristic valu
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