EN 1156:2013
(Main)Wood-based panels - Determination of duration of load and creep factors
Wood-based panels - Determination of duration of load and creep factors
This European Standard specifies a method of determining in a constant climate both a duration of load factor and a creep factor for wood-based panels stressed in flatwise bending with and without a shear component. Details of an alternative but provisional method employing medium sized test pieces are given in Annex A; this method can also be used for test pieces loaded under varying climates.
NOTE The duration of load factor is necessary to modify the characteristic strength values obtained in short-term structural tests in order to derive long-term values. The creep factor obtained in the test is used to predict a long-term deflection from the initial elastic deflection.
Holzwerkstoffe - Bestimmung von Zeitstandfestigkeit und Kriechzahl
Diese Europäische Norm legt ein Verfahren zur Bestimmung der Zeitstandfestigkeit und der Kriechzahl von Holzwerkstoffen im Flachbiegeversuch mit und ohne Schubkomponente im Konstantklima fest. Einzelheiten zu einem alternativen aber vorläufigen Verfahren unter Verwendung von mittelgroßen Prüfkörpern sind im Anhang A aufgeführt, dieses Verfahren kann auch für Prüfkörper verwendet werden, die unter wechselnden Klimabedingungen belastet sind.
ANMERKUNG Die Kenntnis der Zeitstandfestigkeit ist notwendig, um die in Kurzzeitprüfungen gewonnenen charakteristischen Werte zu modifizieren und dadurch Langzeit-Werte zu erhalten. Die in der Prüfung ermittelte Kriechzahl dient der Ableitung einer Langzeit-Verformung aus der elastischen Ausgangsverformung.
Panneaux à base de bois - Détermination des facteurs de durée de charge et de fluage
La présente Norme européenne spécifie une méthode de détermination dans un climat constant, du facteur de durée de charge et du facteur de fluage pour les panneaux à base bois en flexion à plat avec et sans composante de cisaillement. Des détails sur une autre méthode provisoire employant des éprouvettes en semi-grandeur sont donnés dans l'Annexe A ; cette méthode peut aussi être utilisée pour des éprouvettes sous contrainte dans des climats variables.
NOTE Le facteur de durée de charge est nécessaire pour modifier les valeurs caractéristiques de résistance obtenues dans les essais de courte durée pour les usages en structure afin d'obtenir des valeurs pour les longues durées. Le facteur de fluage obtenu dans l'essai est utilisé pour estimer une flèche pour des longues durées à partir de la flèche élastique initiale.
Lesne plošče - Ugotavljanje faktorjev trajanja obremenitve in lezenja
Ta evropski standard določa metodo za ugotavljanje faktorjev trajanja obremenitve in lezenja pri konstantnih okoljskih pogojih za lesne plošče z upogibno obremenitvijo na površini s strižno komponento in brez nje. V dodatku B so podane podrobnosti o alternativni, vendar začasni metodi, ki zajema srednje velike preskusne dele; ta metoda se lahko uporablja tudi za preskusne dele v različnih okoljskih pogojih.
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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.HQMDHolzwerkstoffe - Bestimmung von Zeitstandfestigkeit und KriechzahlPanneaux à base de bois - Détermination des facteurs de durée de charge et de fluageWood-based panels - Determination of duration of load and creep factors79.060.01Wood-based panels in generalICS:Ta slovenski standard je istoveten z:EN 1156:2013SIST EN 1156:2013en,fr,de01-oktober-2013SIST EN 1156:2013SLOVENSKI
STANDARDSIST ENV 1156:20001DGRPHãþD
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 1156
April 2013 ICS 79.060.01 Supersedes ENV 1156:1998English Version
Wood-based panels - Determination of duration of load and creep factors
Panneaux à base de bois - Détermination des facteurs de durée de charge et de fluage
Holzwerkstoffe - Bestimmung von Zeitstandfestigkeit und Kriechzahl This European Standard was approved by CEN on 1 March 2013.
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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
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Avenue Marnix 17,
B-1000 Brussels © 2013 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 1156:2013: ESIST EN 1156:2013
Provisional test method for medium-size test pieces . 14 A.1 General . 14 A.2 Principle. 14 A.3 Apparatus . 14 A.4 Sampling of panels and the preparation of test pieces . 15 A.5 Procedure . 15 A.6 Expression of results . 15 A.7 Test report . 15 Bibliography. 16
1-buildings 3 Principle Determination in a constant climate of the load duration factor (loss in strength with time under load) and the creep factor (ratio of increase in deflection with time to the initial elastic deflection) in bending by applying and sustaining a constant moment over the central region of a test piece; both the time to failure, and the increase in deflection with time are measured. 4 Apparatus 4.1 Measuring instruments as specified in EN 325. 4.2 A number of test rigs (see Figure 1), that have essentially the following components: 4.2.1 Two parallel cylindrical supports of a length exceeding the width of the test piece and of diameter d = (15 ± 0,5) mm.
The distance between the supports shall be adjustable, and each support shall be capable of rotating in its frame. Two cylindrical loading rollers of the same length and diameter as the supports. These shall lie parallel to the supports, be capable of rotating, and be linked together with cross-arms of fixed length. SIST EN 1156:2013
Key F dead-load l1 = 150 t thickness l2 = 5 t
L = l1+10 t+60
d = 15 ± 0,5 Figure 1 — Test arrangement for applying load for static bending and creep tests with test piece in position 4.2.2 A suitable instrument for measuring the deflection of the test piece in the middle of the span which is graduated to allow a reading to 0,01 mm or better and which enables readings of the displacement at the centre of the upper surface of the test piece to be taken in relation to two points on the upper surface of the test piece each 60 mm from the transverse centre line (see Figure 2).
This general method will measure creep in bending free of any influence of shear (method 1). SIST EN 1156:2013
Key F dead-load Figure 2 — Method 1 (general method) for the measurement of deflection Where it is desired to measure creep in bending both with and without a shear component a measuring system as illustrated in Figure 3 shall be used (method 2). Dimensions in millimetres
Key F dead-load Figure 3 — Method 2 for the measurement of deflection with and without a shear component 4.3 An arrangement for testing the short-term bending strength with the same loading configuration to the creep test arrangement. 4.4 Weights (= dead load) for applying different constant loads (forces) on the test pieces. 4.5 A controlled environment room capable of maintaining a fixed temperature to ±1 °C and a fixed relative humidity to ± 3 %. 4.6 Equipment for recording temperature and relative humidity. SIST EN 1156:2013
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