1、BRITISH STANDARD Wood-based panels Determination of edgewise bending properties The European Standard EN 13879:2002 has the status ofa British Standard ICs 79.060.01 BS EN 13879:2002 WkNb A%“ U- rn% E rn NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW $ present to the responsi
2、ble international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. - A list of organizations represented on this committee can be obtained on req
3、uest to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search”faci1ity ofthe BSI El
4、ectronic Catalogue or ofBritish Stan dards Online. This publication does not purport to include all the necessary provisions of a contract. Users of this publication are responsible for their correct application. Compliance with a British Standard does not ofitself confer immunity from legal obligat
5、ions. This British Standard, having been prepared under the direction of the Building and Civil Engineering Sector Policy and Strategy Committee, was published under the authority of the Standards Policy and Strategy Committee on 2 July 2002 Summary of pages This document comprises a front cover, an
6、 inside front cover, the EN title page, pages 2 to 9 and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd.No. I Date I Comments O BSI 2 July 2002 ISBN O 580 39977 X EUROPEAN STANDARD NORME EUROPENNE E
7、UROPISCHE NORM EN 13879 May 2002 ICs 79.060.01 English version Wood-based panels - Determination of edgewise bending properties Panneaux base de bois - Dtermination des proprits de flexion sur chant Holzwerkstoffe - Bestimmung der Eigenschaften bei Hoch kantbiegung This European Standard was approve
8、d by CEN on 14 March 2002 CEN members are bound to comply with the CENKENELEC 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 stand
9、ards may be obtained on application to the 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 th
10、e Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and Un
11、ited Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION EUROPISCHES KOMITEE FR NORMUNG COMIT EUROPEN DE NORMALISATION Management Centre: rue de Stassart, 36 B-1050 Brussels O 2002 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 13879:
12、2002 E EN 13879:2002 (E) Contents page Foreword 3 1 Scope 4 2 Normative references 4 3 Principle 4 4 Test pieces 4 5 Conditioning . 8 6 Procedure . 8 7 Expression of results 8 8 Test report 9 2 EN 13879:2002 (E) Foreword This document (EN 13879:2002) has been prepared by Technical Committee CEN/TC 1
13、12, “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 November 2002, and conflicting national standards shall be withdrawn at the latest
14、 by November 2002. According to the CENKENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta,
15、 Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. 3 EN 13879:2002 (E) 1 Scope This European Standard specifies a method for the determination of strength, stiffness, creep and duration of load when wood-based panels are loaded in edgewise bending. It is not applicabl
16、e to extruded panels. 2 Normative references This European Standard incorporates, by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text, and the publications are listed hereafter. For dated references, subsequent
17、 amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references, the latest edition of the publication referred to applies (including amendments). EN 31 O, Wood-based panels - Determination of modu
18、lus of elasticity in bending and of bending strength. EN 789, Timber structures - Test methods - Determination of mechanical properties of wood based panels. ENV 1 156, Wood-based panels - Determination of duration of load and creep factors. 3 Principle The bending properties are determined on test
19、pieces prepared from panel strips, facewise fixed together forming a test piece which can be tested according to one of the three test methods for flatwise bending described in the following standards EN 310, EN 789, ENV 1156. 4 Test pieces 4.1 Number of test pieces 4.1 .I General Each test piece sh
20、all contain strips from only one panel and one panel direction. 4.1.2 Number of strips per test piece and test pieces per panel for EN 310 size test pieces For each direction to be tested, the number of test pieces is given in Table 1. 4 EN 13879:2002 (E) Thickness of panel mm Table 1 - Number of st
21、rips per test piece and test pieces per panel for EN 310 size test pieces Number of strips per test piece Number of test pieces per direction and panel to be tested Thickness of panel mm 3 I 3 I 16 I 3 Number of strips per test piece Number of test pieces per direction and panel to be tested 1 O0 1
22、I 4 I 12 I 3 I 5 I 10 I 3 I 6 I 8 I 3 I 7 I 7 I 3 I 8 I 6 I 3 I 9 I 5 I 3 I 10 I 5 I 3 I 12 I 4 I 4 I 14 I 3 I 5 I 16 I 3 I 5 I 18 I 2 I 6 I 20 I 2 I 6 I 25 I 2 I 6 I 25 I 1 I 6 4.1.3 Number of strips per test piece and test pieces per panel for EN 789 size test pieces For each direction to be teste
23、d, the number of test pieces is given in Table 2 Table 2 - Number of strips per test piece and test pieces per panel for EN 789 size test pieces I 4 I 75 I 1 I 5 I 60 I 1 I 6 I 50 I 1 I 7 I 43 I 1 I 8 I 38 I 1 I 9 I 33 I 1 I 10 I 30 I 1 I 12 I 25 I 1 I 14 I 22 I 1 I 16 I 19 I 1 I 18 I 17 I 1 I 20 I
24、15 I 1 I 30 I 10 I 1 5 EN 13879:2002 (E) Thickness of panel mm 3 4 4.1.4 Number of strips per test piece and test pieces per panel for ENV 1156 size test pieces Number of strips per test piece Number of test pieces per direction and panel to be tested 16 3 12 3 For each direction to be tested, the n
25、umber of test pieces is given in Table 3 18 2 10 5 10 3 6 8 5 7 7 5 8 6 5 9 5 5 10 5 5 12 4 6 14 3 8 16 3 8 I 20 I 2 I 10 I 25 I 2 I 10 25 1 10 4.2 Preparation of test pieces 4.2.1 Adhesives and fasteners Use a low modulus glue, an adhesive film or a mechanical fastener which will not increase the s
26、tiffness and strength of the test piece. Apply the adhesive or fastener to the test piece at the loading point(s) and at the supports. 4.2.2 Small size test pieces (see EN 310) Prepare strips with a length of 560 mm and a width (w) of a least 30 mm. Fix the strips together face to back to make a tes
27、t piece with the dimensions 560 mm x (Ca. 50) mm x w mm. Cut the test piece to a length of 550 mm and a thickness of 25 mm. The width of the test piece is dependent on the thickness of the strips (see Figure 1). Test pieces with less homogeneous material (e.g. plywood, LVL, OSB and solid wood panels
28、) and a thickness more than 16 mm shall be tested with a height of 50 mm. The test piece size shall then be changed in accordance with the test method (see EN 310). 6 EN 13879:2002 (E) Dimensions in millimetres Figure 1 - Small size test piece for edgewise bending 4.2.3 Medium size test pieces (see
29、EN 789) Prepare strips with a length of 1 200 mm and a width (w) of 30 mm. Fix the strips together face to back to make a test piece with the dimensions 1 200 mm x (Ca. 300) mm x w mm. Cut the test piece to a length of 1 150 mm and a thickness of 25 mm. The width of the test piece is dependent on th
30、e thickness of the strips (see Figure 2). Dimensions in millimetres Figure 2 - Medium size test piece for edgewise bending 4.2.4 Test pieces for duration of load and creep test (see ENV 1156) Prepare strips with a length of 500 mm and a width (w) of 30 mm. Fix the strips together face to back to mak
31、e a test piece with the dimensions 500 x (Ca. 50) x w mm. Cut the test piece to a length of 460 mm and a thickness of 25 mm. The width of the test piece is dependent on the thickness of the strips (see Figure 3). Test pieces with less homogeneous material (e.g. plywood, LVL, OSB and solid wood panel
32、s) and a thickness more than 16 mm shall be tested with a height of 50 mm. The test piece size shall then be changed in accordance with the test method (see ENV 1156). 7 EN 13879:2002 (E) Dimensions in millimetres Figure 3 - Test pieces for duration of load and creep test for edgewise bending 5 Cond
33、itioning Before testing, the test pieces shall be conditioned to constant mass in accordance with the relevant test standard EN 310, EN 789, ENV 1156. 6 Procedure 6.1 Small size test pieces Carry out the test in accordance with EN 310. 6.2 Medium size test pieces Carry out the test in accordance wit
34、h EN 789 6.3 Test pieces for duration of load and creep test Carry out the test in accordance with ENV 11 56. 7 Expression of results 7.1 Small size test pieces Express results in accordance with EN 310. 7.2 Medium size test pieces Express results in accordance with EN 789. 7.3 Test pieces for durat
35、ion of load and creep test Express results in accordance with ENV 1156. 8 EN 13879:2002 (E) 8 Testreport According to the relevant test standard EN 31 O, EN 789, ENV 11 56. 9 BS EN 13879:2002 B SI 389 Chiswick High Road London w4 4AL BSI -British Standards Institution BSI is the independent national
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