1、December 2009DEUTSCHE NORM English price group 7No part of this standard 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).ICS 91.080.20!$2(“1561505w
2、ww.din.deDDIN EN 15737Timber structures Test methods Torsional resistance of driving in screwsEnglish version of DIN EN 15737:2009-12Holzbauwerke Prfverfahren Einschraubdrehmoment von SchraubenEnglische Fassung DIN EN 15737:2009-12www.beuth.deDocument comprises pages9DIN EN 15737:2009-12 National fo
3、reword This standard has been prepared by Technical Committee CEN/TC 124 “Timber structures” (Secretariat: SFS, Finland). The responsible German body involved in its preparation was the Normenausschuss Bauwesen (Building and Civil Engineering Standards Committee), Technical Committee NA 005-04-01 AA
4、 Holzbau (Spa CEN/TC 124, CEN/TC 250/SC 5). 2 EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 15737August 2009ICS 91.080.20English VersionTimber Structures - Test methods - Torsional resistance ofdriving in screwsStructures en bois - Mthodes dessai - Force de torsion etrsistance au vissageHolzbauw
5、erke - Prfverfahren - Einschraubdrehmomentvon SchraubenThis European Standard was approved by CEN on 17 July 2009.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any al
6、teration. Up-to-date lists and bibliographical references concerning such nationalstandards 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 tra
7、nslationunder the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany,
8、 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 STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManageme
9、nt Centre: Avenue Marnix 17, B-1000 Brussels 2009 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 15737:2009: EEN 15737:2009 (E) 2 Contents Page Foreword 31 Scope 42 Normative references 43 Terms and definitions .44 Symbols 45 Materi
10、al requirements .45.1 Fasteners 46 Test Methods 56.1 General 56.2 Conditioning .56.3 Sampling .56.4 Test piece dimensions 57 Test 67.1 Test setup .67.2 Procedure .67.3 Results 78 Test report 78.1 Test piece .78.2 Test method 78.3 Test results .7DIN EN 15737:2009-12 EN 15737:2009 (E) 3 Foreword This
11、document (EN 15737:2009) has been prepared by Technical Committee CEN/TC 124, “Timber Structures”, the secretariat of which is held by SFS. 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 February
12、 2010, and conflicting national standards shall be withdrawn at the latest by February 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 r
13、ights. This test standard provides information how to determine the torsional resistance to insertion of screws into timber with a reference to requirements specified in EN 14592. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are b
14、ound 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,
15、 Switzerland and the United Kingdom. DIN EN 15737:2009-12 EN 15737:2009 (E) 4 1 Scope This standard specifies a test method to determine the torsional resistance to driving of screws in solid timber or glued laminated timber or other wood based materials. 2 Normative references The following referen
16、ced documents are essential to the use 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 14592:2008, Timber Structures Dowel type fasteners - Requirements ISO 3130, Wood
17、 Determination of moisture content for physical and mechanical tests ISO 3131, Wood Determination of density for physical and mechanical tests 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 Moment cell device that records the torque applied
18、3.2 Test piece element or part of an element that will include the driven screw after the test made of solid timber, glued laminated timber or wood based materials or combinations of these materials 4 Symbols P Penetration ratio; Rtor,maxmaximum screw insertion moment, in Newton millimetre; Rtor,rsc
19、rew insertion resistance, in Newton millimetre; Rtor,s screw insertion strength, in Newton millimetre; d nominal diameter, in millimetre; l is total length of the screw, in millimetre. 5 Material requirements 5.1 Fasteners The screws shall comply with the requirements given in 6.3 of EN 14592:2008 D
20、IN EN 15737:2009-12 EN 15737:2009 (E) 5 6 Test Methods 6.1 General The moisture content and density of the test piece shall be determined according to ISO 3130 and ISO 3131. 6.2 Conditioning The test pieces shall be manufactured at an equilibrium moisture content corresponding to (20 2) C and (65 5)
21、 % relative humidity. The material is conditioned when it attains constant mass. Constant mass is considered to be attained when the results of successive weightings, carried out at an interval of 6 h, do not differ, by more than 0,1 % of the mass of the material. For further investigations other mo
22、isture conditioning can be appropriate, and shall be reported. 6.3 Sampling The density of the test pieces or components of the test piece shall comply with the density of the grade used in practise. The upper surface (receiving the point) shall predominantly be radial or tangential. 6.4 Test piece
23、dimensions For solid timber and glued laminated timber test pieces the minimum dimensions are given in Figure 1. For test pieces made of wood based materials or combinations of wood based materials and solid timber or glued laminated timber the dimensions in the direction perpendicular to penetratio
24、n shall be as minimum 20 d, where d is the nominal diameter of the screw. The test piece dimension in penetration direction shall always allow full penetration of the screw. Key d screw nominal diameter l total length of the screw grain direction Figure 1 Test piece of solid wood (left) and wood bas
25、ed materials (right) DIN EN 15737:2009-12 EN 15737:2009 (E) 6 7 Test 7.1 Test setup The test piece is mounted on the base plate of a frame and fixed in such a way as to prevent any movement during the test. The test rig should allow fixing a moment cell to the screwing device capable of moving in a
26、vertical axis and mounting displacement transducers on either side of the screwing device to measure vertical displacement. An example is given in Figure 2. The moment cell used shall be capable of measuring the torque to an accuracy of 1 % of the torque applied to the screw. The equipment for measu
27、ring displacement shall be capable of measuring to an accuracy of 1 % of the measured value. 7.2 Procedure Fix a drive bit into the moment cell and mount a screw into the bit. The screw should be installed according to the manufacturers instructions, including any advice on pre-drilling requirements
28、. Move the cross-head/screw assembly into a position where the screw tip is resting on the top of the test specimen. Drive the screw into the test specimen, either by using a mechanical drill or screwing machine, or by using a hand screw wrench ( 100 revolutions per minute), until the screw is fully
29、 embedded along its entire length in the specimen. For countersunk screws this includes the thickness of the head. Key 1 Mechanical drill, screwing machine, or hand screw wrench, screwing device 2 Drill chuck/bit 3 Moment cell 4 Screw 5 Displacement transducers 6 Timber Figure 2 Example of a test ar
30、rangement for screw insertion in timber DIN EN 15737:2009-12 EN 15737:2009 (E) 7 The vertical displacement of the cross-head to screw assembly shall be recorded via the displacement transducers, and the screw insertion moment shall be recorded via the moment cell. 7.3 Results Determine for each spec
31、imen the maximum value of the screw insertion moment, Rtor,maxprior to the point at which the screw head comes into contact with the test piece surface given by the moment cell. 8 Test report 8.1 Test piece The following information shall be given: a) technical specification of the screw and relevan
32、t information on their sampling; b) description of the test piece, specification of the material, species or type, grade, density, moisture content, deviations from specifications, characteristics near the insertion point that might affect the result; c) sizes of the test pieces; d) method of condit
33、ioning; e) position and orientation of the screw; f) details of predrilling (including any countersink); g) any other information, which may have influenced the test results. 8.2 Test method The following information shall be given: a) reference to this test standard; b) test method applied - insert
34、ion method and speed; c) temperature and relative humidity at the time of test; d) description of the testing device, the test equipment and the measuring instruments; e) any other information which may have influenced the test results. 8.3 Test results The following information for each test piece
35、shall be given: a) maximum value of the screw insertion moment; b) moisture content of the test piece material; c) actual dimensions, position of the insertion point; d) location of failure if any in the test piece or screw; e) plot of the moment to penetration depth for each specimen; f) any other information, which may have influenced the test results. DIN EN 15737:2009-12
