BS EN 15737-2009 Timber structures - Test methods - Torsional resistance of driving in screws《木结构 测试方法 拧入螺钉时的抗扭强度》.pdf

1、BS EN 15737:2009ICS 91.080.20NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDTimber Structures Test methods Torsional resistance ofdriving in screwsThis British Standardwas published underthe authority of theStandards Policy andStrategy Committee on 30September

2、2009 BSI 2009ISBN 978 0 580 60935 0Amendments/corrigenda issued since publicationDate CommentsBS EN 15737:2009National forewordThis British Standard is the UK implementation of EN 15737:2009.The UK participation in its preparation was entrusted to TechnicalCommittee B/518, Structural timber.A list o

3、f organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisionsof a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunityfrom legal oblig

4、ations.BS EN 15737:2009EUROPEAN 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 vissageHolzbauwerke - Prfverfahren - E

5、inschraubdrehmomentvon 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 alteration. Up-to-date li

6、sts 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 translationunder the respo

7、nsibility 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, Greece, Hungary, Icela

8、nd, 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 NORMUNGManagement Centre: Avenue Marni

9、x 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: EBS EN 15737:2009EN 15737:2009 (E) 2 Contents Page Foreword 31 Scope 42 Normative references 43 Terms and definitions .44 Symbols 45 Material requ

10、irements .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 .7BS EN 15737:2009EN 15737:2009 (E) 3 Foreword This document (EN

11、 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 2010, and c

12、onflicting 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 rights. This

13、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 bound to impl

14、ement 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, Switzerland

15、 and the United Kingdom. BS EN 15737:2009EN 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 referenced documents are

16、 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 Determination of

17、 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 3.2 Test piece el

18、ement 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,rscrew insertion res

19、istance, 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 BS EN 15737:2009EN

20、 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) % relative humidity.

21、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 moisture conditioning ca

22、n 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 dimensions For solid t

23、imber 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 penetration shall be as minimum

24、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 based materials (right) B

25、S EN 15737:2009EN 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 vertical axis and mounting

26、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 measuring displacement shall be

27、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. Move the cross-head/screw

28、 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 embedded along its entire

29、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 arrangement for screw inserti

30、on in timber BS EN 15737:2009EN 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 specimen the maximum value of the sc

31、rew 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 relevant information on their sampling;

32、 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 conditioning; e) position and orientat

33、ion 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 - insertion method and speed; c) tempera

34、ture 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 shall be given: a) maximum value

35、 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 infl

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