BS EN 409-2009 Timber structures - Test methods - Determination of the yield moment of dowel type fasteners《木结构 试验方法 榫型紧固件屈服力矩的测定》.pdf

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1、BS EN 409:2009ICS 91.080.20NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDTimber structures Test methods Determination of theyield moment of doweltype fastenersThis British Standardwas published under theauthority of the StandardsPolicy and StrategyCommittee on

2、 30 April2009 BSI 2009ISBN 978 0 580 56919 7Amendments/corrigenda issued since publicationDate CommentsBS EN 409:2009National forewordThis British Standard is the UK implementation of EN 409:2009. Itsupersedes BS EN 409:1993 which is withdrawn.The UK participation in its preparation was entrusted to

3、 TechnicalCommittee B/518, Structural timber.A list of 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 Br

4、itish Standard cannot confer immunityfrom legal obligations.BS EN 409:2009EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 409April 2009ICS 91.080.20 Supersedes EN 409:1993 English VersionTimber structures - Test methods - Determination of the yieldmoment of dowel type fastenersStructures en bois -

5、 Mthodes dessais - Dtermination dumoment plastique des organes dassemblage de type tigeHolzbauwerke - Prfverfahren - Bestimmung desFliemoments von stiftfrmigen VerbindungsmittelnThis European Standard was approved by CEN on 2 November 2006.CEN members are bound to comply with the CEN/CENELEC Interna

6、l Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. 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.T

7、his European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder 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 t

8、he national standards bodies of 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

9、 and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement 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 409:2009:

10、 EBS EN 409:2009EN 409:2009 (E) 2 Contents Page Foreword 3 1 Scope 4 2 Normative references 4 3 Terms and definitions .4 4 Symbols and abbreviations 4 5 Requirements .4 6 Test methods 5 6.1 Principle 5 6.2 Materials .5 6.3 Apparatus .6 6.4 Preparation of the specimen 6 6.5 Loading procedure 6 6.6 Re

11、sults 7 6.7 Test report 7 Annex A (informative) Bending apparatus9 BS EN 409:2009EN 409:2009 (E) 3 Foreword This document (EN 409:2009) 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 o

12、f a national standard, either by publication of an identical text or by endorsement, at the latest by October 2009, and conflicting national standards shall be withdrawn at the latest by October 2009. This document supersedes EN 409:1993. The following changes have been introduced in this version of

13、 EN 409: - references added in Clause 2; - symbols added in 4; - text of 6.5 modified and extended; - Figure 4 added; - items added in 6.7. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard

14、: 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 and United Kingdom. BS EN 4

15、09:2009EN 409:2009 (E) 4 1 Scope This European Standard specifies a method for determining the yield moment of dowel type fasteners. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies.

16、 For undated references, the latest edition of the referenced document (including any amendments) applies. EN 14592, Timber structures Dowel-type fasteners Requirements 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 dowel type fastener faste

17、ners specified in EN 14592 3.2 yield moment bending moment when the specimen is deformed through a prescribed rotation angle 4 Symbols and abbreviations For the purposes of this document, the following symbols and abbreviations apply. d nominal dowel type diameter according to EN 14592, in millimetr

18、es F1, F3maximum support loads on the dowel type fastener, in newtons F2, F4test loads applied to the dowel type fastener, in newtons l1, l3distances between loading points and the nearest support, in millimetres, see Figure 1 l2free length of the nail in millimetres, see Figure 1 Myyield moment of

19、the dowel type fastener, in newton millimetres , 1, 2rotation angle, in degrees kis the characteristic density of the timber, in kg/m3ftis the tensile strength of the fastener, N/mm25 Requirements The requirements for dowel type fasteners as given in EN 14592 apply. BS EN 409:2009EN 409:2009 (E) 5 6

20、 Test methods 6.1 Principle The principle of the test involves the loading of the dowel type fastener under test as shown in Figure 1 in such a manner that the loading points do not move along the dowel type fastener and the loads remain normal to the axis of the dowel type fastener during the test.

21、 The dimensions l1and l3shall be at least 2d. The free length of the dowel type fastener, l2, shall be between d and 3d. Figure 1 Example of loading principle for nails Figure 2 Example of nail deformation 6.2 Materials EN 14592 applies. BS EN 409:2009EN 409:2009 (E) 6 6.3 Apparatus The apparatus us

22、ed for the test shall be such that the loads F2and F4(see Figures 1 and 2) do not deviate by more than 5 % from each other. The bending moment diagram for the resulting yield moment Myis shown in Figure 3. NOTE A test apparatus, which has been found to be suitable for this test, is shown in Annex A.

23、 Figure 3 Yield moment My on the dowel type fastener 6.4 Preparation of the specimen The nail shall be tested about its weakest axis. 6.5 Loading procedure 6.5.1 General The load shall be applied to the dowel type fastener as shown in Figure 1, and shall be increased at such a rate that at least the

24、 rotation angle according to 6.5.2 is reached in 10 s 5 s. Record the loads and the corresponding values of the rotation angle during the test. The load shall be determined to an accuracy of 1 %. 6.5.2 Rotation angle For nails and staples the rotation angle shall be 45. For screws, dowels or bolts u

25、sed in wood based products the rotation angle is 110/d degree. For screws, dowels or bolts with a tensile strength of 1 000 N/mm2used in timber with a characteristic density of 360 kg/m3the rotation angle is given in Figure 4. For different tensile strength values or/and different characteristic tim

26、ber density the rotation angle is: 244,0178,2 +=tkf(1) where BS EN 409:2009EN 409:2009 (E) 7 is the rotation angle to be used in the determination of the yield moment, in degrees; 1is the rotation angle according to Figure 4, in degrees; 2is 10 for nails, staples and screws and 0 for dowels and bolt

27、s;kis the characteristic density of the timber where fastener is to be applied, kg/m3; ftis the tensile strength of the fastener, N/mm2. 6.6 Results Determine the load, F1and F3, at the rotation angle according to 6.5.2. The yield moment, My, shall be calculated as given by: 11y33xmax (2)xFlMFl=and

28、shall be determined to an accuracy of 1 %. 0,02,04,06,08,010,012,014,016,018,020,08 1012141618202224262830d RKey R rotation angle, 1, in degrees d diameter of the dowel type fastener, in mm Figure 4 Rotation angle versus fastener diameter 6.7 Test report The test report shall include the following i

29、nformation: a) description of the dowel type fastener; b) description of the test apparatus; BS EN 409:2009EN 409:2009 (E) 8 c) location of the free length, l2, along the shank of the dowel type fastener in the test; d) tensile strength of the steel; e) characteristic wood density; f) graphs plottin

30、g the values of the rotation angle and load; g) rotation angle used for calculating the yield moment; h) value of the yield moment; i) failure mode of the fastener at the rotation given by Equation (1). j) reference to this European Standard, i.e. EN 409:2009 BS EN 409:2009EN 409:2009 (E) 9 Annex A

31、(informative) Bending apparatus A.1 Apparatus Key 1) fastener 2) loose fitting bushing 3) arm 4) loose fitting bushing 5) lever 6) rod 7) load gauge 8) nail A) rotation point Figure A.1 Example of loading apparatus for nails A bending apparatus suitable for nails is shown in Figure A.1 and consists

32、of the following: a) the nail under test (1) is held at one end in a loose fitting bushing (2) fixed to an arm (3) that can be rotated about point A; b) the other end of the nail is put into a loose fitting bushing (4) which is fixed to a lever (5); BS EN 409:2009EN 409:2009 (E) 10 c) the lever (5)

33、is suspended on a load gauge (7) by a rod (6) having freely rotating joints at both ends and having its axis perpendicular to the lever. The dimensions: h from the axis of rotation, point A in Figure A.1, to the axis of the nail and b between the axis of rotation A and the leading edge of arm (3) sh

34、all be so small in relation to the lengths of the lever 14 and of the rod 15 that the right angle between the rod and lever does not change by more than 0,1 rad during testing. The lever shall be stiff compared to the nail. With the arm (3) resting on the nail and the load gauge (7) set to zero the

35、test shall be commenced by rotating arm (3) about axis A until the condition of yield within the free length is reached. The length of bushings (2) and (4) shall not differ by more than 5 %. A.2 Expression of results max 4.max 4 2maxmax12ylevFxlMGF lxlF=+(3) where Frnax is the maximum load on the ga

36、uge, in newtons; Gtev is the self weight of the lever, in newtons; l2 is the free length of the nail, in millimetres; l4 is the length of the lever, in millimetres. BS EN 409:2009This page has been intentionally left blank BS EN 409:2009BSI GroupHeadquarters 389Chiswick High Road,London, W4 4AL, UKT

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