1、August 2009DEUTSCHE NORM English price group 8No 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!$Y6“1541996www
2、.din.deDDIN EN 409Timber structures Test methods Determination of the yield moment of dowel type fastenersEnglish version of DIN EN 409:2009-08Holzbauwerke Prfverfahren Bestimmung des Fliemoments von stiftfrmigen VerbindungsmittelnEnglische Fassung DIN EN 409:2009-08SupersedesDIN EN 409:1993-10www.b
3、euth.deDocument comprises 12 pagesDIN EN 409:2009-08 National foreword 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 Engin
4、eering Standards Committee), Technical Committee NA 005-04-01 AA Holzbau (Sp CEN/TC 124, CEN/TC 250/SC 5). Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. DIN shall not be held responsible for identifying any or all such patent ri
5、ghts. Amendments This standard differs from DIN EN 409:1993-10 as follows: a) References have been added in clause 2. b) Further symbols have been added in clause 4. c) The text of subclause 6.5 has been modified and extended. d) Figure 4 has been added. e) Further items have been added in subclause
6、 6.7. Previous editions DIN EN 409: 1993-10 2 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 409 April 2009 ICS 91.080.20 Supersedes EN 409:1993 English Version Timber structures Test methods Determination of the yield moment of dowel type fasteners Structures en bois Mthodes dessais Dterminat
7、ion du moment plastique des organes dassemblage de type tige Holzbauwerke Prfverfahren Bestimmung des Fliemoments von stiftfrmigen Verbindungsmitteln This European Standard was approved by CEN on 2 November 2006. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipula
8、te 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 Management Centre or to any CEN member. This European Standard ex
9、ists 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 the national standards b
10、odies 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 and United Kingdom. E
11、UROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2009 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 409:2009: EEN 409:2009 (E
12、) 2 Contents PageForeword 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 Results 7 6.7 Test report 7 Annex
13、 A (informative) Bending apparatus9 DIN EN 409:2009-08 EN 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 of a national standard, eit
14、her 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 EN 409: - references adde
15、d 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: Austria, Belgium, Bulgar
16、ia, 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. DIN EN 409:2009-08 EN 409:2009 (E
17、) 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. For undated referenc
18、es, 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 fasteners specified in EN
19、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 millimetres F1, F3maximum supp
20、ort 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 the dowel type fasten
21、er, 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. DIN EN 409:2009-08 EN 409:2009 (E) 5 6 Test methods 6.
22、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. The dimensions
23、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. DIN EN 409:2009-08 EN 409:2009 (E) 6 6.3 Apparatus The apparatus used for the
24、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. Figure 3 Y
25、ield 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 rotation a
26、ngle 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 used in wood
27、 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 timber density
28、 the rotation angle is: 244,0178,2 +=tkf(1) where DIN EN 409:2009-08 EN 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 bolts;kis
29、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 shall
30、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 informa
31、tion: a) description of the dowel type fastener; b) description of the test apparatus; DIN EN 409:2009-08 EN 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 plotting
32、 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 DIN EN 409:2009-08 EN 409:2009 (E) 9 Anne
33、x A (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 consi
34、sts 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); DIN EN 409:2009-08 EN 409:2009 (E) 10 c) the l
35、ever (5) 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 a
36、rm (3) shall 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
37、zero the 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 gauge, 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. DIN EN 409:2009-08
