1、BS EN 15736:2009ICS 91.080.20NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDTimber Structures Test methods Withdrawal capacityof punched metalplate fasteners inhandling and erectionof prefabricatedtrussesThis British Standardwas published underthe authority of
2、theStandards Policy andStrategy Committee on 30September 2009 BSI 2009ISBN 978 0 580 57299 9Amendments/corrigenda issued since publicationDate CommentsBS EN 15736:2009National forewordThis British Standard is the UK implementation of EN 15736:2009.The UK participation in its preparation was entruste
3、d to 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
4、a British Standard cannot confer immunityfrom legal obligations.BS EN 15736:2009EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 15736 August 2009 ICS 91.080.20 English Version Timber Structures - Test methods - Withdrawal capacity of punched metal plate fasteners in handling and erection of pre
5、fabricated trusses Structures en bois - Mthode dessai - Rsistance larrachement des connecteurs plaque mtallique emboutie Holzbauwerke - Prfverfahren - Ausziehwiderstand von Nagelplatten unter Transport- und Montagezustnden in vorgefertigten Fachwerktrgern This European Standard was approved by CEN o
6、n 17 July 2009. CEN members are bound to comply with the CEN/CENELEC 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 standards may
7、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 translation under the responsibility of a CEN member into its own language and notified to the CEN
8、 Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherland
9、s, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN 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 an
10、y form and by any means reserved worldwide for CEN national Members. Ref. No. EN 15736:2009: EBS EN 15736:2009EN 15736:2009 (E) 2 Contents Page Foreword 31 Scope 42 Normative references 43 Terms and definitions .44 Symbols 45 Material requirements .55.1 Timber .55.2 Fasteners 56 Test Methods 56.1 Ge
11、neral 56.2 Conditioning .56.3 Production of the test pieces .56.4 Sampling .57 Test procedure .57.1 General 57.2 Method 1 Four point bending 57.2.1 Test piece .57.2.2 Procedure .67.3 Method 2 Shear test 77.3.1 Test piece .77.3.2 Procedure .78 Test report 88.1 Test piece .88.2 Test method 98.3 Test r
12、esults .9BS EN 15736:2009EN 15736:2009 (E) 3 Foreword This document (EN 15736:2009) 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 i
13、dentical text or by endorsement, at the latest by February 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
14、 held responsible for identifying any or all such patent rights. For safe handling of trusses with punched metal plate fasteners accidental loads during the time between productions and erection should not cause damage that impairs the structural performance as outlined 9.2.1 (7)P of EN 1995-1-1:200
15、4. This test method provides information about the sensitivity of the punched metal plate fasteners to resist these types of actions. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Aust
16、ria, 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 the United Kingdom. BS EN 157
17、36:2009EN 15736:2009 (E) 4 1 Scope This European Standard specifies a test method to determine the withdrawal behaviour of punched metal plate fasteners. 2 Normative references The following referenced documents are essential to the use of this document. For dated references, only the edition cited
18、applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 1075:1999, Timber Structures Test methods Joints made with punched metal plate fasteners EN 14250, Timber Structures Product requirements for prefabricated structural members assembl
19、ed with punched metal plate fasteners EN 14545, Timber Structures Connectors requirements EN 26891, Timber Structures Joints with mechanical fasteners General principles for the determination of strength and deformation characteristics (ISO 6891:1983) EN 28970, Timber Structures Testing of joints wi
20、th mechanical fasteners Requirements for wood density (ISO 8970:1989) ISO 3130, Wood 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
21、terms and definitions apply. 3.1 Depth refers to the depth of the test piece and testing in bending. As the tests are conducted in flat wise bending this will relate to the thickness of the timber and therefore to the smallest cross-sectional dimension 3.2 Width refers to the width of the test piece
22、 as tested; the largest cross-sectional dimension 4 Symbols h depth; b width; wmcentre span displacement in the bending test, in millimetre; wvrelative displacement in the shear test, in millimetre. BS EN 15736:2009EN 15736:2009 (E) 5 5 Material requirements 5.1 Timber Timber members shall comply wi
23、th the requirements given in EN 14250. The timber shall be selected in accordance with EN 28970. 5.2 Fasteners The punched metal plate fasteners shall comply with the requirements given in EN 14545. 6 Test Methods 6.1 General The moisture content and density of the timber at test shall be determined
24、 as specified by ISO 3130 and ISO 3131 as appropriate. 6.2 Conditioning The test pieces shall be manufactured with the timber at an equilibrium moisture content corresponding to (20 2) C and (65 5) % relative humidity. The material is conditioned when it attains constant mass. Constant mass is consi
25、dered 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 can be appropriate, and shall be reported. 6.3 Production of the test pieces The f
26、abrication of the joints shall comply with EN 14250. 6.4 Sampling Void 7 Test procedure 7.1 General This European Standard specifies two methods for testing. 7.2 Method 1 Four point bending 7.2.1 Test piece The test piece consists of two timber members of equal length and cross-section, which are jo
27、ined by symmetrically positioned punched metal plates (see Figure 1 and Figure 2). The requirements of 6.1 and 6.3 of EN 1075:1999 apply. The test piece shall be fabricated so that the pieces of timber in the test piece are separated by a gap of not less than 4 mm. The test piece shall have a minimu
28、m length of 19 times the depth of the cross-section. When this is not possible, the span to depth ratio shall be reported. BS EN 15736:2009EN 15736:2009 (E) 6 7.2.2 Procedure The test piece shall be symmetrically loaded in flat wise bending at two points over a span of 18 times the depth of the timb
29、er as shown in Figure 1. If the test piece and equipment do not permit these conditions to be achieved exactly, the distance between the load points and supports may be changed by an amount not greater than 1,5 times the piece depth, and the span and the test piece length may be changed by an amount
30、 not greater than 3 times the piece depth, while maintaining the symmetry of the test. The joint is positioned centrally between the supports. The test piece shall be simply supported. NOTE 1 Small steel plates of length not greater than the depth of the test piece may be inserted between the piece
31、and the loading heads or supports to minimize local indentation Load shall be applied according to EN 26891. NOTE 2 The loading rate should be determined from the results of preliminary tests. The loading equipment used shall be capable of measuring the load to an accuracy of 1 % of the maximum load
32、 applied to the test piece. The deformation, wmshall be taken as the average of the measurements on both faces at the neutral axis, and shall be measured at the centre of the span (see Figure 1). The measurement equipment used shall be capable of measuring deformation to an accuracy of 1 % or, for d
33、eformations less than 2 mm, with an accuracy of 0,02 mm. If the test configuration differs from the above in any way then these differences are recorded. Figure 1 Test arrangement for measuring the local withdrawal in bending The withdrawal bending load is defined as the maximum load before the gap
34、is closed at the compression size of the connection. BS EN 15736:2009EN 15736:2009 (E) 7 Key d edge distance g overlap e plate width i gap f timber width j total plate length Figure 2 Top view of specimen at mid span 7.3 Method 2 Shear test 7.3.1 Test piece The test piece consists of two timber piec
35、es of equal depth that are joined together at right angles by punched metal plates forming a symmetrical T-shape test specimen (see Figure 3). The requirements of 6.1 and 6.3 of EN 1075:1999 apply. The member with the largest length shall have a minimum length of 10 times the depth of the cross-sect
36、ion. The short member is centrally joined by punched metal plates to the long member at right angles and is simply supported at both ends. A gap of 10 2 mm exist between support and the longest member (see Figure 3). The total length of the short piece equals the width of the large member plus twent
37、y millimetres plus twice the support length. The support length is equal to the width of the short member. When this is not possible the other dimensions shall be shall be reported. 7.3.2 Procedure The test piece shall be loaded at a distance of 4 times the depth of the timber from the gap between t
38、he large and short member (see Figure 3). The distance between the load point and support may be changed by an amount not greater than the depth if the test piece and equipment do not permit these conditions to be achieved exactly. For the same reason, the support length of the smallest piece may be
39、 changed by an amount not greater than 0,2 times the width, while maintaining the symmetry of the test. NOTE 1 Small steel plates of length not greater than the depth of the test piece may be inserted between the piece and the loading heads or supports to minimize local indentation. Load shall be ap
40、plied according to EN 26891. NOTE 2 This rate should be determined from the results of preliminary tests. The objective is that the time to reach maximum load for each piece is 300 s 120 s. The loading equipment used shall be capable of measuring the load to an accuracy of 1 % of the load applied to
41、 the test piece. The deformation, wsshall be taken as the average of the measurements on both faces at the neutral axis, and shall be measured at the shear plane of the connection and measure the relative displacements between the long and short member (see Figure 3). BS EN 15736:2009EN 15736:2009 (
42、E) 8 The withdrawal shear load is defined as the maximum load before the shear load displacement curve exhibit a pronounced hardening. Key relative displacement of members to be measured top view of transducer Figure 3 Top and side view of shear test specimen 8 Test report The test report shall incl
43、ude details of the test piece, the test method used and the test results. 8.1 Test piece The following information shall be given: a) technical specification of the punched metal plates; b) moisture content at time of test; c) technical specification of the timber and punched metal plate; d) dimensi
44、ons of the timber members and punched metal plates; e) deviations from specifications, strength reducing characteristics near the joint; f) method of conditioning; g) moisture content of the timber at test; h) position and orientation of the punched metal plate, overlap, gap, edge distance, producti
45、on method; BS EN 15736:2009EN 15736:2009 (E) 9 i) 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; c) temperature and relative humidity at the time of test; d) desc
46、ription of the load 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) location of failure of the punched metal plate or timber if any
47、; b) load applied in relation to the recorded displacements taken during the test; load displacement graphs; c) maximum load of each test specimen; d) any other information, which may have influenced the test results. BS EN15736:2009BSI GroupHeadquarters 389Chiswick High Road,London, W4 4AL, UKTel +
48、44 (0)20 8996 9001Fax +44 (0)20 8996 - British Standards InstitutionBSI is the independent national body responsible for preparing BritishStandards. It presents the UK view on standards in Europe and at theinternational level. It is incorporated by Royal Charter.RevisionsBritish Standards are updat
49、ed by amendment or revision. Users of BritishStandards should make sure that they possess the latest amendments oreditions.It is the constant aim of BSI to improve the quality of our products and services.We would be grateful if anyone finding an inaccuracy or ambiguity while usingthis British Standard would inform the Secretary of the technical committeeresponsible, the identity of which can be found on the inside front cover. Tel:+44 (0)20 8996
