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1、BRITISH STANDARD BS EN 12512:2001 Incorporating Amendment No. 1 Timber structures Test methods Cyclic testing of joints made with mechanical fasteners The European Standard EN 12512:2001, with the incorporation of amendment A1:2005, has the status of a British Standard ICS 21.060.01; 91.080.20 ? Lic
2、ensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 06:30:44 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 12512:2001 This British Standard, having been prepared under the direction of the Building and Civil Engineering Sector Policy and Strategy Committee, was published under the authority of th
3、e Standards Policy and Strategy Committee on 5 April 2002 BSI 16 December 2005 ISBN 0 580 39461 1 National foreword This British Standard is the official English language version of EN 12512:2001, including amendment A1:2005. The start and finish of text introduced or altered by CEN amendment is ind
4、icated in the text by tags !“. Tags indicating changes to CEN text carry the number of the CEN amendment. For example, text altered by CEN amendment A1 is indicated by !“. The UK participation in its preparation was entrusted by Technical Committee B/518, Structural timber, to Subcommittee B/518/1,
5、Test methods, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Catalog
6、ue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its corre
7、ct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep UK interests informed
8、; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 14, an inside back cover and a back cover. The BSI copyright date displayed in this document indicates
9、 when the document was last issued. Amendments issued since publication Amd. No. DateComments 1604516 December 2005See national foreword Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 06:30:44 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 125
10、12 November 2001 ICS 21.060.01; 91.080.20 English version Timber structures - Test methods - Cyclic testing of joints made with mechanical fasteners Structures en bois - Mthodes dessai - Essais cycliques dassemblages raliss par organes mcaniques Holzbauwerke - Prfverfahren - Zyklische Prfungen von A
11、nschlssen mit mechanischen Verbindungsmitteln 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 concernin
12、g such national standards may be obtained on application to the 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 langua
13、ge and notified to the Management Centre has the same status as the official versions. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2001 CEN All rights of exploitation in any form and by an
14、y means reserved worldwide for CEN national Members. +A1 September 2005 (includes amendment A1:2005) This European Standard was approved by CEN on 5 October 2001. Amendment No. 1 was approved by CEN on 8 August 2005. (inclut lamendement A1:2005)(enthlt nderung A1:2005) CEN members are the national s
15、tandards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. Ref. No.
16、EN 12512:2001 + A1:2005: E Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 06:30:44 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 12512:2001 (E) 2 Contents page Foreword3 Introduction.4 1Scope5 2Normative references5 3Terms and definitions .5 4Symbols and abbreviations10 5Requirements.10 6Tes
17、t methods .10 6.1Principles.10 6.2Apparatus10 6.3Preparation of the specimens .11 6.3.1Conditioning11 6.3.2Test laboratory11 6.3.3Moisture content .11 6.4Procedures11 6.4.1General .11 6.4.2Complete procedure .11 6.4.3Short procedure12 7Results13 8Test reports13 Licensed Copy: sheffieldun sheffieldun
18、, na, Sat Oct 28 06:30:44 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 12512:2001 (E) 3 Foreword This European Standard has been prepared by Technical Committee CEN/TC 124 “Timber structures“, the secretariat of which is held by DS. This European Standard shall be given the status of a national sta
19、ndard, either by publication of an identical text or by endorsement, at the latest by May 2002, and conflicting national standards shall be withdrawn at the latest by May 2002. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are boun
20、d to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Foreword to amendment A1 This European Standard (EN 12512:2001/A1
21、:2005) has been prepared by Technical Committee CEN/TC 124 “Timber structures”, the secretariat of which is held by SFS. This Amendment to the European Standard EN 12512:2001 shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest
22、 by March 2006, and conflicting national standards shall be withdrawn at the latest by March 2006. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republi
23、c, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 06:30:44 GMT
24、+00:00 2006, Uncontrolled Copy, (c) BSI EN 12512:2001 (E) 4 Introduction Developments in the field of load-bearing engineered timber structures in seismic regions require that joints made with mechanical fasteners be tested to obtain information about their ductility, dissipation of energy and impai
25、rment of strength under cyclic loading. This standard lays down general principles, which should be followed in order to achieve comparability of results from investigations carried out in different laboratories. For different purposes two different testing procedures are considered: a general one,
26、when the determination of the complete cyclic load-slip performance is required (complete procedure), and a particular one when only the determination of the main performances at a pre-determined ductility level is required (short procedure). Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 06
27、:30:44 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 12512:2001 (E) 5 1 Scope This European Standard specifies a test method for determining the ductility, impairment of strength and energy dissipation properties of joints made with mechanical fasteners under cyclic loading. NOTE This standard is wr
28、itten, for uniformity, in terms of direct axial loads and their effects only. The standard is, however, also appropriate to the determination of the moment resisting properties of joints. 2 Normative references This European Standard incorporates by dated or undated reference, provisions from other
29、publications. These normative references are cited at the appropriate places in the text, and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or r
30、evision. For undated references the latest edition of the publication referred to applies (including amendments). EN 26891, Timber structures - Joints made with mechanical fasteners - General principles for the determination of strength and deformation characteristics (ISO 6891:1983). 3 Terms and de
31、finitions For the purposes of this European Standard, the following terms and definitions apply: 3.1 cyclic load alternative load in compression and tension 3.2 maximum load maximum joint load reached during test, Fmax, see Figure 2 3.3 yield load load corresponding to the entry into the plastic ran
32、ge. When the load-slip curve presents two well- defined linear parts, the yield values are determined by the intersection between these two lines (see Figure 1 a). When the load-slip curve does not present two well defined linear parts, the yield values are determined by the intersection of the foll
33、owing two lines: the first line will be determined as that drawn through the point on the load slip curve corresponding to 0,1 Fmax and the point on the load-slip curve corresponding to 0,4 Fmax; the second line is the tangent having an inclination of 1/6 of the first line (see Figure 1 b) 3.4 ultim
34、ate load joint load corresponding to a) failure; or b) 80 % of the maximum load for a slip of less than 30 mm; or c) a joint slip of 30 mm whichever occurs first in the test, see Figure 2 Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 06:30:44 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 12
35、512:2001 (E) 6 3.5 yield slip joint slip corresponding to the yield load, see Figures 1 a) and 1 b) 3.6 ultimate slip joint slip corresponding to the ultimate load, see Figure 2 3.7 ductility ability of the joint to undergo large amplitude slip in the plastic range without a substantial reduction of
36、 strength. It is measured by the ratio between ultimate slip and yield slip, D =Vu/Vy . NOTE The above definitions are intended with reference to envelop load-slip cycle loops curves, but they may also be used for monotonic load-slip curves. 3.8 impairment of strength reduction in the load when atta
37、ining a given joint slip from the first to the third cycle of the same amplitude, see Figure 3: The impairment of strength is measured as ?F where ?F = I?FcI in the compression side and ?F = I?FtI in the tension side 3.9 dissipation of energy property of a joint which, for the purposes of this Europ
38、ean Standard, is measured as the equivalent viscous damping ratio by hysteresis. It is a non-dimensional parameter expressing the hysteresis damping properties of the joint and is measured as the ratio between the dissipated energy in one half cycle and the available potential energy multiplied by 2
39、?, see Figure 4: The equivalent viscous damping ratio is defined as ?eq = Ed/(2? Ep) Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 06:30:44 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 12512:2001 (E) 7 a) Definition of yield values for a load-slip curve with two well-defined linear parts b
40、) Definition of yield values for a load-slip curve without two well-defined linear parts Key FLoad FmaxMaximum load Fy, Yield load VSlip vy, Yield slip Figure 1 - Definition of yield values for a load-sup curve Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 06:30:44 GMT+00:00 2006, Uncontrol
41、led Copy, (c) BSI EN 12512:2001 (E) 8 Key FLoad FmaxMaximum load failure Ca Case a VSlip Figure 2 - Definition of ultimate values. ? ? corresponds to failure slip (case a) or 0,8Fmax. slip (case b) or 30 mm slip (case c) Key V Slip a, b, cCycle t Time c Compression; t Tension Figure 3 - Definition o
42、f impairment of strength Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 06:30:44 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 12512:2001 (E) ! Key Energy dissipated per half cycle, E d Available potential energy, EP“ Figure 4 - Definition of equivalent viscous damping ratio for one cycle Li
43、censed Copy: sheffieldun sheffieldun, na, Sat Oct 28 06:30:44 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 12512:2001 (E) 10 4 Symbols Dductility; Eddissipated energy in newtons millimetres; Epavailable potential energy, in newtons millimetres; Fapplied load, in newtons; Fmaxmaximum load, in newton
44、s; Fuultimate load, in newtons; Fyyield load, in newtons; Vuultimate slip, in millimetres; Vyyield slip, in millimetres; Vy,estestimated yield slip, in millimetres; ?Fimpairment of the strength, in newtons; ?eqequivalent viscous damping ratio. 5 Requirements None. 6 Test methods 6.1 Principles The d
45、uctility, equivalent viscous damping ratio and impairment of the strength of joints are determined under a standardised quasi-static cyclic loading procedure. 6.2 Apparatus In addition to equipment for measuring the geometry of the test specimens and the moisture content the following shall be avail
46、able a) a displacement controlled double effect (tension and compression) testing machine - with an accuracy on the stroke of 1 % or better - with an accuracy on the load of 1 % or better. b) equipment to measure continuously joint slip under load with an accuracy of 1 % or better. Licensed Copy: sh
47、effieldun sheffieldun, na, Sat Oct 28 06:30:44 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 12512:2001 (E) 11 6.3 Preparation of the specimens 6.3.1 General The specimen shall correspond to a joint expected in practice. 6.3.2 Conditioning The tests shall usually be carried out on specimens, which h
48、ave been conditioned at the standard environment of (20 2) C temperature and (65 5) % relative humidity. Further information is given in EN 26891. 6.3.3 Test laboratory The test laboratory should usually be maintained at the standard environment, but when other conditions apply, they shall be report
49、ed. 6.3.4 Moisture content The moisture content of the materials shall be determined. 6.4 Procedures 6.4.1 General The test shall be carried out at a constant rate of slip of between 0,02 mm/s and 0,2 mm/s. Lateral restraint shall be provided to prevent buckling of the specimens. Load and slip shall be measured continuously. 6.4.2 Complete procedure To determine the complete load-slip envelope curve the complete loading procedure as shown in Figure 5, shall be used. License