BS EN 12512-2001 Timber structures - Test methods - Cyclic testing of joints made with mechanical fasteners《木结构 试验方法 机械紧固件接头的周期测试》.pdf

1、BRITISH STANDARDBS EN 12512:2001Incorporating Amendment No. 1Timber structures Test methods Cyclic testing of joints made with mechanical fastenersThe European Standard EN 12512:2001, with the incorporation of amendment A1:2005, has the status of a British StandardICS 21.060.01; 91.080.20g49g50g3g38

2、g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58Licensed Copy: Wang Bin, na, Mon Mar 20 02:50:57 GMT 2006, Uncontrolled Copy, (c) BSIBS EN 12512:2001This Briti

3、sh Standard, having been prepared under the direction of the Building and Civil Engineering Sector Policy and Strategy Committee, was published under the authority of the Standards Policy and Strategy Committee on 5 April 2002 BSI 16 December 2005ISBN 0 580 39461 1National forewordThis British Stand

4、ard 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 indicated in the text by tags !“. Tags indicating changes to CEN text carry the number of the CEN amendment. For example, text altered by

5、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, Test methods, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its s

6、ecretary.Cross-referencesThe British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Cata

7、logue or of British Standards Online.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand th

8、e text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep UK interests informed; monitor related international and European developments and promulgate them in the UK.Summary of pagesThis document comprises a front cove

9、r, 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 when the document was last issued.Amendments issued since publicationAmd. No. Date Comments16045 16 December 2005 See national forewordLicense

10、d Copy: Wang Bin, na, Mon Mar 20 02:50:57 GMT 2006, Uncontrolled Copy, (c) BSIEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORMEN 12512November 2001ICS 21.060.01; 91.080.20English versionTimber structures - Test methods - Cyclic testing of joints made with mechanical fastenersStructures en bois - Mt

11、hodes dessai - Essais cycliques dassemblages raliss par organes mcaniquesHolzbauwerke - Prfverfahren - Zyklische Prfungen von Anschlssen mit mechanischen VerbindungsmittelnCEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this Europea

12、n 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 Management Centre or to any CEN member.This European Standard exists in three official versions (English, Fren

13、ch, 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 Management Centre has the same status as the official versions.EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE

14、 FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2001 CEN All rights of exploitation in any form and by any 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

15、was approved by CEN on 8 August 2005. (inclut lamendement A1:2005) (enthlt nderung A1:2005) CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg,

16、Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. Ref. No. EN 12512:2001 + A1:2005: E Licensed Copy: Wang Bin, na, Mon Mar 20 02:50:57 GMT 2006, Uncontrolled Copy, (c) BSIEN 12512:2001 (E)2ContentspageForeword3Introduction .41 Scope 52 N

17、ormative references53 Terms and definitions .54 Symbols and abbreviations105 Requirements.106 Test methods .106.1 Principles.106.2 Apparatus 106.3 Preparation of the specimens .116.3.1 Conditioning 116.3.2 Test laboratory116.3.3 Moisture content .116.4 Procedures 116.4.1 General .116.4.2 Complete pr

18、ocedure .116.4.3 Short procedure 127 Results138 Test reports13Licensed Copy: Wang Bin, na, Mon Mar 20 02:50:57 GMT 2006, Uncontrolled Copy, (c) BSIEN 12512:2001 (E)3ForewordThis European Standard has been prepared by Technical Committee CEN/TC 124 “Timber structures“, the secretariat of which is hel

19、d by DS.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 May 2002, and conflicting national standards shall be withdrawn at the latest by May 2002.According to the CEN/CENELEC Internal Regulations,

20、 the national standards organizations of the following countries are bound 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 K

21、ingdom.Foreword to amendment A1This European Standard (EN 12512:2001/A1:2005) 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, eith

22、er by publication of an identical text or by endorsement, at the latest 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 im

23、plement this European Standard: 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 Kingd

24、om. Licensed Copy: Wang Bin, na, Mon Mar 20 02:50:57 GMT 2006, Uncontrolled Copy, (c) BSIEN 12512:2001 (E)4IntroductionDevelopments in the field of load-bearing engineered timber structures in seismic regions require thatjoints made with mechanical fasteners be tested to obtain information about the

25、ir ductility, dissipation ofenergy and impairment of strength under cyclic loading.This standard lays down general principles, which should be followed in order to achieve comparability ofresults from investigations carried out in different laboratories.For different purposes two different testing p

26、rocedures are considered: a general one, when thedetermination of the complete cyclic load-slip performance is required (complete procedure), and aparticular one when only the determination of the main performances at a pre-determined ductility levelis required (short procedure).Licensed Copy: Wang

27、Bin, na, Mon Mar 20 02:50:57 GMT 2006, Uncontrolled Copy, (c) BSIEN 12512:2001 (E)51 ScopeThis European Standard specifies a test method for determining the ductility, impairment of strength andenergy dissipation properties of joints made with mechanical fasteners under cyclic loading.NOTE This stan

28、dard is written, 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 referencesThis European Standard incorporates by dated or undated reference, provisions from

29、 other publications.These normative references are cited at the appropriate places in the text, and the publications are listedhereafter. For dated references, subsequent amendments to or revisions of any of these publicationsapply to this European Standard only when incorporated in it by amendment

30、or revision. For undatedreferences the latest edition of the publication referred to applies (including amendments).EN 26891, Timber structures - Joints made with mechanical fasteners - General principlesfor the determination of strength and deformation characteristics (ISO 6891:1983).3 Terms and de

31、finitionsFor the purposes of this European Standard, the following terms and definitions apply:3.1cyclic loadalternative load in compression and tension3.2maximum loadmaximum joint load reached during test, Fmax, see Figure 23.3yield loadload corresponding to the entry into the plastic range. When t

32、he load-slip curve presents two well-defined linear parts, the yield values are determined by the intersection between these two lines (seeFigure 1 a). When the load-slip curve does not present two well defined linear parts, the yield values aredetermined by the intersection of the following two lin

33、es: the first line will be determined as that drawnthrough the point on the load slip curve corresponding to 0,1 Fmaxand the point on the load-slip curvecorresponding to 0,4 Fmax; the second line is the tangent having an inclination of 1/6 of the first line (seeFigure 1 b)3.4ultimate loadjoint load

34、corresponding toa) failure; orb) 80 % of the maximum load for a slip of less than 30 mm; orc) a joint slip of 30 mm whichever occurs first in the test, see Figure 2Licensed Copy: Wang Bin, na, Mon Mar 20 02:50:57 GMT 2006, Uncontrolled Copy, (c) BSIEN 12512:2001 (E)63.5yield slipjoint slip correspon

35、ding to the yield load, see Figures 1 a) and 1 b)3.6ultimate slipjoint slip corresponding to the ultimate load, see Figure 23.7ductilityability of the joint to undergo large amplitude slip in the plastic range without a substantial reduction ofstrength. It is measured by the ratio between ultimate s

36、lip and yield slip,D =Vu/Vy.NOTE The above definitions are intended with reference to envelop load-slip cycle loops curves, but they mayalso be used for monotonic load-slip curves.3.8impairment of strengthreduction in the load when attaining a given joint slip from the first to the third cycle of th

37、e sameamplitude, see Figure 3: The impairment of strength is measured as F where F = I FcI in thecompression side and F = I FtI in the tension side3.9dissipation of energyproperty of a joint which, for the purposes of this European Standard, is measured as the equivalentviscous damping ratio by hyst

38、eresis. It is a non-dimensional parameter expressing the hysteresisdamping properties of the joint and is measured as the ratio between the dissipated energy in one halfcycle and the available potential energy multiplied by 2 , see Figure 4: The equivalent viscous dampingratio is defined as eq= Ed/(

39、2 Ep)Licensed Copy: Wang Bin, na, Mon Mar 20 02:50:57 GMT 2006, Uncontrolled Copy, (c) BSIEN 12512:2001 (E)7a) Definition of yield values for a load-slip curve with two well-defined linear partsb) Definition of yield values for a load-slip curve without two well-defined linear partsKeyF LoadFmaxMaxi

40、mum loadFy,Yield loadV Slipvy, Yield slipFigure 1 - Definition of yield values for a load-sup curveLicensed Copy: Wang Bin, na, Mon Mar 20 02:50:57 GMT 2006, Uncontrolled Copy, (c) BSIEN 12512:2001 (E)8KeyF LoadFmaxMaximum loadfailureCaCase aV SlipFigure 2 - Definition of ultimate values. correspond

41、s to failure slip (case a) or 0,8Fmax. slip (caseb) or 30 mm slip (case c)KeyV Slipa, b, c Cyclet Timec Compression; t TensionFigure 3 - Definition of impairment of strengthLicensed Copy: Wang Bin, na, Mon Mar 20 02:50:57 GMT 2006, Uncontrolled Copy, (c) BSIEN 12512:2001 (E) !Key Energy dissipated p

42、er half cycle, E dAvailable potential energy, EP“Figure 4 - Definition of equivalent viscous damping ratio for one cycleLicensed Copy: Wang Bin, na, Mon Mar 20 02:50:57 GMT 2006, Uncontrolled Copy, (c) BSIEN 12512:2001 (E)104 SymbolsD ductility;Eddissipated energy in newtons millimetres;Epavailable

43、potential energy, in newtons millimetres;F applied load, in newtons;Fmaxmaximum load, in newtons;Fuultimate load, in newtons;Fyyield load, in newtons;Vuultimate slip, in millimetres;Vyyield slip, in millimetres;Vy,estestimated yield slip, in millimetres;F impairment of the strength, in newtons;eqequ

44、ivalent viscous damping ratio.5 RequirementsNone.6 Test methods6.1 PrinciplesThe ductility, equivalent viscous damping ratio and impairment of the strength of joints are determinedunder a standardised quasi-static cyclic loading procedure.6.2 ApparatusIn addition to equipment for measuring the geome

45、try of the test specimens and the moisture content thefollowing shall be availablea) 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

46、joint slip under load with an accuracy of 1 % or better.Licensed Copy: Wang Bin, na, Mon Mar 20 02:50:57 GMT 2006, Uncontrolled Copy, (c) BSIEN 12512:2001 (E)116.3 Preparation of the specimens6.3.1 GeneralThe specimen shall correspond to a joint expected in practice.6.3.2 ConditioningThe tests shall

47、 usually be carried out on specimens, which have been conditioned at the standardenvironment of (20 2) C temperature and (65 5) % relative humidity. Further information is given inEN 26891.6.3.3 Test laboratoryThe test laboratory should usually be maintained at the standard environment, but when oth

48、er conditionsapply, they shall be reported.6.3.4 Moisture contentThe moisture content of the materials shall be determined.6.4 Procedures6.4.1 GeneralThe test shall be carried out at a constant rate of slip of between 0,02 mm/s and 0,2 mm/s. Lateralrestraint shall be provided to prevent buckling of

49、the specimens.Load and slip shall be measured continuously.6.4.2 Complete procedureTo determine the complete load-slip envelope curve the complete loading procedure as shown in Figure5, shall be used.Licensed Copy: Wang Bin, na, Mon Mar 20 02:50:57 GMT 2006, Uncontrolled Copy, (c) BSIEN 12512:2001 (E)12KeyV Slipt TimeFigure 5 - Procedure for cyclic testing (complete procedure)1st cycle:1) apply the load in compression, until a slip of 25 % of the estimated yield slip Vy,estis reached.The value of Vy,estmay be evaluated by calculation, by experience