BS EN 1052-3-2002 Methods of test for nmasonry — nPart 3 Determination of initial nshear strength《砖石工程的试验方法 起始剪切强度的测定》.pdf

1、BRITISH STANDARD BS EN 1052-3:2002 Incorporating amendment no. 1 Methods of test for masonry Part 3: Determination of initial shear strength The European Standard EN 1052-3:2002, incorporating amendment A1:2007, has the status of a British Standard ICS 91.080.30 BS EN 1052-3:2002 This British Standa

2、rd was published under the authority of the Standards Policy and Strategy Committee on 13 August 2002 BSI 2007 ISBN 978 0 580 60355 6 National foreword This British Standard is the UK implementation of EN 1052-3:2002, incorporating amendment A1:2007. The start and finish of text introduced or altere

3、d by 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 CEN amendment A1 is indicated by !“. The UK participation in its preparation was entrusted by Technical Committee B/519, Masonry and associated

4、tests, to Subcommittee B/519/4, Tests. A list of organizations represented on this subcommittee can be obtained on request to its secretary. EN 1052-3:2002 is a supporting standard to the “harmonized” European product standard specification EN 998-2, which fully takes into account the requirements o

5、f the European Commission mandate M116, Masonry and related products, given under the EU Construction Products Directive (89/106/EEC), and is intended to lead to CE marking. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct

6、 application. Compliance with a British Standard cannot confer immunity from legal obligations. Amendments issued since publication Amd. No. Date Comments 17263 30 November 2007 See national forewordEUROPEANSTANDARD NORMEEUROPENNE EUROPISCHENORM EN10523 July2002 ICS91.080.30 Englishversion Methodsof

7、testformasonryPart3:Determinationofinitial shearstrength MthodesdessaidelamaonneriePartie3: Dterminationdelarsistanceinitialeaucisaillement PrfverfahrenfrMauerwerkTeil3:Bestimmungder Anfangsscherfestigkeit(Haftscherfestigkeit) ThisEuropeanStandardwasapprovedbyCENon11April2002. CENmembersareboundtoco

8、mplywiththeCEN/CENELECInternalRegulationswhichstipulatetheconditionsforgivingthisEurope an Standardthestatusofanationalstandardwithoutanyalteration.Uptodatelistsandbibliographicalreferencesconcernings uchnational standardsmaybeobtainedonapplicationtotheManagementCentreortoanyCENmember. ThisEuropeanS

9、tandardexistsinthreeofficialversions(English,French,German).Aversioninanyotherlanguagemadebytra nslation undertheresponsibilityofaCENmemberintoitsownlanguageandnotifiedtotheManagementCentrehasthesamestatusasthe official versions. CENmembersarethenationalstandardsbodiesofAustria,Belgium,CzechRepublic

10、,Denmark,Finland,France,Germany,Greece, Iceland,Ireland,Italy,Luxembourg,Malta,Netherlands,Norway,Portugal,Spain,Sweden,SwitzerlandandUnitedKingdom. EUROPEANCOMMITTEEFORSTANDARDIZATION COMITEUROPENDENORMALISATION EUROPISCHESKOMITEEFRNORMUNG ManagementCentre:ruedeStassart,36B1050Brussels 2002CEN Allr

11、ightsofexploitationinanyformandbyanymeansreserved worldwideforCENnationalMembers. Ref.No.EN10523:2002E +A1 March2007EN10523:2002(E) 2 Contents page Foreword 3 1Scope .4 2Normativereferences. 4 3Principle 4 4Terms,definitionsandsymbols. 5 5Materials 6 6Apparatus 6 7Preparationandcuringofspecimens .7

12、8Procedure .8 9Calculations. 11 10Evaluationofresults. .11 AnnexA(informative)Typesoffailure 14 Bibliography.15 11Testreport .13EN10523:2002(E) 3 Foreword ThisdocumentEN10523:2002hasbeenpreparedbyTechnicalCommitteeCEN/TC 125“Masonry“,the secretariatofwhichisheldbyBSI. ThisEuropeanStandardshallbegive

13、nthestatusofanationalstandard,eitherbypublicationofan identicaltextorbyendorsement,atthelatestbyJanuary2003,andconflictingnationalstandardsshallbe withdrawnatthelatestbyJanuary2003. AnnexAofthisEuropeanStandardisinformative. AccordingtotheCEN/CENELECInternalRegulations,thenationalstandardsorganizati

14、onsofthe followingcountriesareboundtoimplementthisEuropeanStandard:Austria,Belgium,CzechRepublic, Denmark,Finland,France,Germany,Greece,Iceland,Ireland,Italy,Luxembourg,Malta,Netherlands, Norway,Portugal,Spain,Sweden,SwitzerlandandtheUnitedKingdom. ForewordtoamendmentA1 This document (EN 1052-3:2002

15、/A1:2007) has been prepared by Technical Committee CEN/TC 125 “Masonry”, the secretariat of which is held by BSI. This Amendment to the European Standard EN 1052-3:2002 shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by Se

16、ptember 2007, and conflicting national standards shall be withdrawn at the latest by September 2007. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, C

17、zech 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. EN10523:2002(E) 4 1Scope ThisEuropeanStandards

18、pecifiesamethodfordeterminingtheinplaneinitialshearstrengthofhorizontal bedjointsinmasonryusingaspecimentestedinshear. Guidanceisgivenonthepreparationofthespecimens,theconditioningrequiredbeforetesting,thetesting machine,themethodoftest,themethodofcalculationandthecontentsofthetestreport. 2Normative

19、references ThisEuropeanStandardincorporatesbydatedorundatedreference,provisionsfromotherpublications. Thesenormativereferencesarecitedattheappropriateplacesinthetext,andthepublicationsarelisted hereafter.Fordatedreferences,subsequentamendmentstoorrevisionsofanyofthesepublicationsapplyto thisEuropean

20、Standardonlywhenincorporatedinitbyamendmentorrevision.Forundatedreferencesthe latesteditionofthepublicationreferredtoapplies(includingamendments). EN7721, MethodsoftestformasonryunitsPart1:Determinationofcompressivestrength. EN77210, MethodsoftestformasonryunitsPart10:Determinationofmoisturecontento

21、fcalcium silicateandautoclavedaeratedconcreteunits. EN77216, MethodsoftestformasonryunitsPart16:Determinationofdimensions. EN9982, SpecificationformortarformasonryPart2:Masonrymortar. EN10153, MethodsoftestformortarformasonryPart3:Determinationofconsistenceoffreshmortars (byflowtable). EN10157, Meth

22、odsoftestformortarformasonryPart7:Determinationofaircontentoffreshmortar. EN101511, MethodsoftestformortarformasonryPart11:Determinationofflexuralandcompressive strengthofhardenedmortar. 3Principle !The initial shear strength of masonry is derived from the strength of small masonry specimens tested

23、to destruction. The specimens are tested in shear under four-point load. Four different failure modes are considered to give valid results. Two procedures, A and B are included. Procedure A involves testing specimens at different precompressions and the initial shear strength is defined by a linear

24、regression curve to zero prestress. Procedure B involves testing specimens at zero precompression and determining a characteristic initial shear strength from a simple or a statistical consideration of the results. “ EN10523:2002(E) 5 4Terms,definitionsandsymbols 4.1Termsanddefinitions Forthepurpose

25、ofthisEuropeanStandard,thefollowingtermsanddefinitionsapply. 4.1.1 masonry assemblageofmasonryunitslaidinaspecifiedpatternandjointedtogetherwithmortar 4.1.2 shearstrengthofmasonry strengthofmasonrysubjectedtoshearforces 4.2Symbols A i isthecrosssectionalareaofaspecimenparalleltothebedjoints,insquare

26、millimetres(mm 2 ) e distancebetweencentrelinesofthemortarbedandtheloadingroller,inmillimetres(mm) f voi istheshearstrengthofanindividualsample,inNewtonpersquaremillimetres(N/mm 2 ) f pi istheprecompressivestressofanindividualsample,inNewtonpersquaremillimetres (N/mm 2 ) f vo isthemeaninitialshearst

27、rength,inNewtonpersquaremillimetres(N/mm 2 ) f vko isthecharacteristicinitialshearstrength,inNewtonpersquaremillimetres(N/mm 2 ) F istherepresentationoftheforceappliedtothespecimen,inNewton(N) F i,max isthemaximumshearload,inNewton(N) F pi istheprecompressiveforce,inNewton(N) h 1 and h 2 aretheheigh

28、tsofcutunits,inmillimetres(mm) h u istheheightoftheunitsaccordingto EN77216 ,inmillimetres(mm) l s isthelengthofspecimen,inmillimetres(mm) l u isthelengthoftheunitsaccordingto EN77216, in millimetres (mm) t bj isthethicknessofthebedjoint,inmillimetresinmillimetres(mm) t s isthethicknessofthesteelloa

29、dingplates,inmillimetres(mm) a istheangleofinternalfriction,indegrees a k isthecharacteristicangleofinternalfriction,indegreesEN10523:2002(E) 6 5Materials 5.1Masonryunits 5.1.1Conditioningoftheunits Theconditioningofmasonryunitsshallbeasspecified: Recordthemethodofconditioningthemasonryunitspriortol

30、aying.Measurethemoisturecontentby massofautoclavedaeratedconcreteandcalciumsilicateunitsinaccordancewithEN77210.Recordthe ageofnonautoclavedconcreteunitsatthetimeoftestingthemasonryspecimens. 5.1.2Testing Determinethecompressivestrengthofasampleofmasonryunits,usingthetestmethodgivenin EN7721.Fornona

31、utoclavedconcreteunitsdeterminethecompressivestrengthatthetimeoftestingthe masonryspecimens. 5.2Mortar Themortar,itsmixingprocedureanditsflowvalueshallconformwiththerequirementsof EN9982,unlessotherwisespecified,andtheseshallbereportedinthetestreport. Takerepresentativesamplesoffreshmortarfromthemas

32、onsboardtomakemortarprismspecimens,to determinetheflowvalueinaccordancewithEN10153andtodeterminetheaircontentinaccordancewith EN10157.Usetheprismspecimenstodeterminethemeancompressivestrengthatthetimeoftestingthe masonryspecimensinaccordancewithEN101511. 6Apparatus Thetestingmachinesusedtoapplythesh

33、earloadsandprecompressionshallcomplywiththerequirements giveninTable1. Thetestingmachinetoapplytheshearloadsshallhaveadequatecapacitybutthescaleusedshallbesuch thattheultimateloadonthespecimenexceedsonefifthofthefullscalereading.Themachineshallbe providedwithaloadpacerorequivalentmeanstoenabletheloa

34、dtobeappliedattheratespecified. Table1Requirementsfortestingmachines Maximumpermissible repeatabilityofforcesas percentageofindicated force Maximumpermissiblemean errorofforcesaspercentage ofindicatedforce Maximumpermissibleerror ofzeroforceaspercentageof maximumforceofrange 2,0 2,0 0,4 Apparatus ca

35、pableofmeasuringthecrosssectionalareaofthespecimenstoanaccuracyof1%.EN10523:2002(E) 7 7Preparationandcuringofspecimens 7.1Preparationofmasonryspecimens h u h 1 h 2 l s l s t bj t bj t bj h 2 h 1 t bj = ( - )/2 Key Possiblesawcuts Figure1Dimensionsofsheartestspecimen !Prepare type I specimens accordi

36、ng to Table 2 and Figure 1. If h u 200 mm, type II specimens may be used. Where for practical purposes it is necessary to cut units, ensure that the faces of the unit to be mortared are representative of the unit as a whole. “ !Type I Type II “ ! Table 2 - Dimensions and type of shear test specimens

37、 Unit length Specimen type and dimensions l u mm Type according to Figure 1 Dimensions mm 300 I l s= l u 300 I 300 300 II h 1 = 200 300 l s 350“ EN10523:2002(E) 8 Buildthespecimenswithin30minaftercompletionoftheconditioningoftheunits.Usemortarmixednot morethan1hbeforehandunlessitisdesignedtobeusedov

38、eramoreprolongedperiod. 7.2Curingandconditioningofthespecimens Immediatelyafterbuilding,precompresseachspecimenbyanuniformlydistributedmasstogiveavertical stressbetween2,0 10 3 N/mm 2 and5,0 10 3 N/mm 2 .Thencurethespecimensandmaintainthem undisturbeduntiltesting.Forotherthanlimebasedmortars,prevent

39、thetestspecimensfromdryingout duringthecuringperiodbyclosecoveringwithpolyethylenesheet,andmaintainthespecimensundisturbed untiltesting,unlessotherwisespecified.Testeachspecimenatanageof28d1d,unlessotherwise specifiedforlimebasedmortars,anddeterminethecompressivestrengthofthemortaratthesameage follo

40、wingEN101511. 8Procedure 8.1Placingthespecimensinthetestingmachine Applytheloadthroughaballhingeplacedinthecentreofthetopcentralsteelplate. The bearing surfaces of the masonry units shall be wiped clean of any adherent dust. The lower unit shall be laid on a clean level surface. The next unit shall

41、be laid so that a final mortar joint thickness of 8 mm to 15 mm, representative of masonry with conventional mortar joints, or of 1 mm to 3 mm, representative of masonry with thin layer mortar joints, is attained. The masonry unit shall be checked for linear alignment and level using a set-square an

42、d spirit level. Excess mortar shall then be struck off with a trowel. !In the case of Type I specimens according to Figure 1, “ the procedure for the second unit shall be repeated for the top unit. Support the end units of each specimen in the test apparatus in accordance with Figure 2. For this, us

43、e pieces of steel at least 12 mm thick, with an appropriate capping if necessary, to ensure good contact. The diameter of the roller bearings shall be 12 mm with a length of at least !the width of the unit. “ EN10523:2002(E) 9 t s l s t s t s l s t s t s F t s F ee e e e e bj 2 12 12 t s 12 mm 20 mm

44、 V V 2 2 1 h +t +2e bj 2 h +t -2e Key 1 Sawcut 2 Roller,fixedorpositivelylocated Figure2Loadingofsheartestspecimen Figure3Precompressionload !Type I Type II “ = s 15 l e !1 2 2 F 3 d 2x x xKey 1 Strawboard/softboard/gypsum plaster 2 Precompression 3 Loading beam d depth of loading beam x length by which the loading beam extends beyond the end of the platen “EN10523:2002(E) 10 8.2Loading Testatleastthreespecimensateachofthreeprecompressionloads.Forunitswithcompressivestrengths greaterthan10N/mm 2 ,useprecompressionloadsthatgiveapproximately0,2N/mm 2 ,0,6N/mm 2 and 1,