DIN EN 846-14-2012 Methods of test for ancillary components for masonry - Part 14 Determination of the initial shear strength between the prefabricated part of a composite lintel a.pdf

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1、November 2012 Translation by DIN-Sprachendienst.English price group 11No part of this translation 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).I

2、CS 91.080.30!$QG“1924636www.din.deDDIN EN 846-14Methods of test for ancillary components for masonry Part 14: Determination of the initial shear strength between theprefabricated part of a composite lintel and the masonry above it;English version EN 846-14:2012,English translation of DIN EN 846-14:2

3、012-11Prfverfahren fr Ergnzungsbauteile fr Mauerwerk Teil 14: Bestimmung der Anfangsscherfestigkeit des Verbunds zwischen demvorgefertigten Teil eines teilweise vorgefertigten, bauseits ergnzten Sturzes und dember dem Sturz befindlichen Mauerwerk;Englische Fassung EN 846-14:2012,Englische bersetzung

4、 von DIN EN 846-14:2012-11Mthodes dessai des composants accessoires de maonnerie Partie 14: Dtermination de la rsistance initiale au cisaillement entre la partieprfabrique dun linteau composite et de la maonnerie place au-dessus;Version anglaise EN 846-14:2012,Traduction anglaise de DIN EN 846-14:20

5、12-11www.beuth.deIn case of doubt, the German-language original shall be considered authoritative.Document comprises 19 pages 10.12 DIN EN 846-14:2012-11 2 A comma is used as the decimal marker. National foreword This standard has been prepared by Technical Committee CEN/TC 125 “Masonry” (Secretaria

6、t: BSI, United Kingdom). The responsible German body involved in its preparation was the Normenausschuss Bauwesen (Building and Civil Engineering Standards Committee), Working Committee NA 005-06-04 AA Prfverfahren (SpA zu CEN/TC 125/WG 4). EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 846-14

7、 September 2012 ICS 91.080.30 English Version Methods of test for ancillary components for masonry - Part 14: Determination of the initial shear strength between the prefabricated part of a composite lintel and the masonry above itMthodes dessai des composants accessoires de maonnerie - Partie 14: D

8、termination de la rsistance initiale au cisaillement entre la partie prfabrique dun linteau composite et de la maonnerie place au-dessus Prfverfahren fr Ergnzungsbauteile fr Mauerwerk - Teil14: Bestimmung der Anfangsscherfestigkeit des Verbunds zwischen dem vorgefertigten Teil eines teilweise vorgef

9、ertigten, bauseits ergnzten Sturzes und dem ber dem Sturz befindlichen Mauerwerk This European Standard was approved by CEN on 11 February 2012. 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

10、national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member. This European Standard exists in three official versions (English, French, German). A

11、 version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cypr

12、us, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kin

13、gdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2012 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 846-14:2012: EEN 8

14、46-14:2012 (E) 2 Contents Page Foreword . 31 Scope 42 Normative references . 43 Principle . 44 Terms, definitions and symbols 54.1 Terms and definitions . 54.2 Symbols . 55 Materials . 65.1 Masonry units 65.1.1 Conditioning of the units 65.1.2 Testing 65.2 Mortar . 65.3 Prefabricated part of the com

15、posite lintel 66 Apparatus . 67 Preparation and curing of specimens . 77.1 Preparation of masonry specimen 77.2 Curing and conditioning of the specimens 88 Procedure 88.1 Placing the specimens in the testing machine . 88.2 Loading 108.2.1 Procedure A . 108.2.2 Procedure B . 108.2.3 Loading rate . 10

16、8.3 Measurements and observations 118.4 Replications . 119 Calculations . 1110 Evaluation of results . 1210.1 Procedure A . 1210.2 Procedure B . 1210.2.1 General . 1210.2.2 Simple method 1210.2.3 Statistical method . 1311 Test report . 14Annex A (informative) Types of failure . 15Bibliography . 17DI

17、N EN 846-14:2012-11 EN 846-14:2012 (E) 3 Foreword This document (EN 846-14:2012) has been prepared by Technical Committee CEN/TC 125 “Masonry”, the secretariat of which is held by BSI. This European Standard shall be given the status of a national standard, either by publication of an identical text

18、 or by endorsement, at the latest by March 2013, and conflicting national standards shall be withdrawn at the latest by March 2013. 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 held responsible f

19、or identifying any or all such patent rights. According to the CEN/CENELEC Internal Regulations, the national standards organisations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Form

20、er Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. DIN EN 846-14:2012-11 EN 846-14:2012 (E)

21、4 1 Scope This European Standard specifies a method for determining the in plane initial shear strength of the horizontal bed joint between the prefabricated part of a composite lintel and the masonry above it, using a specimen tested in shear. Guidance is given on the preparation of the specimens,

22、the conditioning required before testing, the testing machine, the method of test, the method of calculation and the contents of the test report. The method corresponds with the method described in EN 1052-3:2003+A1:2006. Guidance is given where the method deviates from EN 1052-3. Therefore, each se

23、ction of EN 1052-3 is repeated given the necessary changes. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the la

24、test edition of the referenced document (including any amendments) applies. EN 772-1, Methods of test for masonry units Part 1: Determination of compressive strength EN 772-10, Methods of test for masonry units Part 10: Determination of moisture content of calcium silicate and autoclaved aerated con

25、crete units EN 772-16, Methods of test for masonry units Part 16: Determination of dimensions EN 998-2, Specification for mortar for masonry Part 2: Masonry mortar EN 1015-3, Methods of test for mortar for masonry Part 3: Determination of consistence of fresh mortars (by flow table) EN 1015-7, Metho

26、ds of test for mortar for masonry Part 7: Determination of air content of fresh mortar EN 1015-11, Methods of test for mortar for masonry Part 11: Determination of flexural and compressive strength of hardened mortar 3 Principle The initial shear strength of the horizontal bed joint between the pref

27、abricated part of a composite lintel and the masonry above it is derived from the strength of small specimens tested 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. Proce

28、dure A involves testing specimens at different precompressions and the initial shear strength is defined by a linear 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 statistica

29、l consideration of the results. DIN EN 846-14:2012-11 EN 846-14:2012 (E) 5 4 Terms, definitions and symbols 4.1 Terms and definitions For the purpose of this European Standard, the following terms and definitions apply. 4.1.1 masonry assemblage of masonry units laid in a specified pattern and jointe

30、d together with mortar 4.1.2 shear strength of masonry strength of masonry subjected to shear forces 4.2 Symbols Aiis the gross cross-sectional area of a specimen parallel to the bed joints, in mm2 E distance between centre lines of the mortar bed and the loading roller, in mm fv0iis the shear stren

31、gth of an individual sample, in N/mm2 fpiis the precompressive stress of an individual sample, in N/mm2 fv0is the mean initial shear strength, in N/mm2 fvk0,clis the characteristic initial shear strength, in N/mm2 F is the representation of the force applied to the specimen, in N Fi,maxis the maximu

32、m shear load, in N Fpiis the precompressive force, in N h1and h2are the heights of cut units, in mm huis the height of the units according to EN 772-16, in mm hppclis the height of the part of the prefabricated composite lintel according to EN 772-16, in mmk is a function of n given in Table 3 lsis

33、the length of specimen, in mm luis the length of the units according to EN 772-16, in mm n is the number of samples s is the standard deviation of the n log values tbjis the thickness of the bed joint, in mm tsis the thickness of the steel loading plates, in mm Y is log10of the initial shear strengt

34、h, fv0Ycis the characteristic value of the log10 of the individual samples Yiis log10of the shear strength of the individual samples Ymeanis the mean of the log10of the shear strength of the individual samples DIN EN 846-14:2012-11 EN 846-14:2012 (E) 6 5 Materials 5.1 Masonry units 5.1.1 Conditionin

35、g of the units The conditioning of masonry units shall be as specified: Record the method of conditioning the masonry units prior to laying. Measure the moisture content by mass of autoclaved aerated concrete and calcium silicate units in accordance with EN 772-10. Record the age of non-autoclaved c

36、oncrete units at the time of testing the masonry specimens. 5.1.2 Testing Determine the compressive strength of a sample of masonry units, using the test method given in EN 772-1. For non-autoclaved concrete units determine the compressive strength at the time of testing the masonry specimens. 5.2 M

37、ortar The mortar, its mixing procedure and its flow value shall conform with the requirements of EN 998-2, unless otherwise specified, and these shall be reported in the test report. Take representative samples of fresh mortar from the masons board to make mortar prism specimens, to determine the fl

38、ow value in accordance with EN 1015-3 and to determine the air content in accordance with EN 1015-7. Use the prism specimens to determine the mean compressive strength at the time of testing the masonry specimens in accordance with EN 1015-11. 5.3 Prefabricated part of the composite lintel Condition

39、ing of the prefabricated part of the composite lintels The conditioning of the lintel shall be as specified after cutting. Record the method of conditioning the prefabricated part of the composite lintels prior to laying. 6 Apparatus The testing machines used to apply the shear loads and precompress

40、ion shall comply with the requirements given in Table 1. The testing machine to apply the shear loads shall have adequate capacity but the scale used shall be such that the ultimate load on the specimen exceeds one fifth of the full scale reading. The machine shall be provided with a load pacer or e

41、quivalent means to enable the load to be applied at the rate specified. Table 1 Requirements for testing machines Maximum permissible repeatability of forces as percentage of indicated force Maximum permissible mean error of forces as percentage of indicated force Maximum permissible error of zero f

42、orce as percentage of maximum force of range 2,0 2,0 0,4 DIN EN 846-14:2012-11 EN 846-14:2012 (E) 7 6.1 Apparatus capable of measuring the cross sectional area of the specimens to an accuracy of 1 %. 7 Preparation and curing of specimens 7.1 Preparation of masonry specimen Prepare specimens, accordi

43、ng Table 2 and Figure 1. If hu 200 mm, type II specimens may be used. The bottom parts consist of a piece of the prefabricated part of the composite lintels with the intended upper bed face towards the mortar joints. Where for practical purposes it is necessary to cut units, ensure that the faces of

44、 the unit to be mortared are representative of the unit as a whole. The length ls of the piece of the prefabricated part of the composite lintel shall correspond with the length of the masonry unit lu 300 mm. Type I Type II Key 1 Piece of prefabricated part of composite lintel 2 Masonry unit Possibl

45、e saw cuts Figure 1 Dimensions of shear test specimens DIN EN 846-14:2012-11 EN 846-14:2012 (E) 8 Table 2 Dimensions and type of shear test specimens Unit length Specimen type and dimensions luType according to Figure 1 Dimensions mm mm 300 I ls = lu 300 I 300 300 II hu 200 300 ls 350 Record the met

46、hod of conditioning the prefabricated part of the composite lintels prior to laying. Build the specimens within 30 min after completion of the conditioning of the units. Use mortar mixed not more than 1 h beforehand unless it is designed to be used over a more prolonged period. The bearing surfaces

47、of the masonry units shall be wiped clean of any adherent dust. The lower piece of the prefabricated part of the composite lintel shall be laid on a clean level surface. The masonry unit shall be laid so that a final mortar joint thickness of 8 mm to 15 mm, representative of masonry with conventiona

48、l 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 and spirit level. Excess mortar shall then be struck off with a trowel. The procedure for the masonry unit shall be repeated for the top piece of the prefabricated part of the composite lintel. The intended bonding faces