1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN 846-7:2012Methods of test for ancillarycomponents for masonryPart 7: Determination of shear load capacityand load displacement characteristics ofshear ties and slip ties (c
2、ouplet test formortar joint connections)BS EN 846-7:2012 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN 846-7:2012. Itsupersedes BS EN 846-7:2000 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee B/519/3, Ancillary c
3、omponents.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2012. Published by BS
4、I StandardsLimited 2012ISBN 978 0 580 69587 2ICS 91.080.30Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 August 2012.Amendments issued since publicationDate Te
5、xt affectedBS EN 846-7:2012EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 846-7 August 2012 ICS 91.080.30 Supersedes EN 846-7:2000English Version Methods of test for ancillary components for masonry - Part 7: Determination of shear load capacity and load displacement characteristics of shear t
6、ies and slip ties (couplet test for mortar joint connections) Mthodes dessai des composants accessoires de maonnerie - Partie 7: Dtermination de la charge admissible au cisaillement et des caractristiques effort-dformation des attaches rsistant au cisaillement et des attaches de glissement (essai da
7、ns un joint de mortier entre deux lments) Prfverfahren fr Ergnzungsbauteile fr Mauerwerk - Teil 7: Bestimmung der Schubtragfhigkeit und der Steifigkeit von Mauerverbindern (Steinpaar-Prfung in Mrtelfugen) This European Standard was approved by CEN on 11 February 2012. CEN members are bound to comply
8、 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 be obtained on application to the CEN-CENELEC M
9、anagement 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-CENELEC Management Centre has the same
10、 status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg,
11、Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2012 CEN All rig
12、hts of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 846-7:2012: EBS EN 846-7:2012EN 846-7:2012 (E) 2 Contents Page Foreword 31 Scope. 42 Normative references 43 Principle 44 Materials 54.1 Masonry units . 54.1.1 Sampling and conditioning . 54.1.2
13、 Testing. 54.2 Mortar 54.3 Ties 55 Apparatus . 56 Preparation and storage of test specimens 76.1 General 76.2 Preparation . 76.3 Storage 87 Procedure . 87.1 Setting specimen in test machine 87.2 Test environment . 87.3 Loading . 88 Expression of results. 89 Test report 9BS EN 846-7:2012EN 846-7:2012
14、 (E) 3 Foreword This document (EN 846-7:2012) 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 or by endorsement, at the latest b
15、y February 2013, and conflicting national standards shall be withdrawn at the latest by February 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 for identifying any or all suc
16、h patent rights. This document supersedes EN 846-7:2000. There are no major changes from the previous edition although the curing period for the different types of mortar has been clarified. According to the CEN/CENELEC Internal Regulations, the national standards organisations of the following coun
17、tries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Po
18、land, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. BS EN 846-7:2012EN 846-7:2012 (E) 4 1 Scope This European Standard specifies the couplet method for determining the horizontal and vertical shear load resistance and load-deflection behaviour of s
19、hear ties and slip ties embedded in mortar joints. The test is intended for ties for connecting together two leaves of masonry forming a collar jointed wall or two walls at right angles. It also applies to ties used for connecting the edges of infill panel walls to frames which encircle them. 2 Norm
20、ative 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 latest edition of the referenced document (including any amendments)
21、 applies. EN 771-1, Specification for masonry units Part 1: Clay masonry units EN 771-2, Specification for masonry units Part 2: Calcium silicate masonry units EN 771-3, Specification for masonry units Part 3: Aggregate concrete masonry units (Dense and lightweight aggregates) EN 771-4, Specificatio
22、n for masonry units Part 4: Autoclaved aerated concrete masonry units EN 771-5, Specification for masonry units Part 5: Manufactured stone masonry units EN 771-6, Specification for masonry units Part 6: Natural stone masonry units EN 772-1, Methods of test for masonry units Part 1: Determination of
23、compressive strength EN 772-10, Methods of test for masonry units Part 10: Determination of moisture content of calcium silicate and autoclaved aerated concrete units EN 845-1, Specification for ancillary components for masonry Part 1: Ties, tension straps, hangers and brackets EN 998-2, Specificati
24、on 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 mortar (by flow table) EN 1015-7, Methods of test for mortar for masonry Part 7: Determination of air content of fresh mortar EN 1015-11, Methods of test f
25、or mortar for masonry Part 11: Determination of flexural and compressive strength of hardened mortar 3 Principle One end of the tie is embedded in a mortar joint, typical of the type for which the tie is specified, between a pair (couplet) of typical masonry units. The tie is then clamped at its fre
26、e end and subjected to shear against a reactive support for the couplet. Slip ties may be tested by the same method. NOTE The method measures the capacity of the tie alone and does not measure the contribution to the total shear resistance given by two masonry faces separated by a vertical mortar jo
27、int. This value should be obtained by wallette tests if required. BS EN 846-7:2012EN 846-7:2012 (E) 5 4 Materials 4.1 Masonry units 4.1.1 Sampling and conditioning Masonry units shall be as specified. All of the masonry units for individual tests or for making the couplet specimens shall be taken fr
28、om the same consignment. Masonry units shall be in an air dried condition, unless otherwise specified. 4.1.2 Testing Determine the compressive strength of a sample of masonry units using the method given in EN 772-1. For non-autoclaved concrete units, determine the compressive strength at the time o
29、f testing the couplet specimens. Measure the moisture content by mass of AAC or Calcium silicate units in accordance with EN 772-10. For other types of units, record the method of conditioning prior to laying. 4.2 Mortar The mortar, its mixing procedure and its flow value shall conform with the requ
30、irements 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 flow value in accordance with EN 1015-3 and the air content in accordance with EN 1015-7
31、. Use the prism specimens to determine the mean compressive strength at the time of testing of the couplet specimens in accordance with EN 1015-11. 4.3 Ties The method of sampling shall be in accordance with EN 845-1. The minimum number of specimens shall be 10 for each direction of test, but this n
32、umber shall be doubled where both ends of asymmetrical ties are tested separately. 5 Apparatus 5.1 A means of applying and maintaining a constant compressive stress of 0,1 N/mm2 0,01 N/mm2on the couplet simulating the restraint within a masonry wall. A possible device is shown in Figures 1 and 2. 5.
33、2 A clamp for gripping the free end of the tie and applying a load. Typical clamps are shown in Figures 1 and 2. NOTE Clamping failures will invalidate the deformation measurement and therefore specially designed clamps or packing pieces may be needed for particular tie forms. The use of low melting
34、 point alloys to act as chucks is recommended for complex pressings. Some frame ties will require special clamps to deal with the nailing/screwing tab. 5.3 A test machine capable of applying the load without distortion such that the maximum load reading occurs above 20 % of the full-scale reading. T
35、he load shall be measured using a load cell device having a digital or analogue readout with a maximum error of 2 % of the full-scale reading. The device shall apply a shear force to the specimen. The upper platen of the universal test machine shall be fitted with a rigidly connected pillar and clam
36、p which is used to apply the load to the tie end as depicted in Figures 1 and 2. The couplet specimen within the pre-stressing clamp shall bear on the lower platen of the test machine and the support shall be extended through the main axis of the test BS EN 846-7:2012EN 846-7:2012 (E) 6 machine to p
37、revent any rotation of the couplet assembly. This will necessitate a restraint clamp for the horizontal test arrangement (Figure 1). Figure 1 shows the assembly arranged for a horizontal shear test and Figure 2 for vertical shear. 5.4 A means of measuring displacement of the couplet in relation to t
38、he clamp using a dial gauge or electrical linear displacement transducer as shown in Figures 1 and 2. Displacement shall be measured to the nearest 0,01 mm. Displacement shall be measured between the tie end clamp and the unit forming one half of the couplet. Displacement shall not be measured by re
39、cording the cross-head travel of the test machine. 5.5 For polymer-based (plastic) fixing components only, a controlled temperature and humidity chamber or room which may be a chamber which fits over the specimen. (X) Side elevation of couplet in test machine (Y) End elevation of couplet in test mac
40、hine (Z) End elevation of clamping device (XX) Side elevation of couplet Key 1 Test machine upper platen 10 Load cell 2 Test machine lower platen 11 Tie 3 Upper unit 12 Tie clamp 4 Lower unit 13 Deflection gauge 5 Mortar joint 14 Packing around tie in clamp 6 Upper couplet clamp 15 Loading pillar 7
41、Lower couplet clamp 16 Specimen support device 8 Packing material 17 Anti-rotation restraint clamp 9 Load spring Figure 1 Typical apparatus for testing horizontal shear resistance of ties (shown for brick-sized couplets) BS EN 846-7:2012EN 846-7:2012 (E) 7 (X) Side elevation of couplet in test machi
42、ne (Y) End elevation of couplet in test machine (Z) End elevation of clamping device Key 1 Test machine upper platen 9 Load spring 2 Test machine lower platen 10 Load cell 3 Upper unit 11 Tie 4 Lower unit 12 Tie clamp 5 Mortar joint 13 Deflection gauge 6 Upper couplet clamp 14 packing around tie in
43、clamp device 7 Lower couplet clamp 15 loading pillar 8 Packing material Figure 2 Typical apparatus for testing vertical shear resistance of ties (shown for block-sized couplets) 6 Preparation and storage of test specimens 6.1 General Ten ties each shall be tested in either horizontal or vertical she
44、ar as required by EN 845-1. In the case of asymmetric ties where both ends are intended to be bedded into masonry for each type of tie and ten ties shall be tested in either horizontal shear or vertical shear as required by EN 845-1. 6.2 Preparation Build the specimens on a flat horizontal surface,
45、and lay the tie or pairs of ties in the bed joints between two masonry units by normal bricklaying techniques, using a jig to ensure axial alignment of each tie. The tie shall be embedded to the intended design depth either directly in the mortar (shear tie) or in a sleeve if provided (slip tie). Al
46、ign the two stretcher faces to give a plane surface. Strike off the mortar flush with the faces of the specimen. General purpose and lightweight masonry mortar joints shall be between 8 mm and 15 mm thick. Thin layer mortar joints shall be between 1 mm and 3 mm thick. BS EN 846-7:2012EN 846-7:2012 (
47、E) 8 Two ties may be laid in large masonry units but if a splitting failure occurs in the first test, the specimen shall be discarded. Only one tie shall be laid in couplets less than 250 mm in length. Record the position of the ties in relation to any perforations, frogs or other depressions of the
48、 bed face of the units. 6.3 Storage Take appropriate steps to prevent the test specimen from drying out during the first three days after construction, e.g. by covering with polyethylene sheets, and then leave uncovered in a laboratory environment until tested. Store specimens incorporating plastic
49、fixing components at 32,5 2,5 C immediately prior to the test. Use a curing period of 7 days for thin layer mortar and 28 days for general purpose mortar. 7 Procedure 7.1 Setting specimen in test machine At the end of the curing period load the specimens into the test system or test machine such that the couplet and precompression assembly lies flat on the bottom platen of the test machine with the tie protruding. The clamping post should be attached rigidly to the top platen of the machin
