BS EN 846-5-2012 Methods of test for ancillary components for masonry Determination of tensile and compressive load capacity and load displacement characteristics of wall ties (cou.pdf

1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN 846-5:2012Methods of test for ancillarycomponents for masonryPart 5: Determination of tensile andcompressive load capacity and loaddisplacement characteristics of wall ties

2、(couplet test)BS EN 846-5:2012 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN 846-5:2012. Itsupersedes BS EN 846-5:2000 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee B/519/3, Ancillary components.A list of organi

3、zations 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 BSI StandardsLimited 2012ISB

4、N 978 0 580 69585 8ICS 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 Text affectedBS EN 846-5:201

5、2EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 846-5 August 2012 ICS 91.080.30 Supersedes EN 846-5:2000English Version Methods of test for ancillary components for masonry - Part 5: Determination of tensile and compressive load capacity and load displacement characteristics of wall ties (coup

6、let test) Mthodes dessai des composants accessoires de maonnerie - Partie 5: Dtermination de la charge admissible la traction et la compression, et des caractristiques effort-dformation des attaches murales Prfverfahren fr Ergnzunsbauteile fr Mauerwerk - Teil 5: Bestimmung der Zug- und Drucktragfhig

7、keit sowie der Steifigkeit von Mauerankern (steinpaar-Prfung) 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 national standard w

8、ithout 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 version in any oth

9、er 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, Cyprus, Czech Republic,

10、 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 Kingdom. EUROPEAN COMM

11、ITTEE 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 846-5:2012: EBS EN 846-5:2012EN 846-5

12、: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 Testing 54.2 Mortar . 54.3 Wall ties 55 Apparatus 56 Preparation and storage of test specimens . 66.1 General . 66.2 Preparation 66.3 Lengt

13、h of embedment of ties in mortar beds . 76.4 Storage . 77 Procedure 77.1 Setting specimen in test machine . 77.2 Test environment 77.3 Loading 78 Expression of results 89 Test report . 8BS EN 846-5:2012EN 846-5:2012 (E) 3 Foreword This document (EN 846-5:2012) has been prepared by Technical Committe

14、e 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 February 2013, and conflicting national standards shall be withdrawn at the latest by

15、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 such patent rights. This document supersedes EN 846-5:2000. The principal changes in this d

16、ocument form the previous edition relate to the tie position, the number of ties to be tested, the location of the clamp during testing and the treatment of slope and movement tolerant ties. Ties are to now be placed at the minimum declared embedment length rather than a length calculated from the t

17、ie length and design cavity width. Ten ties are tested in tension and ten in compression. In the compression tests the ties are loaded over an extended cavity, or alternatively provision is made for evaluating the cavity section by calculation. Where ties are designed to tolerate either an induced s

18、lope or movement then prior to test they are cycled fifty times through the slope or movement for which they have been designed. According to the CEN/CENELEC Internal Regulations, the national standards organisations of the following countries are bound to implement this European Standard: Austria,

19、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, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Sw

20、itzerland, Turkey and the United Kingdom. BS EN 846-5:2012EN 846-5:2012 (E) 4 1 Scope This European Standard specifies the couplet method for determining the tensile and compressive load capacity and load displacement characteristics of wall ties embedded in mortar joints. The test is intended for t

21、ies used for connecting together two leaves of masonry and for the mortar-bedded end of ties for connecting masonry leaves to other structures. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application.

22、For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 771-1, Specification for masonry units Part 1: Clay masonry units EN 771-2, Specification for masonry units Part 2: Calcium silicate maso

23、nry units EN 771-3, Specification for masonry units Part 3: Aggregate concrete masonry units (Dense and lightweight aggregates) EN 771-4, Specification for masonry units Part 4: Autoclaved aerated concrete masonry units EN 771-5, Specification for masonry units Part 5: Manufactured stone masonry uni

24、ts 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 compressive strength EN 772-10, Methods of test for masonry units Part 10: Determination of moisture content of calcium silicate and autoclaved aerate

25、d concrete units EN 845-1, Specification for ancillary components for masonry Part 1: Wall ties, tension straps, hangers and brackets 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

26、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 for mortar for masonry Part 11: Determination of flexural and compressive strength of hardened mortar 3 Principle The tie is embedded in a mortar

27、typical of the type for which the tie is specified between a pair (couplet) of masonry units. The tie is then subjected to tension or compression until failure occurs. BS EN 846-5:2012EN 846-5:2012 (E) 5 4 Materials 4.1 Masonry units 4.1.1 Sampling and conditioning Masonry units shall be as specifie

28、d in accordance with EN 771. All of the masonry units for individual tests or for making the couplet specimens shall be taken from the same consignment. The conditioning of masonry units shall be as specified. Record the method of conditioning the masonry units prior to laying. Measure the moisture

29、content by mass of autoclaved aerated concrete and calcium silicate units in accordance with EN 772-10. Record the age of non-autoclaved concrete units at the time of testing the masonry specimens. 4.1.2 Testing Determine the compressive strength of a sample of masonry units using the method given i

30、n EN 772-1. For non-autoclaved concrete units, determine the compressive strength at the time of testing the couplet specimens. 4.2 Mortar The mortar, its mixing procedure and its flow value shall conform to the requirements of EN 998-2, unless otherwise specified and these shall be reported in the

31、test report. Take representative samples of fresh mortar from the masons board to make mortar prisms to determine the flow 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

32、 of testing of the masonry specimens in accordance with EN 1015-11. 4.3 Wall ties The method of sampling shall be in accordance with EN 845-1. The minimum number of specimens shall be 20, but this number shall be doubled where both ends of asymmetrical ties are tested separately. 5 Apparatus 5.1 A s

33、imple support for the couplet specimen so that the reaction (e.g. hardwood bearer-see Figure 4) is no closer to the centre line of the tie than 75 mm. The support system shall not apply any restraint against splitting of the specimen, apart from the friction generated at the reaction due to the appl

34、ied load. A possible arrangement is shown in Figure 4 for tension and in Figure 4 for compression. In cases where slope tolerant ties are required to be tested at their maximum design slope the load should be applied to the tie end via a rigid loading assembly and the support arrangement should allo

35、w the specimen to be offset from the machine axis by the specified offset distance. BS EN 846-5:2012EN 846-5:2012 (E) 6 5.2 A means of applying and maintaining a constant compressive stress of 0,1 N/mm2 0,01 N/mm2on the couplet. A possible device is shown in Figure 2. NOTE The device is optional whe

36、re ultimate failure does not occur by splitting apart of the couplet. 5.3 A clamp for gripping the free end of the tie and applying a load. Typical clamps are shown in Figure 3. NOTE Movement of the specimen within the clamp will invalidate the deformation measurement and therefore specially designe

37、d clamps may be needed for particular tie forms. The use of low melting point alloys to act as chucks is recommended. Some frame ties will require special clamps. 5.4 A test machine capable of applying the load without distortion such that the maximum load reading occurs above 20 % of the full scale

38、 reading. The 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 system shall apply an axial force to the specimen. The system or universal test machine shall be fitted with a rigid connection between the cl

39、amp which is used to apply tension or compression loads and the machine cross-head or loading device, i.e. any pivot ball joint or universal joint connections to the load cells shall be locked. 5.5 A means of measuring displacement of the couplet in relation to the clamp using at least two symmetric

40、ally placed dial gauges or electrical linear displacement transducers as shown in Figure 1. Displacement shall be measured to the nearest 0,01 mm. Displacement shall not be measured by recording the cross-head travel of the test machine. 5.6 For polymer-based (plastics) products only, a controlled t

41、emperature and humidity chamber or room which may be a chamber which fits over the specimen. 6 Preparation and storage of test specimens 6.1 General Ten couplet specimens each for compression and tensile testing shall be prepared with the ties embedded to the declared minimum embedment length. The n

42、umber of specimens for each shall be doubled where both ends of asymmetrical ties are tested separately. 6.2 Preparation Build the specimens on a flat horizontal surface, and lay the ties in the bed joints between two masonry units by normal bricklaying techniques, using a jig to ensure axial alignm

43、ent of each tie. A typical jig is shown in Figure 4. Align the two stretcher faces to be used for reaction 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 mort

44、ar joints shall be between 1 mm and 3 mm thick. Record the position of the ties in relation to any perforations, frogs or other depressions of the bed face of the units. Deviations from axiallity of the tie in a couplet is liable to reduce its measured strength. This effect may be assessed by measur

45、ing the compressive strength of offset ties in a suitable test machine. BS EN 846-5:2012EN 846-5:2012 (E) 7 6.3 Length of embedment of ties in mortar beds For symmetrical ties, physically identical at each end and designed or intended to be used in mortar at each end, the length of embedment shall b

46、e the declared minimum embedment length. For asymmetrical ties either of a different physical design at each end or designed or used in different materials at each end, the length of embedment shall be the declared minimum embedment length for each end. In each case, record the length of mortar beyo

47、nd the embedment length. 6.4 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. Use a curing period of 7 days for thi

48、n layer mortars and 28 days for general purpose mortars. 7 Procedure 7.1 Setting specimen in test machine At the end of the curing period: a) Load the specimens into the test system or test machine such that the tie body is axial and aligned at the centre of the test machine where no movement tolera

49、nce or slope tolerance is specified for the particular tie system; or b) In cases where slope tolerant or movement tolerant ties are required to be tested offset one end of the specimen over a distance which gives the maximum slope or half the maximum movement specified by the manufacturer and repeat this in both directions fifty times. After this offset one end of the specimen from the centre of action of the test machine or test system by a distance which gives the maximum slope or half the m