1、BRITISH STANDARD BS EN 846-4:2002 Incorporating Amendment No.1 Methods of test for ancillary components for masonry Part 4: Determination of load capacity and load-deflection characteristics of straps The European Standard EN 846-4:2001, with the incorporation of amendment A1:2004, has the status of
2、 a British Standard ICS 91.100.99 BS EN 846-4:2002 This British Standard, having been prepared under the direction of the Building and Civil Engineering Sector Policy Committee was published under the authority of the Standards Policy and Strategy Committee on 31 January 2002 BSI 27 February 2005 IS
3、BN 0 580 38986 3 National foreword This British Standard is the official English language version of EN 846-4:2001, including amendment A1:2004. EN 846-4 is a supporting standard to the forthcoming “harmonized” European product standard specifications on ancillary components for masonry, EN 845-1. T
4、hese standards are the subject of transitional arrangements agreed under the Commission mandate. The Member States have agreed a nominal transition period for the co-existence of these standards and their corresponding national stanard(s). It is intended that this period will comprise a nominal nine
5、 month period during which any required changes to national regulations are to be made, followed by a further nominal twelve month period for the implementation of CE marking. At the end of this co-existence period, the national standard(s) will be withdrawn. In the UK there are no corresponding nat
6、ional standards to EN 846-4. The UK participation in its preparation was entrusted by Technical Committee B/519, Masonry and associated testing, to Subcommittee B/519/3, Ancillary components, which has the responsibility to: A list of organizations represented on this subcommittee can be obtained on
7、 request to its secretary. Cross-references The 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
8、BSI Electronic Catalogue 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 enqui
9、rers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This docu
10、ment comprises a front cover, an inside front cover, the EN title page, pages 2 to 17 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date Comments 15526 27 February 2005 Changes to 7.2 an
11、d Clause 8EUROPEAN STANDARD EN 846-4 NORME EUROPENNE November 2001 EUROPISCHE NORM + A1 October 2004 CEN EUROPEAN COMMITTEE FOR STANDARDIZATION COMITE EUROPEN DE NORMALISATION EUROPAISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart 36, B - 1050 Brussels 2001 CEN - All rights of exploitati
12、on in any form and by any means reserved worldwide for CEN national members. Ref. No. EN 846-4:2001 + A1:2004 E ICS 91.080.30 English version Methods of test for ancillary components for masonry Part 4: Determination of load capacity and load-deflection characteristics of straps (includes amendment
13、A1:2004) Mthodes dessai des composants accessoires de maonnerie Partie 4: Dtermination de la rsistance et de la rigidit des brides de fixation (inclut lamendement A1:2004) Prfverfahren fr Ergnzungsbauteile fr Mauerwerk Teil 4: Bestimmung der Festigkeit und Last-Verformungs- Eigenschaften von Bndern
14、(enthlt nderung A1:2004) This European Standard was approved by CEN on 13 October 2001. CEN members are bound to comply with the CEN/CENELEC Internatal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date li
15、sts 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, French, German). A version in any other language made by translation under the respon
16、sibility of a CENELEC member into its own language and notified to the Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Irel
17、and, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EN 846-4:2001 (E) 2 Contents page Foreword 3 Introduction 4 1 Scope 5 2 Normative references . 5 3 Principle . 6 4 Materials. 6 5 Apparatus . 7
18、6 Test specimens . 10 7 Procedure 16 8 Test report 17 EN 846-4:2001 (E) 3 Foreword This European Standard 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 publica
19、tion of an identical text or by endorsement, at the latest by May 2002, and conflicting national standards shall be withdrawn at the latest by March 2004. This European Standard follows initial preparation by Working Group 4 “Test methods“, taking into account the proposals submitted by Task Group 4
20、 “Tests for ancillary components“. According to the CEN/CENELEC Internal Regulations, 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, L
21、uxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Foreword to amendment A1 This document (EN 846-4:2001/A1:2004) has been prepared by Technical Committee CEN/TC 125 “Masonry“, the secretariat of which is held by BSI. This European Standard shall be given th
22、e status of a national standard, either by publication of an identical text or by endorsement, at the latest by April 2005, and conflicting national standards shall be withdrawn at the latest by July 2006. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the
23、 following countries are bound to implement 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,
24、Sweden, Switzerland and the United Kingdom. EN 846-4:2001 (E) 4 Introduction Straps are used in buildings to provide horizontal and vertical restraint for floor and roof constructions against wind pressure and uplift forces. EN 846-4:2001 (E) 5 1 Scope This European Standard specifies methods for de
25、termining the load capacity and load-deflection characteristics of restraint straps fixed to timber joists, rafters and timber wall plates and masonry walls. 2 Normative references This European Standard incorporates by dated or undated reference, provisions from other publications. These normative
26、references are cited at the appropriate places in the text, and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in by amendments or revision. For undated references
27、the latest edition of the publication referred to applied (including amendments). EN 336, Structural timber Coniferous and poplar Sizes, permissible deviations. EN 338, Structural timber - Strength classes. EN 845-1, Specification for ancillary components for masonry - Part 1: Ties, tension straps,
28、hangars and brackets. prEN 772-1, Methods of test for masonry units - Part 1: Determination of compressive strength. prEN 772-10, Methods of test for masonry units - Part 10: Determination of moisture content of calcium silicate and autoclaved aerated concrete units. prEN 998-2, Specification for mo
29、rtar 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
30、or mortar for masonry - Part 11: Determination of flexural and compressive strength of hardened mortar. EN 846-4:2001 (E) 6 3 Principle Straps are fixed to masonry walls, timber joists or rafters or to other floor/roof materials and loaded in a manner representative of their intended use. 4 Material
31、s 4.1 Masonry units 4.1.1 Sampling All of the masonry units for individual tests and for making the masonry specimens shall be taken from the same consignment. 4.1.2 Conditioning of the units The conditioning of masonry units shall be as specified: Record the method of conditioning the units prior t
32、o laying. Record the age of non autoclaved concrete units at the time of testing the strap specimens. Measure the moisture content by mass of autoclaved aerated concrete and calcium silicate masonry units in accordance with prEN 772-10. 4.1.3 Testing Determine the compressive strength of a sample of
33、 masonry units using the method given in prEN 772-1. For non-autoclaved concrete units, determine the compressive strength at the time of testing the strap specimens. NOTE Where the strength of the masonry units will change with time, the compressive strength test should be carried out on the same d
34、ay as the test. 4.2 Mortar The mortar, its mixing procedure and its flow value shall be as specified and conform with the requirements of prEN 998-2, unless otherwise specified and these shall be reported in the test report. Take samples of mortar from the masons board to make mortar specimens and d
35、etermine the flow value of fresh mortar in accordance with EN 1015-3, the air-content of the fresh mortar in accordance with EN 1015-7 and the compressive strength of mortar in accordance with EN 1015-11 at the time of testing the masonry specimens. 4.3 Timber Timber sections shall be of coniferous
36、timber as specified in accordance with strength class C16 of EN 338 and a moisture content of not greater than 18 % by mass. EN 846-4:2001 (E) 7 4.4 Fixings Fixings shall be as specified by the manufacturer, in a clean dry uncontaminated state. 5 Apparatus A device for clamping and applying axial te
37、nsile force to the strap. A typical arrangement is described below and is shown in Figure 1. The end of the strap to be loaded (1) is placed inside the strap connector (2) comprising a cylindrical steel bar, which has a slot (7) cut up its centre. Each connector or connector and associated packing p
38、ieces should be specially made to fit the strap to be tested: holes are drilled along its length with the same hole spacing and pattern as that of the strap. The strap is held in the connector by a number of bolts that pass through the strap and screw into the connector. The test load is applied axi
39、ally to the strap through the bar. Alternatively a hydraulic clamp device may be suitable. Load is applied to the strap by means of a hydraulic ram or screw (4), which reacts against a reaction frame (9), and is connected via a load cell (8) to the strap connector. The load measuring system (11) sha
40、ll comprise a load cell device having a digital or analogue readout with a resolution of 2 % of the full scale reading or better. A typical arrangement for measuring movement of the strap is shown in Figure 2. EN 846-4:2001 (E) 8 15.66 1 1 2 3 4 5 6 7 8 9 10 11 12Key 1 Strap 2 Strap connector 3 Pist
41、on 4 Hydraulic cylinder 5 Fixing screw 6 ELEVATION 7 Specially made slot 8 Load cell 9 Reaction frame 10 PLAN 11 Voltmeter or recording device 12 Hydraulic pump Figure 1 - Device for clamping and applying axial force to the strap EN 846-4:2001 (E) 9 1 2 3 4 5 6 7 8 9Key 1 Load spreader 2 Strap 3 Tra
42、nsducer 4 Strap connector 5 Specimen 6 Transducer 7 PLAN 8 Transducer mounting plate 9 Tension force Figure 2 - Deflection measuring arrangement EN 846-4:2001 (E) 10 6 Test specimens 6.1 Sampling Five specimens of straps shall be sampled for each test format in accordance with EN 845-1. Sufficient s
43、pecimens shall be set aside for determining compliance with specifications of materials. Prior to building in or fixing the straps, all relevant dimensions and thickness shall be measured and recorded. 6.2 Horizontal restraint strap : Timber specimen A panel approximately 1 m x 1,2 m is fabricated c
44、onsisting of three timber ceiling joists of 47 mm x 147 mm timber in accordance with EN 336. with spacing noggins between them made with the same timber, nailed together as shown in Figure 3. The strap shall be connected to this element in accordance with the manufacturers instructions. The specimen
45、 shall be restrained from rotation. EN 846-4:2001 (E) 11 Dimensions in millimetres 147 47 1.2 m 1m 1 2 3 4 4 4 5 6 7 7 8 9 10Key 1 Anti-rotation reaction 2 Typical strap fixing nail or screw positions 3 SIDE ELEVATION 4 Noggin 5 Ceiling joist 6 Reaction frame 7 Reaction 8 Tension force 9 Packing pie
46、ce 10 PLAN Figure 3 - Timber specimen for horizontal restraint strap EN 846-4:2001 (E) 12 6.3 Horizontal restraint strap : Masonry specimens Build the walls on a flat horizontal surface. Build the strap into the centre of the wall or otherwise fix in accordance with manufacturers instructions. A typ
47、ical specimen is shown in Figure 4. Strike off the mortar flush with the faces of the specimen. Normal 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. Take appropriate steps to prevent the test specimen from drying out durin
48、g the first 3 days after construction (e.g. by covering the polythene sheets) and then leave uncovered in a laboratory environment until tested. Unless otherwise specified, leave to cure for a least 28 days before testing. EN 846-4:2001 (E) 13 Dimensions in millimetres 1125 1125 100 1 2 3 3 3 4 5 6
49、7 8 8 9 10 11Key 1 Simulated dead load 2 Load spreader 3 Reaction points 4 Strap 5 Tension loading force 6 Wall 7 END ELEVATION 8 Reaction point 9 PLAN 10 ELEVATION 11 Frame Figure 4 - Typical block wall specimen with built-in strap installed EN 846-4:2001 (E) 14 6.4 Vertical restraint strap : Timber wall plate or truss specimen The specimen consists of a panel of masonry and a wallplate as shown in Figure 5. Mount the fixings into the side of the wall
