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1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS EN 1741:1998 The Europ
2、ean Standard EN 1741:1998 has the status of a British Standard ICS 91.100.30 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Determination of shear strength for out-of-plane forces of joints between prefabricated components made of autoclaved aerated concrete or lightweight ag
3、gregate concrete with open structure Licensed Copy: sheffieldun sheffieldun, na, Mon Oct 30 09:19:22 GMT+00:00 2006, Uncontrolled Copy, (c) BSI This British Standard, having been prepared under the direction of the Sector Board for Building and Civil Engineering, was published under the authority of
4、 the Standards Board and comes into effect on 15 September 1998 BSI 1998 ISBN 0 580 30146 X BS EN 1741:1998 Amendments issued since publication Amd. No.DateText affected National foreword This British Standard is the English language version of EN 1741:1998. The UK participation in its preparation w
5、as entrusted to Technical Committee B/523, Prefabricated components of reinforced autoclaved aerated concrete and lightweight aggregated concrete with open structure, which has the responsibility to: aid enquirers to understand the text; present to the responsible European committee any enquiries on
6、 the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Sta
7、ndards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled International Standards Correspondence Index, or by using the Find facility of the BSI Standards Electronic Catalogue. A British Standard
8、does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an i
9、nside front cover, the EN title page, pages 2 to 6, an inside back cover and a back cover. Licensed Copy: sheffieldun sheffieldun, na, Mon Oct 30 09:19:22 GMT+00:00 2006, Uncontrolled Copy, (c) BSI CEN European Committee for Standardization Comite Europe en de Normalisation Europa isches Komitee fu
10、r Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1998 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 1741:1998 E EUROPEAN STANDARDEN 1741 NORME EUROPE ENNE EUROPA ISCHE NORM April 1998 ICS Descriptors: Concrete,
11、cellular concrete, aggregates, reinforcing materials, prefabricated elements, joints, mechanical tests, shear tests, determination, shear strength, test specimen English version Determination of shear strength for out-of-plane forces of joints between prefabricated components made of autoclaved aera
12、ted concrete or lightweight aggregate concrete with open structure De termination de la re sistance au cisaillement des jonctions entre les e le ments pre fabrique s re alise s en be ton cellulaire autoclave ou en be ton de granulats le gers a structure ouverte, sous leffet de forces agissant en deh
13、ors du plan des e le ments Bestimmung der Schubtragfa higkeit von Fugen zwischen vorgefertigten Bauteilen aus dampfgeha rtetem Porenbeton oder haufwerksporigem Leichtbeton bei Belastung rechtwinklig zur Bauteilebene This European Standard was approved by CEN on 25 March 1998. CEN members are bound t
14、o comply 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 Centr
15、al Secretariat 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 Central Secretariat has the same status as t
16、he official versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. Licensed Copy: sheffieldun sheffieldu
17、n, na, Mon Oct 30 09:19:22 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 2 EN 1741:1998 BSI 1998 Foreword This European Standard has been prepared by Technical Committee CEN/TC 177, Prefabricated reinforced components of autoclaved aerated concrete or lightweight aggregate concrete with open struc
18、ture, the secretariat of which is held by DIN. In order to meet the performance requirements as laid down in the product standards for prefabricated components of autoclaved aerated concrete and of lightweight aggregate concrete with open structure, a number of standardized test methods are necessar
19、y. 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 by October 1998, and conflicting national standards shall be withdrawn at the latest by October 1998. According to the CEN/CENELEC Internal Regulati
20、ons, 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, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the Unit
21、ed Kingdom. Contents Page Foreword2 1Scope3 2Normative references3 3Principle3 4Apparatus3 5Test specimens3 5.1Sample3 5.2Shape and size of test specimens3 5.3Number of test specimens3 5.4Preparation of test specimens5 5.5Conditioning of test specimens5 6Testing procedure5 6.1Shear test5 6.2Investig
22、ations after shear test6 7Test results6 8Test report6 Licensed Copy: sheffieldun sheffieldun, na, Mon Oct 30 09:19:22 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 3 EN 1741:1998 BSI 1998 1 Scope This European Standard specifies a method of determining the shear strength for out-of-plane forces of
23、 joints between prefabricated components made of autoclaved aerated concrete (AAC) according to prEN 12602 or lightweight aggregate concrete with open structure (LAC) according to prEN 1520. 2 Normative references This European Standard incorporates by dated or undated reference, provisions from oth
24、er publications. These normative 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 it by amendment o
25、r revision. For undated references the latest edition of the publication referred to applies. EN 678, Determination of dry density of autoclaved aerated concrete. EN 679, Determination of the compressive strength of autoclaved aerated concrete. EN 992, Determination of dry density of lightweight agg
26、regate concrete with open structure. EN 1353, Determination of moisture content of autoclaved aerated concrete. EN 1354, Determination of compressive strength of lightweight aggregate concrete with open structure. EN 1356:1996, Performance test for prefabricated reinforced components made of autocla
27、ved aerated concrete or lightweight aggregate concrete with open structure under transverse load. prEN 1520, Prefabricated components of lightweight aggregate concrete with open structure. prEN 12602, Prefabricated reinforced components of autoclaved aerated concrete. 3 Principle The shear strength
28、of longitudinal joints between prefabricated AAC- or LAC-components for forces acting perpendicular to the plane of the components is determined by applying a vertical line load along the middle-axis on top surface of a horizontally positioned section of a component. The loaded section is supported
29、at both longitudinal edges. At least one of these longitudinal supports consists of an adjacent component section connected to the loaded section by a joint of the type to be tested. The load is increased continuously or in steps until failure of the joint occurs. The test can be carried out without
30、 lateral restraints (case A) or with lateral restraints preventing in-plane displacements normal to the joint (case B). 4 Apparatus a) Saw, for cutting components and test specimens; b) Testing machine or jack, capable of applying a vertical compressive load without shock continuously or in steps. T
31、he precision of the machine or jack and of the load indication shall be such that the failure load can be determined to an accuracy of3 %. The measuring range shall be such that the failure load is higher than one-tenth of the range used; c) Callipers and/or a rule, capable of reading the dimensions
32、 of the test specimens and the joints to an accuracy of 1 mm; d) Devices, according to Figures 1, 2, and 3 for loading and supporting the test specimen; e) Weighing equipment, capable of determining the mass of the sections to an accuracy of 5 kg; f) Steel plates and rollers, according to Figures 1,
33、 2 and 3; g) Device for measuring the relative vertical displacement between the joined sections (optional). 5 Test specimens 5.1 Sample The sample for the preparation of the test specimens shall be taken in such a manner that it is representative of the product to be investigated. In the case of AA
34、C, the direction of rise of the mass during manufacture shall be marked on the components. 5.2 Shape and size of test specimens A test specimen normally consists of an arrangement of three sections taken from prefabricated components with standard width and thickness which shall be joined in the int
35、ended manner (see Figure 1). The length of the sections shall be equal to their width. For certain investigations test specimens consisting of two sections may be used (see Figures 2 and 3). 5.3 Number of test specimens A test set shall consist of at least three test specimens, each normally made of
36、 three sections taken from the same component (see Figure 1). When testing an asymmetric joint between two sections, two test sets with different arrangements of the sections with respect to loading and supports shall be carried out (see Figures 2 and 3). Licensed Copy: sheffieldun sheffieldun, na,
37、Mon Oct 30 09:19:22 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 4 EN 1741:1998 BSI 1998 a = b 2 2h $ 100 mm is the maximum permitted gap g is the maximum permitted gap 1 2 3 Support frame Moveable support rollers Upper supports 4 5 6 Lateral supports (only in case B) Load distribution beam Soft
38、fibreboard or equalizing layer Figure 1 Arrangement of standard shear test a = b 2 2h $ 100 mm 1 2 3 Support frame Moveable support rollers Upper supports 4 5 6 Lateral supports (only in case B) Load distribution beam Soft fibreboard or equalizing layer Figure 2 Arrangement of one-sided shear test (
39、type 1) Licensed Copy: sheffieldun sheffieldun, na, Mon Oct 30 09:19:22 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 5 EN 1741:1998 BSI 1998 1 2 3 Support frame Moveable support rollers Upper supports 4 5 6 Lateral supports (only in case B) Load distribution beam Soft fibreboard or equalizing lay
40、er Figure 3 Arrangement of one-sided shear test (type 2) 5.4 Preparation of test specimens AAC components shall be allowed to cool for at least 2 d after autoclaving before being assembled. LAC components shall be at least 21 d old before being assembled and at least 28 d at testing. The sections sh
41、all be cut to length from the components by means of a saw. Before jointing, length, thickness, and width of the sections shall be measured. The shape and dimensions of the longitudinal faces adjacent to the joint (e.g. tongue and groove) shall also be determined. If the components or sections are f
42、rozen or cold, they shall be stored with sufficient space between each other at room temperature for at least 2 d before jointing. The sections shall then be arranged on a support frame according to Figure 1, 2 or 3. Each support consists of a roller with a diameter of 20 mm or more and a steel plat
43、e between the roller and the section. The supports shall extend over the full length of the test specimen. The steel plates shall have a width of (502) mm and a thickness of at least 10 mm. The section on which the load is applied shall be weighed prior to being jointed. The gap between the assemble
44、d sections shall have the maximum width permitted by the manufacturer. If a dry jointing system is used (e.g. tongue and groove joint), the sections shall be simply laid together without additional fixing. In the case of joints to be grouted with mortar or concrete, the sections shall be placed in p
45、osition and fixed temporarily together in at least two places before grouting. After hardening of the grouting material the restraint shall be removed. Grouting shall be performed according to the instructions of the manufacturer of the components. The grouting procedure (including e.g. any prewetti
46、ng of the concrete adjacent to the joint), the recipe, consistency, and the temperature of the grouting material shall be recorded in the test report. A grouted joint shall be protected against moisture loss under plastic foil immediately after grouting and cured at room temperature for at least 7 d
47、 before the test. 5.5 Conditioning of test specimens The test specimens shall be kept at room temperature before and during testing. The mass-related moisture content of the concrete at testing shall be at least 10 % for AAC and at least 5 % for LAC. This shall be checked after the shear test (see 6
48、.2). NOTEWhen in doubt about the moisture content, this can be estimated in advance by testing related samples of material. 6 Testing procedure 6.1 Shear test The load shall be applied as line load acting in a vertical direction parallel to the joints and along the longitudinal axis of the section t
49、o be loaded. It shall be uniformly distributed over the whole length of the test specimen and have a width equal to the width of the loaded section less twice its thickness, but not less than 100 mm, by means of a distribution beam and an intermediate layer of soft fibre board. Licensed Copy: sheffieldun sheffieldun, na, Mon Oct 30 09:19:22 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 6 EN 1741:1998 BSI 1998 The load shall be applied continuously or in steps until failure of a joint. In the case of incremental loading, the size of t
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