01438357 PDF BRITISH STANDARD BS EN 1737 1998 Determination of shear strength of welded joints of reinforcement mats or cages for prefabricated components made of autoclaved aerated concrete or lightw[.]
BRITISH STANDARD Determination of shear strength of welded joints of reinforcement mats or cages for prefabricated components made of autoclaved aerated concrete or lightweight aggregate concrete with open structure The European Standard EN 1737:1998 has the status of a British Standard ICS 91.100.30 BS EN 1737:1998 BS EN 1737:1998 National foreword This British Standard is the English language version of EN 1737:1998 The UK participation in its preparation was 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 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 Standards 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 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 inside front cover, pages i and ii, the EN title page, pages to and a back cover This standard has been updated (see copyright date) and may have had amendments incorporated This will be indicated in the amendment table on the inside front cover This British Standard, having been prepared under the direction of the Sector Board for Building and Civil Engineering, was published under the authority of the Standards Board and comes into effect on 15 November 1998 © BSI 05-1999 ISBN 580 30100 Amendments issued since publication Amd No Date Comments BS EN 1737:1998 Contents National foreword Foreword Text of EN 1737 © BSI 05-1999 Page Inside front cover i ii blank EUROPEAN STANDARD EN 1737 NORME EUROPÉENNE April 1998 EUROPÄISCHE NORM ICS Descriptors: Concrete, cellular concrete, aggregates, reinforcing materials, prefabricated elements, welded wire lattice, mechanical tests, shear tests, determination, shear strength, test specimen English version Determination of shear strength of welded joints of reinforcement mats or cages for prefabricated components made of autoclaved aerated concrete or lightweight aggregate concrete with open structure Détermination de la résistance au cisaillement des jonctions soudées des treillis ou corbeilles d’armatures pour les éléments préfabriqués réalisés en béton cellulaire autoclavé ou en béton de granulats légers structure ouverte Bestimmung der Bruchscherkraft von Schweißknoten von Betonstahlmatten oder Bewehrungskưrben für vorgefertigte Bauteile aus dampfgehärtetem Porenbeton oder haufwerksporigem Leichtbeton This European Standard was approved by CEN on 25 March 1998 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 without any alteration Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central 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 the 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 CEN European Committee for Standardization Comité Européen de Normalisation Europäisches Komitee für 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 1737:1998 E EN 1737:1998 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 structure, 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 necessary 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 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, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom Contents Foreword Scope Normative references Principle Apparatus Test specimens Testing procedure Test results Test report Figure — Typical device for testing shear strength of welded joints Figure — Typical auxiliary device for testing of joints with a diagonal bar Figure — Shape and dimensions of test specimens with welded transverse bars Figure — Shape and dimensions of test specimens with welded diagonal bars Page 3 3 4 6 © BSI 05-1999 EN 1737:1998 Scope This European Standard specifies a method of determining the shear strength of welded joints in reinforcements intended for use in prefabricated components made of autoclaved aerated concrete (AAC) according to prEN 12602 or lightweight aggregate concrete with open structure (LAC) according to prEN 1520 Normative references This European Standard incorporates by dated or undated reference, provisions from other 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 or revision For undated references the latest edition of the publication referred to applies prEN 1520, Prefabricated components of lightweight aggregate concrete with open structure prEN 12602, Prefabricated reinforced components of autoclaved aerated concrete Principle The shear strength of welded joints is determined on test specimens consisting of a longitudinal bar and a welded transverse bar or diagonal bar In the case of welded joints, where the transverse bar forms an angle of 90° with the longitudinal bar, the test load is applied as a tensile force on the free end of the longitudinal bar, while the welded transverse bar is supported by a device designed to minimize influence from bending and twisting forces (see note 1) When joints with a diagonal bar are tested, the test load is applied to the free end of the diagonal bar while the longitudinal bar is supported (see note 2) The test load is increased at a uniform rate until failure of the weld, and the ultimate force is recorded NOTE In AAC- and LAC-components transverse bars are predominantly used for anchorage of longitudinal bars, therefore the tensile force which can be transmitted from the longitudinal bar to the transverse bar, is of main interest NOTE Diagonal bars are mainly used as shear reinforcement In this case, the welded joint should be able to transmit the tensile force of the diagonal bar to the longitudinal bar Apparatus a) a device for cutting reinforcement without influence on the welded joints; © BSI 05-1999 b) calipers, capable of measuring the diameter of the reinforcing bars and the dimension of the welded joint to an accuracy of 0,1 mm; c) a tensile testing machine having a load capacity of at least 20 kN, capable of measuring the load to an accuracy of %; for routine control purposes machines with lower accuracy may be used, provided the actual accuracy is taken into consideration when evaluating the test results d) a device capable of holding the test specimen in such a way that the non-tensioned bar is firmly supported and prevented from bending and twisting as far as possible The free end of the tensioned bar shall be supported against bending in such a way, that the measured force is not increased by friction (see note) NOTE A typical device is shown in Figure An auxiliary for testing welded joints with angles other than 90° between the bars is shown in Figure Test specimens 5.1 Sample The sample for the preparation of the test specimens (usually reinforcement mats or cages) shall be taken in such a manner that it is representative of the entire output of the welding equipment used for the manufacture of the prefabricated components The sampling shall be adjusted to the type of welding machine used if any knowledge exists The sample shall include welded joints from every longitudinal bar and from different transverse (or diagonal) bars in sufficient number to satisfy the requirements in 5.3 5.2 Shape and size of test specimens The test specimen consists of a longitudinal bar and a welded transverse bar or diagonal bar with dimensions according to Figure or Figure 4, respectively, if possible If test specimens with other shapes or sizes are used, this shall be indicated in the test report 5.3 Number of test specimens A test set shall include at least one test specimen from each longitudinal bar, but not less than three test specimens 5.4 Preparation of test specimens Test specimens shall be cut in such a manner as to avoid damage to the welds Burrs and other irregularities should be removed from the bar ends 5.5 Measurement of test specimens The diameter of both bars shall be measured to an accuracy of 0,1 mm, using calipers EN 1737:1998 5.6 Conditioning of test specimens The test specimens shall be in equilibrium with a room temperature between (10 – 30) °C when being tested Testing procedure The test specimen shall be centred in the testing device so that the axis of the bar to be tensioned coincides with the axis of the device The supported welded bar shall be held in a way that bending as well as twisting is prevented The tension force shall be applied on the bar to be anchored by the welded bar in the prefabricated component Normally the longitudinal bar shall be loaded However, when testing the welded joint between a longitudinal bar and a bar used for shear reinforcement, the tensile force shall be applied on the latter The free end of the tensioned bar shall be supported in a way (e.g by means of rollers) that friction does not influence the test result The load shall be applied at a uniform rate so that the stress increase in the tensioned bar does not exceed N/mm2·s The load shall be increased until failure of the welded joint or of the bar In both cases this load shall be indicated as failure load Test results The shear strength is defined as the ultimate shear force which is equivalent to the ultimate tensile force in the tensioned bar The individual values and the mean value shall be rounded to the nearest 0,1 kN Figure — Typical device for testing shear strength of welded joints © BSI 05-1999 EN 1737:1998 Figure — Typical auxiliary device for testing of joints with a diagonal bar © BSI 05-1999 EN 1737:1998 Test report Figure — Shape and dimensions of test specimens with welded transverse bars The test report shall include the following: a) identification of the product; b) date of manufacture or other code; c) place and date of testing, testing institute and person responsible for testing; d) number and date of issue of this European Standard; e) identification of welding procedure; f) type of weld; g) angle between the bars; h) nominal diameter of both bars; i) indication on which of the two bars the test load has been applied; j) type of steel (plain smooth or ribbed, steel quality if available); k) measured diameters of both bars of all test specimens and (optional) overall thickness of the welded joint; l) shear strength of individual test specimens and mean value; m) failure mode (only for failure outside the welded joint); n) observed inclusions, impurities or other irregularities; o) (if appropriate) deviations from the standard method of testing; p) a declaration that the testing has been carried out in accordance with this European Standard except as detailed in o) If available, the following information (e.g collected at inspection of welding equipment) shall be added: q) type of welding machine; r) number of welding guns when more than one; s) settings: — welding time; — current intensity; — cooling time; — electrode pressure; t) position of weld in the reinforcement mat or cage (drawing) Figure — Shape and dimensions of test specimens with welded diagonal bars © BSI 05-1999 blank BS EN 1737:1998 BSI — British Standards Institution BSI is the independent national body responsible for preparing British Standards It presents the UK view on standards in Europe and at the international level It is incorporated by Royal Charter Revisions British Standards are updated by amendment or revision Users of British Standards should make sure that they possess the latest amendments or editions It is the constant aim of BSI to improve the quality of our products and 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