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 lightweight aggr.pdf

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1、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 lightweight aggregate concrete with open structure The European Standard EN 1737:1998 has the status of a British Stand

2、ard ICS 91.100.30BSEN1737:1998 This British Standard, having been prepared under the directionof the Sector Board for Building and Civil Engineering, was published under the authorityof the Standards Boardand comes into effect on 15 November 1998 BSI 05-1999 ISBN 0 580 30100 1 National foreword This

3、 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 responsibil

4、ity 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

5、 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 Corre

6、spondence 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 no

7、t of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, theEN title page, pages 2 to 6 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will

8、be indicated in the amendment table on the inside front cover. Amendments issued since publication Amd. No. Date CommentsBSEN1737:1998 BSI 05-1999 i Contents Page National foreword Inside front cover Foreword 2 Text of EN 1737 3ii blankEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 1737 April

9、1998 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 cag

10、es for prefabricated componentsmade of autoclaved aerated concrete orlightweight aggregate concrete with open structure Dtermination de la rsistance au cisaillement des jonctions soudes des treillis ou corbeilles darmatures pour les lments prfabriqus raliss en bton cellulaire autoclav ou en bton de

11、granulats lgers structure ouverte Bestimmung der Bruchscherkraft von Schweiknoten von Betonstahlmatten oder Bewehrungskrben fr vorgefertigte Bauteile aus dampfgehrtetem Porenbeton oder haufwerksporigem Leichtbeton This European Standard was approved by CEN on 25 March 1998. CEN members are bound to

12、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

13、 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

14、 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 Standardizat

15、ion Comit Europen de Normalisation Europisches Komitee fr 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 EEN1737:1998 BSI 05-1999 2 Foreword This Euro

16、pean Standard has been prepared by Technical Committee CEN/TC177, Prefabricated reinforced components of autoclaved aerated concrete or lightweight aggregate concrete with open structure, the secretariat of which is held byDIN. In order to meet the performance requirements as laid down in the produc

17、t 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

18、or by endorsement, at the latest by October1998, and conflicting national standards shall be withdrawn at the latest by October1998. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austr

19、ia, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Contents Page Foreword 2 1 Scope 3 2 Normative references 3 3 Principle 3 4 Apparatus 3 5 Test specimens 3 6

20、Testing procedure 4 7 Test results 4 8 Test report 6 Figure 1 Typical device for testing shear strength of welded joints 4 Figure 2 Typical auxiliary device for testing of joints with a diagonal bar 5 Figure 3 Shape and dimensions of test specimens with welded transverse bars 6 Figure 4 Shape and di

21、mensions of test specimens with welded diagonal bars 6EN1737:1998 BSI 05-1999 3 1 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 p

22、rEN12602 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 other publications. These normative references are cited at the appropriate places in the text, and t

23、he 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

24、 1520, Prefabricated components of lightweight aggregate concrete with open structure. prEN 12602, Prefabricated reinforced components of autoclaved aerated concrete. 3 Principle The shear strength of welded joints is determined on test specimens consisting of a longitudinal bar and a welded transve

25、rse bar or diagonal bar. In the case of welded joints, where the transverse bar forms an angle of90 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

26、from bending and twisting forces (seenote1). 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 i

27、s recorded. NOTE 1In 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 2Diagonal bars are mainly used as shear reinforcemen

28、t. In this case, the welded joint should be able to transmit the tensile force of the diagonal bar to the longitudinal bar. 4 Apparatus a) a device for cutting reinforcement without influence on the welded joints; b) calipers, capable of measuring the diameter of the reinforcing bars and the dimensi

29、on of the welded joint to an accuracy of 0,1mm; c) a tensile testing machine having a load capacity of at least 20kN, capable of measuring the load to an accuracy of1%; for routine control purposes machines with lower accuracy may be used, provided the actual accuracy is taken into consideration whe

30、n 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 measur

31、ed force is not increased by friction (see note). NOTEA typical device is shown inFigure 1. An auxiliary for testing welded joints with angles other than90 between the bars is shown inFigure 2. 5 Test specimens 5.1 Sample The sample for the preparation of the test specimens (usually reinforcement ma

32、ts 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 j

33、oints from every longitudinal bar and from different transverse (or diagonal) bars in sufficient number to satisfy the requirements in5.3. 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 toFig

34、ure 3 orFigure 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 Pre

35、paration 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 of0,1mm, using calipers.EN1737:199

36、8 4 BSI 05-1999 5.6 Conditioning of test specimens The test specimens shall be in equilibrium with a room temperature between (1030)C when being tested. 6 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

37、 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 j

38、oint 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 r

39、ate so that the stress increase in the tensioned bar does not exceed 5 N/mm 2 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. 7 Test results The shear strength is defined as the ultimate shear force which is

40、equivalent to the ultimate tensile force in the tensioned bar. The individual values and the mean value shall be rounded to the nearest0,1kN. Figure 1 Typical device for testing shear strength of welded jointsEN1737:1998 BSI 05-1999 5 Figure 2 Typical auxiliary device for testing of joints with a di

41、agonal barEN1737:1998 6 BSI 05-1999 8 Test report 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 Stan

42、dard; 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

43、 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

44、 standard method of testing; p) a declaration that the testing has been carried out in accordance with this European Standard except as detailed in8 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

45、 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 3 Shape and dimensions of test specimens with welded transverse bars Figure 4 Shape and dimensions of test specimen

46、s with welded diagonal barsblankBS EN 1737:1998 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing BritishStandards. It presents the UK view on standards in Europe and at the international level. It is incorporated b

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