BS EN 1740-1998 Performance test for prefabricated reinforced components made of autoclaved aerated concrete or lightweight aggregate concrete with open structure under predominant.pdf

1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS EN 1740:1998 The Europ

2、ean Standard EN 1740:1998 has the status of a British Standard ICS 91.100.30 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Performance test for prefabricated reinforced components made of autoclaved aerated concrete or lightweight aggregate concrete with open structure under

3、 predominantly longitudinal load (vertical components)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 1998 ISBN 0 580 30145 1

4、 BS EN 1740:1998 Amendments issued since publication Amd. No. Date Text affected National foreword This British Standard is the English language version of EN 1740:1998. The UK participation in its preparation was entrusted to Technical Committee B/523, Prefabricated components of reinforced autocla

5、ved 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

6、 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 documen

7、t 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 Brit

8、ish 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, the EN title page, pages 2 to 6, an inside back cover and a back c

9、over.CEN European Committee for Standardization Comite Europe en de Normalisation Europa isches Komitee fu 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 1740

10、:1998 E EUROPEAN STANDARD EN 1740 NORME EUROPE ENNE EUROPA ISCHE NORM April 1998 ICS Descriptors: Concrete, cellular concrete, aggregates, reinforcing materials, prefabricated elements, mechanical tests, determination, mechanical strength, breaking load English version Peformance test for prefabrica

11、ted reinforced components made of autoclaved aerated concrete or lightweight aggregate concrete with open structure under predominantly longitudinal load (vertical components) De termination de la re sistance des e le ments pre fabrique sr e alise se nb e ton cellulaire autoclave ou en be ton de gra

12、nulats le gers a structure ouverte sous charge longitudinale pre dominante (composants verticaux) Bestimmung des Tragverhaltens von vorgefertigten bewehrten Bauteilen aus dampfgeha rtetem Porenbeton oder aus haufwerksporigem Leichtbeton unter vorwiegend in La ngsrichtung wirkender Belastung (vertika

13、le Bauteile) 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 bibliogr

14、aphical 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

15、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, Norwa

16、y, Portugal, Spain, Sweden, Switzerland and United Kingdom.Page 2 EN 1740:1998 BSI 1998 Foreword This European Standard has been prepared by Technical Committee CEN/TC 177, Prefabricated reinforced components of autoclaved aerated concrete or light weight aggregate concrete with open structure, the

17、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 Eu

18、ropean 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 n

19、ational 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

20、. Contents Page Foreword 2 1 Scope 3 2 Normative references 3 3 Principle 3 4 Apparatus 3 5 Test specimens 3 5.1 Sample 3 5.2 Measurement of component 3 5.3 Conditioning of component 3 6 Load test 4 6.1 Temperature conditions 4 6.2 Support conditions 4 6.3 Loading arrangement 4 6.4 Testing procedure

21、 4 7 Observations and measurements after the load test 6 8 Test report 6Page 3 EN 1740:1998 BSI 1998 1 Scope This European Standard specifies a method of determining the mechanical performances of prefabricated components made of autoclaved aerated concrete (AAC) according to prEN 12602 or lightweig

22、ht aggregate concrete with open structure (LAC) according to prEN 1520, under longitudinal load which may be combined with transverse load. These performances include: the deflections and maximum crack width in the serviceability limit state; the loadbearing capacity (failure load); the load-(vertic

23、al)deformation diagram, if required. 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 the publications are listed hereafter. For dated referenc

24、es, 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. EN 678, Determination of dry density of autoclaved aerated c

25、oncrete. EN 679, Determination of the compressive strength of autoclaved aerated concrete. EN 991, Determination of the dimensions of prefabricated reinforced components of autoclaved aerated concrete or lightweight aggregate concrete with open structure. EN 992, Determination of dry density of ligh

26、tweight aggregate 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. prEN 1520, Prefabricated components of lightweight aggregate concrete with

27、open structure. prEN 12602, Prefabricated reinforced components of autoclaved aerated concrete. 3 Principle The component is simply supported at its ends in a vertical position and loaded until collapse by a vertical line load with the required eccentricity with respect to the plane of the component

28、, in order to determine the deflection, cracking behaviour, and the loadbearing capacity. Alternatively, the support at the bottom of the component may be chosen as a rigid support. The component may be loaded additionally in a horizontal direction by two line loads acting in the outer quarter point

29、s of the span and distributed over the full width of the component through rigid steel sections. 4 Apparatus a) a device for applying the load continuously and without shock, with an accuracy of 3 %; b) devices for distributing the vertical load and, if required, the vertical support reaction unifor

30、mly over the width of the component through pivot arrangements consisting of a steel rod, resting in v-shaped notches of flat steel bars or held otherwise in lateral direction, and two sufficiently stiff load-distribution plates, all these parts extending over the full width of the component (see Fi

31、gure 1); c) a device for measuring the horizontal midspan deflection to an accuracy of 0,01 mm; d) (optional) a device for measuring the vertical compression (compressive strain) at midheight near the vertical edges of both faces of the component over a gauge length of at least 150 mm to an accuracy

32、 of 0,01 mm; e) a device for measuring the camber (deflection at midspan in unloaded state before testing), if any, to an accuracy of 1 mm; f) a device for determining the weight of the component to an accuracy of 3 %, if required. 5 Test specimens 5.1 Sample The test specimen is a prefabricated rei

33、nforced component (whole unit). It shall be selected in such a manner that it is representative of the product to be investigated. 5.2 Measurement of component Before the load test, the dimensions of the component shall be measured according to EN 991 and, if required, its weight shall be determined

34、 to an accuracy of 3 %. The camber at midspan in unloaded state before testing (e.g. due to non-uniform shrinkage) shall be measured to an accuracy of 1 mm while the component is resting without restraint on one of its edges in vertical position. 5.3 Conditioning of component The component shall not

35、 be frozen during the load test, and large temperature and moisture gradients within the component shall be avoided.Page 4 EN 1740:1998 BSI 1998 6 Load test 6.1 Temperature conditions The test may be carried out at any temperature of the test premises between +58C and +408C. If the temperature diffe

36、rs by more than 58C from +208C, this shall be indicated in the test report. 6.2 Support conditions The supports for the longitudinal load shall be horizontal and extend across the full width of the component. The load and the reaction forces shall be uniformly distributed over the width of the compo

37、nent. If the end faces of the component are not sufficiently plane, equalizing layers, e.g. consisting of a gypsum or mortar bed or a layer of soft fibre board, shall be provided between the end faces of the component and the load-distribution plates, according to 4b). If an additional transverse lo

38、ad is applied, the component shall be simply supported at both ends in a horizontal direction, and at least one of the supports (that at the end where the vertical load is applied) shall be moveable in vertical direction. The actual support conditions (including any equalizing layers) shall be descr

39、ibed in the test report. 6.3 Loading arrangement The longitudinal load shall be applied as a line load acting parallel to the plane of the component and being uniformly distributed over the width, with the required eccentricity e, if any, perpendicular to the plane of the component (see note). Atten

40、tion shall be paid that any curvature or camber acts in the same sense as the required eccentricity. The eccentricity in the plane of the component (in the direction of the width) shall be zero. The eccentricity of the load and of the support reaction shall be adjusted to an accuracy of 2 mm. A typi

41、cal loading arrangement is shown in Figure 1. If required, additional horizontal loads shall be applied in the outer quarter points of the span and distributed over the whole width of the component by means of rigid steel profiles. The actual loading arrangement shall be described and illustrated in

42、 the test report. NOTE Usually the same eccentricity is chosen at both ends. 6.4 Testing procedure After placing the component in the loading device in a vertical position, the required eccentricity of the support and the load shall be adjusted to an accuracy of 2 mm. The devices for measuring horiz

43、ontal deflections and vertical deformation (optional) at midheight shall be arranged according to Figure 1. The zero readings shall be made after application of a preload of about (1 to 5) kN. In the case of combined vertical and horizontal loads, their concurrence shall be specified, and the loadin

44、g sequence shall be defined. The load shall be applied in appropriate steps (approximately 1/10 of the expected loadbearing capacity) up to the failure load. The loading rate shall be such that the failure load is reached within (20 to 30) min. The deflection and the vertical deformation (optional)

45、shall be measured for at least four steps below and four steps above the serviceability limit state. Between steps, the load shall be increased continuously and without shock. The required level shall be reached within (25 to 35) s and then be maintained constant for 2 min. The deflection and vertic

46、al deformation (optional) shall be read after these 2 min. The test shall be performed in such a manner that the following data can be determined: loadbearing capacity (failure load); load-deflection and (optional) load-(vertical)deformation diagrams; development of cracking and failure.Page 5 EN 17

47、40:1998 BSI 1998 1 2 3 4 5 Measuring point for determination of horizontal deflection Measuring lines (gauge length$ 150 mm) for determination of vertical compression (optional) AAC- or LAC component Equalizing layer, if required Steel bar (e.g. 30 mm diameter) held in v-shaped notches or similar 6

48、7 8 e Flat steel plate (e.g. 30 mm3 160 mm) Rigid distribution plate, e.g. steel section, reinforced concrete slab or flat steel plate of at least 25 mm thickness Beam for load distribution Eccentricity Figure 1 Typical loading arrangementPage 6 EN 1740:1998 BSI 1998 7 Observations and measurements

49、after the load test After failure of the component, the following observations and measurements shall be made: position and shape of fracture; type of reinforcement; number, diameter, and cover of the reinforcing bars; thickness of individual concrete layers in the case of multilayer components; compressive strength of concrete according to EN 679 or EN 1354, respectively; dry density of concrete according to EN 678 or EN 992, respectively; mass related moisture content of concrete at time of testin