BS EN 524-3-1997 Steel strip sheaths for prestressing tendons - Test methods - To-and-fro bending test《预应力钢丝索用钢带护套 试验方法 反复弯曲试验》.pdf

1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS EN 524-3 : 1997 The Eu

2、ropean Standard EN 524-3 : 1997 has the status of a British Standard ICS 77.140.75; 91.080.40 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Steel strip sheaths for prestressing tendons Test methods Part 3. To-and-fro bending testThis British Standard, having been prepared un

3、der 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 1997 BSI 1997 ISBN 0 580 28673 8 BS EN 524-3 : 1997 Amendments issued since publication Amd. No. Date Text affected National forewor

4、d This British Standard is the English language version of EN 524-3 : 1997. The UK participation in its preparation was entrusted by Technical Committee B/525, Building and civil engineering structures, to Subcommittee B/525/2, Structural use of concrete, which has the responsibility to: aid enquire

5、rs 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 thi

6、s 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

7、by using the Find facility of the BSI Standards Electronic Catalogue. 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, an EN title page, pages 2 to 4, an inside back cover and

8、a back cover.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 1997 Copyright reserved to CEN members. Ref. No. EN 524-3 : 1997 E EUROPEAN STANDARD EN 524-3 NORME EUROPE ENNE EUROPA

9、 ISCHE NORM March 1997 ICS 77.140.75; 91.080.40 Descriptors: Prestressed concretes, tubes, sheathing, prestressing steels, classifications, specification, verification, marking English version Steel strip sheaths for prestressing tendons Methods of test Part 3: To-and-fro bending test Gaines en feui

10、llard dacier pour ca bles de pre contrainte Me thodes dessai Partie 3: Essai de flexion dans les deux sens Hu llrohre aus Bandstahl fu r Spannglieder Pru fverfahren Teil 3: Hin-und Herbiegeversuch This European Standard was approved by CEN on 1997-01-27. CEN members are bound to comply with the CEN/

11、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 a

12、ny 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.

13、CEN members are the national standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.Page 2 EN 524-3 : 1997 BSI 1997 Foreword This European Standard has been pre

14、pared by Technical Committee CEN/TC 104, Concrete (performance, production, placing and compliance criteria), the Secretariat of which is held by DIN. This standard is a part of the series EN 524 Sheaths for prestressing tendons Test methods which additionally comprises the following Parts Part 1 De

15、termination of shape and dimensions Part 2 Determination of flexural behaviour Part 4 Determination of lateral load resistance Part 5 Determination of tensile load resistance Part 6 Determination of leaktightness (Determination of water loss) These European standards apply to EN 523 Steel strip shea

16、ths for prestressing tendons Terminology, requirements, quality control. 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 September 1997, and conflicting national standards shall be withdrawn at th

17、e latest by September 1997. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands,

18、 Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Contents Page Foreword 2 1 Scope 3 2 Normative references 3 3 Apparatus 3 4 Procedure 3Page 3 EN 524-3 : 1997 BSI 1997 Dimensions in millimetres Figure 1. Test set-up for assessing flexibility (To-and-fro bending test) Figure 2. S

19、equence of bending 1 Scope This European Standard lays down the procedure for determining the flexibility of sheaths for prestressing tendons which comply with EN 523. 2 Normative references This European Standard incorporates by dated or undated reference, provisions from other publications. These

20、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

21、references the latest edition of the publication referred to applies. EN 523 : 1997 Steel strip sheaths for prestressing tendons Terminology, requirements, quality control EN 524-5 Steel strip sheaths for prestressing tendons Test methods Part 5: Determination of tensile load resistance 3 Apparatus

22、The test set-up (see figure 1) consists of a base in the centre of which a specimen of l = 1100 mm can be fixed in an upright position in such a way that it will offer sufficient bending. Two curved templates which allow horizontal shift of the templates in relation to the surface of the fixed sheat

23、h are placed perpendicular to the base. The radius r of each bending template shall correspond to the values given in either line 3a, 3b or 3c of table 1 of EN 523 : 1997. 4 Procedure The specimen shall be bent by hand to and fro twice around each curved section of the templates (see figure 1) over

24、a length of 800 mm. For the sequence of bending see figure 2. The overall time in which the whole bending sequence is to be carried out shall not exceed 2 min but the specimen shall not strike the templates with an impact. At the end of the bending procedure and with the test specimen in the final p

25、osition, a steel plunger with the shape and the dimensions given in figure 3 shall be inserted and pass through the whole length of the specimen. Straightening of the specimen by means of the tensile load test in EN 524-5 is permitted.Page 4 EN 524-3 : 1997 BSI 1997 d p = diameter of the plunger d 1

26、 = nominal internal diameter of the sheath h 1 = 1,25d p h 2 = 0,5d p h 3 = 0,75d p r =5m m Figure 3. Shape and dimensions of the steel plungerblankBSI 389 Chiswick High Road London W4 4AL | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |

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