BS EN 524-2-1997 Steel strip sheaths for prestressing tendons - Test methods - Determination of flexural behaviour《预应力钢丝索用钢带护套 试验方法 挠性的测定》.pdf

1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS EN 524-2 : 1997 The Eu

2、ropean Standard EN 524-2 : 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 2. Determination of flexural behaviourThis British Standard, having been

3、 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 1997 BSI 1997 ISBN 0 580 28674 6 BS EN 524-2 : 1997 Amendments issued since publication Amd. No. Date Text affected Nati

4、onal foreword This British Standard is the English language version of EN 524-2 : 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:

5、 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 repres

6、ented 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 Correspondenc

7、e Index, or 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 bac

8、k cover and 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 524-2 : 1997 E EUROPEAN STANDARD EN 524-2 NORME EUROPE

9、 ENNE EUROPA 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 Test methods Part 2: Determination of flexural beh

10、aviour Gaines en feuillard dacier pour ca bles de pre contrainte Me thodes dessai Partie 2: De termination du comportement a l a flexion Hu llrohre aus Bandstahl fu r Spannglieder Pru fverfahren Teil 2: Bestimmung des Biegeverhaltens This European Standard was approved by CEN on 1997-01-27. CEN memb

11、ers 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 applicati

12、on 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 s

13、ame status as the official versions. 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 524-2 : 1997 BSI 1997 Forewor

14、d This European Standard has been prepared 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 co

15、mprises the following Parts Part 1 Determination of shape and dimensions Part 3 To-and-fro bending test 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 t

16、o the EN 523 Steel strip sheaths 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 stand

17、ards shall be withdrawn at the 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, It

18、aly, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Contents Page Foreword 2 1 Scope 3 2 Normative references 3 3 General 3 4 Specimen 3 5 Procedure 3 6 Test results 3Page 3 EN 524-2 : 1997 BSI 1997 Dimensions in millimetres Figure 1. Test set-up for de

19、termining the load F pl at the beginning of plastic deformation 1 Scope This European Standard specifies the procedure for determining the flexural behavior of sheaths for prestressing tendons which comply with EN 523. 2 Normative references This European Standard incorporates by dated or undated re

20、ference, 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 incorp

21、orated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. EN 523 Steel strip sheaths for prestressing tendons Terminology, requirements, quality control 3 General The flexural behaviour of sheaths is characterised by their load/deformati

22、on curve and the load F pl at the beginning of plastic deformation when subjected to three-point-bending. 4 Specimen A section of 1100 mm length of the sheath under consideration shall be taken. 5 Procedure The specimen shall be subjected to three-point-bending as shown in figure 1 by increasing and

23、 releasing the load F until plastic deformation begins to take place. The distance between the supports shall be l 1 = 1000 mm. The process of increasing and releasing the load F shall be observed by the load/deformation curve (see figure 2) until the load F has reached the value F pl under which th

24、e irreversilble deflectionDf t is not less than 5 % (0,05f t ) but not more than 10 % (0,10f t ) of the total deflection f t . Loading in the range of F pl should be maintained for at least 1 min. 6 Test results The load/deformation curve, the load F pl , the actual value of irreversible deflectionD

25、f t and the total deflection f t shall be reported.Page 4 EN 524-2 : 1997 BSI 1997 Figure 2. Load/deformation curve for the determination of F pl andDf tblankBSI 389 Chiswick High Road London W4 4AL | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |

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