1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS 5896:2012High tensile steel wire andstrand for the prestressingof concrete SpecificationPublishing and copyright informationThe BSI copyright notice displayed in this document
2、 indicates when the documentwas last issued. The British Standards Institution 2012Published by BSI Standards Limited 2012ISBN 978 0 580 74461 7ICS 77.140.15; 91.080.40The following BSI references relate to the work on this standard:Committee reference ISE/104Draft for comment 11/30241968 DCPublicat
3、ion historyFirst published April 1980Second (present) edition, May 2012Amendments issued since publicationDate Text affectedBS 5896:2012 BRITISH STANDARDContentsForeword ii1 Scope 12 Normative references 13 Terms and definitions 14 Symbols 35 Classification and designation 46 Information to be obtai
4、ned by the manufacturer 57 Requirements 58 Evaluation of conformity 79 Test methods 1110 Delivery conditions 1211 Wire requirements 1312 Strand requirements 17AnnexesAnnex A (normative) Product families 22Bibliography 23List of figuresFigure 1 Evaluation of tests results and a unit of inspection tes
5、ting route 10Figure 2 Indentation type T1 14Figure 3 Indentation type T2 14List of tablesTable 1 Symbols and corresponding designations 4Table 2 Force ranges for various types of prestressing steels in the axial loadfatigue test 7Table 3 Definition of unit of manufacture, unit of product and unit of
6、inspection 8Table 4 Minimum frequency of sampling and testing for factory productioncontrol of wire 9Table 5 Minimum frequency of sampling and testing for factory productioncontrol of strand 9Table 6 Coefficient k as a function of a number (n) of the test results for areliable failure rate of 5% (p
7、= 0.95) at a probability of 95% 11Table 7 Specified indentation dimensions for indent type T1 (also known astriple indent) 14Table 8 Specified indentation dimensions for indent type T2 (also known asBelgian indent) 14Table 9 Dimensions and properties of wires 16Table 10 Additional test requirements;
8、 prestressing wire only 17Table 11 Specified indentation 18Table 12 7-wire strand Dimensions and properties 20Table 13 Additional requirements for prestressing strand 21Table A.1 Product families 22Summary of pagesThis document comprises a front cover, an inside front cover, pages i to ii,pages 1 to
9、 24, an inside back cover and a back cover.BRITISH STANDARD BS 5896:2012 The British Standards Institution 2012 iForewordPublishing informationThis British Standard is published by BSI Standards Limited, under licence from The British Standards Institution, and came into effect on 31 May 2012. It wa
10、s prepared by Technical Committee ISE/104, Concrete reinforcing and prestressingsteels. A list of organizations represented on this committee can be obtained on request to its secretary.SupersessionThis British Standard supersedes BS 5896:1980, which is withdrawn.Relationship with other publications
11、This standard has been revised to follow BS EN 10138-1 (in preparation). Definitions, symbols, steelmaking and manufacturing processes, routine inspection and testing, test methods, identification of the manufacturer and technical class and verification of mechanical properties in the case of disput
12、e may be taken from BS EN 10138-1, when published.CEN Derogation from standstillThe European Committee for Standardization (CEN) have granted derogation from standstill to permit BSI to publish this British Standard as a UK national standard. This derogation is to enable the continued production of
13、steel products for the prestressing of concrete, incorporating the latest products on the UK market, and for reasons of product safety and has been granted until publication of the BS EN 10138 series.Presentational conventionsThe provisions of this standard are presented in roman (i.e. upright) type
14、. Its requirements are expressed in sentences in which the principal auxiliary verb is “shall”.Commentary, explanation and general informative material is presented insmaller italic type, and does not constitute a normative element.Contractual and legal considerationsThis publication does not purpor
15、t to include all the necessary provisions of a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity from legalobligations.BRITISH STANDARDBS 5896:2012ii The British Standards Institution 20121 ScopeThis British Standard specifies gener
16、al requirements for uncoated high tensilestrength steel products, which are used widely for the prestressing of concreteand are also used for other tensile applications in the construction field. Thestandard applies only to products as supplied by the producer.2 Normative referencesThe following doc
17、uments, in whole or in part, are normatively referenced in thisdocument and are indispensable for its application. For dated references, onlythe edition cited applies. For undated references, the latest edition of thereferenced document (including any amendments) applies.BS EN 10020, Definition and
18、classification of grades of steelBS EN 10027-1, Designation systems for steels Part 1: Steel namesBS EN 10027-2, Designation systems for steels Part 2: Steel numbersBS EN ISO 15630-3, Steel for the reinforcement and prestressing of concrete Test methods Part 3: Prestressing steelBS EN ISO 16120-1, N
19、on-alloy steel wire rod for conversion to wire Part 1:General requirementsBS EN ISO 16120-4, Non-alloy steel wire rod for conversion to wire Part 4:Specific requirements for wire rods for special applications3 Terms and definitionsFor the purposes of this British Standard, the following terms and de
20、finitionsapply.3.1 product typespecific delivery form of prestressing steelNOTE See Table A.1.3.2 wire rodhot rolled steel delivered in coils, used for cold working treatments such as wiredrawing3.3 wireproduct manufactured by cold working wire rod that is in a suitablemetallurgical condition for co
21、ld working and which is given a finalthermo-mechanical treatmentNOTE The surface of the wire is plain or indented. It may be covered by a residueof drawing lubricant. The wire is wound into large diameter coils (see 10.3)ordelivered in bundles of cut lengths.3.4 strandproduct consisting of a number
22、of cold drawn wires spun together in the samedirection and with the same lay length that is given a final thermo-mechanicaltreatment and is then wound into large diameter coils (see 10.3)NOTE The common types of strands are as follows:a) 7-wire strand: a straight core wire around which are spun six
23、wires in one layer;b) 7-wire compacted strand: 7-wire strand that has been drawn through a die, orcompressed by other means, before the final thermo-mechanical treatment;BRITISH STANDARD BS 5896:2012 The British Standards Institution 2012 1c) 7-wire indented strand: strand produced from indented wir
24、es. The central wireof 7-wire indented strand may be plain with no indentations.3.5 unit of manufacturequantity of product of the same nominal diameter, surface configuration andtechnical class (strength class) that is manufactured according to specifiedmanufacturing conditionsNOTE The physical limi
25、ts on the unit of manufacture depend on each product type,see 8.2.2.1.3.6 unit of productquantity of product coming from a subdivision of a unit of manufacture,generally in the form as delivered to a customerNOTE The physical limits on the unit of product depend on each product type, see8.2.2.1.3.7
26、unit of inspectionquantity of product coming from a unit of manufacture and presented at anyone time for examination and release purposesNOTE The physical limits on the unit of inspection depend on each product type,see 8.2.2.1.3.8 consignment (delivery batch)total amount of the product in the same
27、delivery to a customer, which mayconsist of products coming from several units of manufacture3.9 characteristic valuevalue having a prescribed probability of not being attained in a hypotheticalunlimited test seriesNOTE In the context of this British Standard the characteristic value is (unlessother
28、wise indicated) the lower limit of the statistical tolerance interval at whichthere is a 95% probability (1 = 0.95) that 95% (p = 0.95) of the values are at orabove this lower limit. This definition refers to the long-term quality level ofproduction.3.10 inspectionconformity evaluation by observatio
29、n and judgement accompanied asappropriate by measurement, testing or gauging3.11 product familygroup of products of the same type and same technical class (strength class) (seeAnnex A)NOTE Their surface configuration may vary, e.g. plain or indented.3.12 factory production controlpermanent internal
30、production control exercised by the manufacturer3.13 standard propertiesproperties prescribed in this British Standard as part of the factory productioncontrol requirements for every unit of inspection3.14 special propertiesproperties prescribed in this British Standard that are not determined as pa
31、rt ofthe factory production control requirements for every unit of inspection3.15 maximum valuevalue which no test result shall exceedBRITISH STANDARDBS 5896:20122 The British Standards Institution 20123.16 minimum valuevalue below which no test result shall fall3.17 production or manufacturing site
32、site at which the product is produced3.18 testing laboratorylaboratory carrying out the various tests required to evaluate the productsNOTE It may be located at the manufacturers production area, located on themanufacturers site or located remote to the manufacturers site independent to themanufactu
33、rer.3.19 heat of steelquantity of steel corresponding to the same single melting operation identifiedby a single number so designated by the steel manufacturer(s)3.20 medianaverage value of the third and fourth test result from the ordered series ofresults of six corrosion tests3.21 threshold levelq
34、uantitative expression of the behaviour of a construction product, for an actionto which it is subject or which it generates under the intended use conditions3.22 threshold valuequantitative expression of the limiting value of a construction product, for anaction to which it is subject or which it g
35、enerates under the intended useconditions3.23 indentation lengthlength of individual indentations measured in the direction of the wire axis3.24 indentation depthmaximum depth of individual indentations measured radially from wire surface3.25 indentation spacingdistance between the centre of two suc
36、cessive indentations measured (or taken)in the direction of the wire axis (see Figure 2 and Figure 3)3.26 average diameteraverage of the diameters measured in two perpendicular directions, one ofwhich is the maximum diameter found by inspection3.27 ovalitydifference between maximum and minimum diame
37、ters4 SymbolsThe symbols used in this British Standard and the corresponding designationsare given in Table 1.BRITISH STANDARD BS 5896:2012 The British Standards Institution 2012 3Table 1 Symbols and corresponding designationsSymbol Unit Designationa mm Depth of the indentationsAgt% Specified minimu
38、m value of percentage total elongation at maximum forcec mm Indentation spacingCvkN Specified characteristic value for maximum force or 0.1% proof forced mm Nominal diameter of the productdswmm Nominal diameter of a constitutive wire of a strandD % Maximum permitted value of the average coefficient
39、of reduction of themaximum force in the deflected tensile testDimm Minimum internal diameter of a coil of wire or strandE GPa Modulus of elasticityf Hz Frequency of load cycles in the axial load fatigue testFmkN Specified characteristic value of maximum forceFm,maxkN Specified maximum value of maxim
40、um forceFp0.1kN Specified characteristic value of 0.1% proof forceFmakN Actual maximum force, in the tensile test, determined on a test piece adjacent tothe test piece submitted to special property testFupkN Upper force in the axial load fatigue testFrkN Force range in the axial load fatigue testl m
41、m Length of indentationk Coefficient function of the number of test resultsL0mm Original gauge length of the extensometer for the determination of Agtm g Mass of the test pieceM g/m Nominal mass per metre of the productmrkN Average value of the test results for maximum force or 0.1% proof forcen Num
42、ber of test results for maximum force or 0.1% proof forcer mm Mandrel radii for bend test machineRmMPa Nominal tensile strengths kN Estimated standard deviation of the test results for maximum force or 0.1% proofforceSnmm2Nominal cross-sectional area of the product Statistically reliable failure rat
43、e Force ratio, i.e. the ratio of the actual maximum force divided by the actual 0.1%proof force, as determined in the tensile testNOTE 1 MPa = 1 N/mm5 Classification and designation5.1 ClassificationAll steels covered by this British Standard shall be classified as special steelsaccording to BS EN 1
44、0020.5.2 DesignationThe products covered by this British Standard shall be designated as given in thisspecification.BRITISH STANDARDBS 5896:20124 The British Standards Institution 20126 Information to be obtained by the manufacturerThe following information shall be obtained by the manufacturer at t
45、he time ofenquiry and order: designation of the product in accordance with 5.2; the packaging and protection requirements and in the case of productssupplied in bundles, the maximum mass of the individual bundle; the requirements concerning information to accompany the delivery (e.g.delivery note, t
46、ype of inspection document see BS EN 10204, copies offorce/extension diagrams); special requirements for labeling; strand lay direction; nominal depth of indentations for indented wire.7 Requirements7.1 General7.1.1 Steel making processesThe steel may be made by any process, except that air or mixed
47、 air-oxygenbottom blown processes shall not be used.7.1.2 Primary incoming materialsThe primary products (billets, wire rod) shall be manufactured according to 7.1.1and associated processes which will ensure products fully conform torequirements. The wire rod shall conform to BS EN ISO 16120-1 andBS
48、 EN ISO 16120-4.7.1.3 Freedom from defectsThe finished product shall be free from any defects likely to impair itsperformance.Products with rusted steel shall not be supplied unless the rust is a thin film. Theunderlying steel surface shall appear to be smooth to the unaided eye.7.1.4 WeldsWire shal
49、l contain no welds in the product as supplied by the manufacturer.Strands with normal production lengths may contain welds made in theindividual wires before cold drawing, but shall not contain any welds madeduring or after cold drawing. Not more than one weld in any component wireshall be permitted in any 50 m of strand.7.2 Standard properties7.2.1 Geometrical propertiesThe geometrical properties shall be defined by a nominal diameter (d), anominal cross-sectional area (Sn) and a nominal mass per
