prEN 10138-4：2000 Prestressing steels Part 4：Bar

DRAFT prEN 10138-4

EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM

September 2000

ICS 77.140.60

English version

Prestressing steels - Part 4: Bars Armatures de précontrainte - Partie 4: Barres

Spannstähle - Teil 4: Stäbe

This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee ECISS/TC 19. If this draft becomes a European Standard, 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. This draft European Standard was established by CEN 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. 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. Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and shall not be referred to as a European Standard.

EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG

Central Secretariat: rue de Stassart, 36

© 2000 CEN

All rights of exploitation in any form and by any means reserved worldwide for CEN national Members.

标准下载网(www.bzxzw.com)

B-1050 Brussels

Ref. No. prEN 10138-4:2000 E

Page 2 prEN 10138-4:2000

Contents 1

Scope

4

2

Normative references

4

3

Terms and definitions

4

4

Designation

4

5

Manufacture

6

6

Requirements

6

7

Evaluation of conformity

9

8

Test methods

11

9

Delivery by the manufacturer

11

标准下载网(www.bzxzw.com)

Page 3 prEN 10138-4:2000

Foreword This Part of this European Standard has been prepared by SC2 'Prestressing steels' of the Technical Committee ECISS/TC19 'Concrete reinforcing and prestressing steels – Properties, dimensions, tolerances and specific tests' of which the Secretariat is held by BSI. This European Standard has been prepared under mandate M115 given to CEN by the European Commission and the European Free Trade Association and supports essential requirements of the EU Construction Products Directive (89/106/EEC). For relationship with the EU Construction Products Directive, see informative annex ZA, which is an integral part of Part 1 of this European Standard and by which it becomes a harmonized European Standard. EN 10138 is published in four parts, the other parts being: EN 10138-1, Prestressing steels — Part 1: General requirements EN 10138-2, Prestressing steels — Part 2: Wire EN 10138-3, Prestressing steels — Part 3: Strand All products placed on the market within the European Union and EFTA must be certificated in accordance with annex ZA of Part 1 of this European Standard. In accordance with the common rules of CEN/CENELEC the following member countries are obliged to adopt this standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland, United Kingdom.

Page 4 prEN 10138-4:2000

1

Scope

This Part of this European Standard gives the specific requirements for preferred sizes of round steel bar in straight lengths, plain or ribbed and supplied in either the hot rolled or hot rolled and processed condition. NOTE

2

General requirements are given in Part 1 of this European Standard.

Normative references

The following normative documents contain provisions which, through reference in this text, constitute provisions of this European Standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this European Standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest editions of the normative document referred to applies. Members of CEN/CENELEC maintain registers of currently valid European Standards.

EN 10027-1, Designation system for steels — Part 1: Steel names; principal symbols EN 10027-2, Designation system for steels — Part 2: Steel numbers prEN 10138-1, Prestressing steels — Part 1: General requirements CR 10260, Designation system for steel — Additional symbols prEN ISO 15630-3, Steel for the reinforcement and prestressing of concrete — Test methods — Part 3: Prestressing steels

3

Terms and definitions

For the purposes of this Part of this European Standard the terms and definitions given in prEN 10138-1 and the following apply. 3.1 unit of product 15 tonnes of bars of a single diameter coming from the same cast of steel

4

Designation

4.1 For the steel grades covered by this Part of this European Standard the steel names are allocated in accordance with EN 10027-1 and CR 10260; the steel numbers shall be allocated in accordance with EN 10027-2. 4.2

The designation shall consist of :

a) the number of this Part of this European Standard;

Page 5 prEN 10138-4:2000

b) the steel name consisting of: 1)

the letter Y for prestressing steel;

2)

the nominal tensile strength in MPa; 3)

the letter H for hot-rolled bar ;

c) the nominal diameter of the bar in mm; d) where necessary R for ribbed.

Example

EN 10138-4

Y

1030

H

26

R

Number of this Part of this European Standard Prestressing steel Nominal tensile strength (MPa) Hot rolled bar Nominal diameter (mm) Ribbed i.e.EN 10138-4-Y1030H-26-R NOTE

The steel number may be used instead of the steel name i.e.EN 10138-4-1.1380-26-R.

Page 6 prEN 10138-4:2000

5 5.1

Manufacture General

The bar shall be manufactured from steel in accordance with prEN 10138-1 :2000, 6.1.

5.2

Processing

The steel shall be hot rolled into bars. Where subsequent processing is required to achieve the specified mechanical properties, such processing shall take the following forms either singly or in combination: a) accelerated cooling; b) cold stretching; c) additional tempering.

5.3

Ribs

When ribbed bars are supplied, the design of the ribs shall be agreed between the manufacturer and purchaser. The ribs shall have a generally uniform spacing of not more than 0,8 d where d is the nominal bar diameter.

5.4

Welds

There shall be no welds in the bar as supplied to the purchaser.

5.5

Scale

Bars covered with a layer of scale shall be acceptable.

6 6.1

Requirements General

Nominal and specified properties are given in Tables 1, 2 and 3.

6.2

Straightness

The deviation from straightness for any length of bar shall not exceed 4 mm/m length.

6.3

Longitudinal defects

Longitudinal defects shall not exceed 0,3 mm in depth.

Page 7 prEN 10138-4:2000

Table 1 — Dimensions and properties of hot rolled and processed bars Steel Designation

Steel

Steel

Name

number

Nominal a

Bar surface Diameter f

Specified

Tensile

Cross-

strength

sectional

g

area

Mass

b c

Permitted

Rm

Sn

mm

MPa

mm

value of

value of

value of

nominal

maximum

0,1 % proof

maximum

mass

force

15

1100

177

1440

force

Fm

M 2

Maximum

deviation on

d

d

Characteristic Characteristic

g/m

e

Fp0,1

force

Fm, max

kN

kN

kN

194

159

224

2560

346

283

397

4009

526

426

605

Y1100H

1.1381

R

Y1100H

1.1381

R

20

1100

314

Y1030H

1.1380

P

25,5

1030

511

Y1030H

1.1380

P

26

1030

531

4168

547

443

629

Y1030H

1.1380

R

26,5

1030

552

4480

568

461

653

Y1030H

1.1380

P

27

1030

573

4495

590

478

678

Y1030H

1.1380

P

32

1030

804

6313

828

672

953

Y1030H

1.1380

R

32

1030

804

6530

828

672

953

Y1030H

1.1380

P

36

1030

1018

7990

1048

850

1206

Y1030H

1.1380

R

36

1030

1018

8270

1048

850

1206

Y1030H

1.1380

P

40

1030

1257

9865

1294

1049

1488

Y1030H

1.1380

R

40

1030

1257

10250

1294

1049

1488

Y1030H

1.1380

P

50

1030

1964

15386

2022

1640

2326

Y1230H

1.1382

P

26

1230

531

4168

653

573

730

Y1230H

1.1382

R

26,5

1230

552

4480

678

596

760

Y1230H

1.1382

P

32

1230

804

6313

989

869

1110

Y1230H

1.1382

R

32

1230

804

6530

989

869

1110

Y1230H

1.1382

P

36

1230

1018

7990

1252

1099

1400

Y1230H

1.1382

R

36

1230

1018

8270

1252

1099

1400

Y1230H

1.1382

P

40

1230

1257

9865

1546

1357

1730

Y1230H

1.1382

R

40

1230

1257

10205

1546

1357

1730

a

-2% to + 6%

2

The nominal modulus of elasticity may be taken as 205 GPa (kN/mm ) for as rolled and as rolled stretched and tempered bars and the secant 2 modulus between 5 % and 70 % of the specified characteristic maximum force may be taken as 165 GPa (kN/mm ) for as rolled and stretched bars.

b

For plain bars the mass is calculated from the nominal cross-sectional area and a density value of 7,85 kg/dm .

3

c

For ribbed bars the mass includes the ribs and may vary according to the rib profile.

d

For ribbed bars the cross-sectional area does not include the non-bearing portion of the ribs.

e

The specified characteristic 0,1 % proof force ,Fp0,1, is approximately 81 % of the specified characteristic maximum force, Fm, for 1100 MPa and 1030 MPa nominal tensile strength bar and approximately 88 % of the specified characteristic maximum force , Fm, for 1230 MPa nominal strength bar.

f

P - plain; R - ribbed.

g

1 MPa = 1 N/mm .

2

Page 8 prEN 10138-4:2000

Table 2 — Additional requirements for bars Property

Specification

Minimum elongation at maximum force, Agt, with Lo
200 mm

3,5 %

Maximum relaxation at 1000 hours For initial force corresponding to 70 % actual maximum force Nominal bar dia

 15mm

6%

Nominal bar dia

> 15mm

4%

Constriction at break

Ductile break visible to the unaided eye

Fatigue force range, Fr, where the upper limit, Fup, is 70 % of Fm

Number of cycles without fracture = or 6 > 2 x 10

Plain bars

200 MPa

Ribbed bars

180 MPa

a

1 MPa = 1 N/mm

a

a

2

Page 9 prEN 10138-4:2000

Table 3 — Additional requirements for NH4SCN stress corrosion test Diameter

Minimum lifetime to fracture in hours

d in mm

7

individual tests

median of all tests

d = 15

20

50

15