Disclosure to Promote the Right To Information

Whereas the Parliament of India has set out to provide a practical regime of right to information for citizens to secure access to information under the control of public authorities, in order to promote transparency and accountability in the working of every public authority, and whereas the attached publication of the Bureau of Indian Standards is of particular interest to the public, particularly disadvantaged communities and those engaged in the pursuit of education and knowledge, the attached public safety standard is made available to promote the timely dissemination of this information in an accurate manner to the public.

! $ ' +-Satyanarayan Gangaram Pitroda

Invent a New India Using Knowledge

01 ' 5 Jawaharlal Nehru

Step Out From the Old to the New

1 +, 1 +Mazdoor Kisan Shakti Sangathan

The Right to Information, The Right to Live

! > 0 B BharthariNtiatakam

Knowledge is such a treasure which cannot be stolen

Invent a New India Using Knowledge

IS 2502 (1963): Code of Practice for Bending and Fixing ofBars for Concrete Reinforcement [CED 2: Cement andConcrete]

IS: 2502 - 1963 ( Renflirmed 1990 )

Zedian Standard

CODE OF I?RACTICE FOR BENDING AND FIXING OF BARS FOR

CONCRETE REINFORCEMENT

Twelfth Reprint MARCH 1998

Gr 7

UIX 691.87-42:693.554

@ Copyright 1964

BUREAU OF INDIAN STANDARDS MANAK BHA-VAN, 9 BAHADUR SHAH ZAFAR MARG

NEW DELHI 110002

May 1964

1

IS:2!502-1963 (lbAmTlled 1990)

Indian Standard

CODE OF l?RACTICE FOR BENDING AND FIXING OF BARS FOR

CONCRETE REINFORCEMENT

Joint Sectional Committee for Concrete Reinforcement, BSMDC 8

Chaitwan Representing

SHRI C. P. MALIK National Buildings Construction Corporation Ltd, New Delhi

SHRI I

L.

IS:2502 -1963

(Continued /mm page 1)

Meuhers Representing

Sml S. C. ~~.~zLJMD.~R Cannon Dunkerley t Co Ltd, New Delhi &RI S. K. C;UHI THAKURTA (AIlematc)

SHRl N. H. M0HU.u The Concre?e Association of India, Bombay SI~RI C. J>. N. JYINL;.\R (.lltcmate)

SHWI 5121. 1. N.\GAH!5IIETIi Roads Wing, Ministry of Transport & Com-

munications S~HI G. V~NKATIXILU (_+fEfcrhu/r)

SHRI E. I

I : 2502 - 1963

Indian Standard

CODE OF PRAQTICE FOR BENDING AND FIXING OF BARS FOR

CONCRETE REINFORCEMENT

0. FOREWORD

0.1 This Indian Standard was adopted by the Inclinn Standards Institution on 21 September 1963, after the draft finalized by the joint SLctiolrnl Committee for Concrete lieinforctment lrnd been approvc~tl by the Building Division Council and th[* Structnral and Mdals Di\,ision Council.

0.2 This standard is prepared with a view to assisting dcsigncrs, cnginc~s and contractors in drawing up precise bcntling schedules for reinforcement used in reinforced concrete construction, and also in the fising of rcinforcc- ment. Though, it is well appreciated that much of time and effort can bc saved on the site if rational dimensions for shaping the bars are supplied to the bar benders; different practices have been followed hitherto in drawing up the bar bending schedule. It is attempted in this standard to unify the various practices followed and to rationalize the bending schcdulc to correspond with metric scrics of rcinforcemcnt.

0.3 Rar bending is an operation which requires adequate -supervision, skilled workmanship and cfficent equipment; and any attempt to carry out the work with unskilled la b our and inefficient tools will undoubtedly result in unsatisfactory work. In view of this, certain recommended methods of bar bending are also included in this standard.

0.4 Though. this standard is primarily intended for the preparation of bending schedule for reinforced concrete work, it may also be generally adopted for mild steel reinforcement used in prestresscd concrete work.

0.5 The Sectional Committee responsible for the preparation of this stan- dard has taken into consideration the views of producers, consumers and technologists and has related the standard to the manufacturing and trade practices followed in the country in this,field. Due weightage has also been given to the need for international co-ordination among stan- dards prevailing in different countries of the world. These considerations led the Committee to derive assistance from the following Publications:

DRAFT REVISION OF B.S. 1478: 1948 BENDING DIMENSIONS AND SCHEDULING OF BARS FOR THE REINFORCEMENT OF CONCRETE. British Standards Institution.

3

IS : 2502 - 1963

AC1 315-1951 MANUAL OF STANDARD PRAC-CICE FOR DETAILING REINFORCED CONCRETE STRUCTURES. American Concrete Institute.

0.6 Wherever a reference to any Indian Standard appears in this code, it shall be taken as a reference to its latest version.

0.7 This standard is intended chiefly to cover the technical provisions relating to bending and fixing of bars for concrete reinforcement, and it does not include all the necessary provisions of a contract.

1. SCOPE

1.1 This standard covers symbols and approximate dimensions of bends, and bending and fixing procedures for reinforcement,

1.2 The dimensioning and bending of bars specified in this standard applies principally to reinforcement bars conforming to*IS: 432-1960 Specification for Mil(i Steel and Medium Tensile Steel Bars and Hard-Drawn Steel Wire for Concrete Reinforcement (Revised). They may also be used in the case of bars conforming to the following specifications with such modifications as may be found necessary:

tIS: 1139-1959 HOT ROLLED MILD STEEL AND MEDIUM TENSILE STEEL DEFORMED BARS FOR CONCRETE REINFORCEMENT

tlS: 1$%6-1961 COLD-TWIS~V% STEEL BARS FOR CONCRETE REINFOR- CEMENT

2. FORM OF SCHEDULE

2.1 In conjunction with the requirements of this code, standard form of reinforcement schedule as shown in Table I shall be used for purposes of detailing reinforcement in concrete work.

3. BEND DIMENSIONS AND SYMBOLS

3.1 General - The dimensions of bends should be so given that a minimum amount of calculation is necessary for marking off bars and setting the machine and stops. The dimensioning procedure shown in Fig. 1 and Tables II to IX (see p_ 7 to 14) should be adopted as far as possible.

3.1.1 Where no indication is given to the contrary, the angle between the portions of a bar at a bend shall be assumed to be a right angle. Bending dimensions in which angles are expressed in degrees should be avoided as far as possible. When bending b.ars of large diameter, care should be taken to ensure that the overall length of the bent bar does not excee.d the theoretical or calculated length.

3.1.2 When the shape of any bent bar is other than those covered by Tables III to IX but is made up by combining two or more shapes, the

*Since second revision issued as IS : 432 ( Parr I )-I966 and IS : 432 ( Part II )-1966. )Since rex ised.

4

IS : 2502 -1963

TABLE I ST.QNDARD FORM OF REINFORCEMENT SCHED1JL.E

(Clausz 2.1)

Schedule Number

LOCA- MARK TION DESIC-

N.4TION

(1) ( (2) Column C4 4R

25N

SIZE NUMBER 1 NUMBER AND

TYPE

--

(31 1 (4)

11s roond 5

I I

4 25 mm

TOTAL NUMBER

(6)

20

LENGTH SHAPE (.iLL DIMENSIONS

ARb IN ACCORDANCE WITH Tfl1.S STANDARD UNLESS

OTHERWISE STATED)

(7) (8)

3000mm Straight

NOTE 1 -The recommended widths of the above columns are reading from left to right 25. 20, 15. 15, 15, 15, IS and 75 mm. The 75 mm dimension may be reduced to 70 mm for paper sizes other than l A4. Adequate margin should be provided on either side, the left-hand margin being not less than 15 mm. The length of the form should not generally exceed that of *A4 size.

NOTE 2 - In co1 2, the bar identification that will be put on the labels attached to the bars shall appear. It should be simple. The first number in the mark designation refers to the number of identical bars in similar locations in the same section of a given member, and the letter R refers to round bars, the figure that follows the letter R represents the diameter or the nominal size of the bar in millimetres and N represents the identification number of the bar/bars given consecutively.

NOTE 3 - In co1 3. the quality and basic shape of the reinforcement bar shall be specified.

*A4 size is 210 x 297 mm.

bending dimensions shall be measured as shown for appropriate standard shapes. Where the shape of a bent bar is such that it cannot be obtained even by combining two or more standard shapes, the bars shall be fully dimensioned in the schedule and also the method of measuring the bending dimensions shall be indicated in the schedule; but such special shapes should be avoided as far as possible.

3.2 Bends and Hooks FGrming End Anchorages 3.2.1 Dimensions of Bends ad Hooks - Unless otherwise indicated in

the schedule, a semicircular hook or a bend forming an anchorage to a bar shall be bent with an internal radius in accordance with Fig. 1A and Fig. IB, respectively. The hook and bend allowances shall be in accordance with Table II.

5

IS : 2502 - 1963

4d MIN

H

IA Hook I6 Bend

NoTE 1 --k has a value of 2, in the case of mild steel conforming to*IS: 432- 1960 Spccilication for Mild Steel and Medium Tensile Steel Bars and Hard-Drawn Steel Wire for Concrctc Keinforcement (Kevised) or tIS: 1139-1959 Specification for Hot Rolled Mild Steel and Medium Tensile Steel Deformed Bars for Concrete Rcinforccment; 3, in tho case of medium tensile s