28119938 SP 34 1987 Handbook on Reinforcement and Detailing

HANDBOOK ON REINFORCEMENT AND DETNLING

MANAK BHAVAN. 9 BAHADUR 8HAH 2AFAR MARG NEW DELHI110 002

BUREAU

OF

INDIAN

STANDARDS

SP 34 : 1987FIRST PUBLISHED AUGUST 1987 FIRST REPRINT DECEMBER 1992 SECOND REPRINT NOVEMBER 1995 THIRD REPRINT DECEMBER 1996 FOURTH REPRINT JULY 1997 FIFTH REPRINT MARCH 1999

0 BUREAU

OF INDIAN STAND.4RDS

UDC 666.982.24(021) ISBN 81-7061-006-O

PRICE Rs.600.00

PRINTED IN INDIA AT NUTAN PRINTERS, F-89/12, OKHLA INDUSTRIAL AREA, PHASE-I, NEW DELHI-110020 AND PUBLISHED KY BUREAU OF INDIAN STANDARDS, NEW DELHI-110 002

FOREWORDUsers of various civil engineering codes have been feeling the need for explanatory handbooks and other compilations based on Indian Standards. The need has been further emphasized in view of the publication of the National Building Code of India in 1970 and its implementation. The Expert Group set up in 1972 by the Department of Science and Technology, Government of India carried out in-depth studies in various areas of civil engineering and construction practices. During the preparation of the Fifth Five-Year Plan in 1975, the Group was assigned the task of producing a Science and Technology plan for research, development and extension work in the sector of housing and construction technology. One of the items of this plan was the production of design handbooks, explanatory handbooks and design aids based on the National Building Code and various Indian Standards and other activities in the promotion of the National Building Code. The Expert Group gave high priority to this item and on the recommendation of the Department of Science and Technology, the Planning Commission approved the following two projects which were assigned to the Bureau of Indian Standards : a) Development programmc on engineering construction, and b) Typification for industrial code implementation for building and civil

buildings.

A Special Committee for Implementation of Science and Technology Projects (SCIP) consisting of experts connected with different aspects was set up in 1974 to advise the BlS Directorate General in identification and for guiding the development of the work. Under the first programme, the Committee has so far identified subjects for several explanatory handbooks/compilations covering appropriate Indian Standards codes specifications which include the following : Design Aids for Reinforced Concrete to IS : 456-1978 (SP : 16-1980)

Explanatory

Handbook

on Masonry

Code (SP : 20-1981) (IS : 1893-1975 and

Explanatory Handbook on Codes of Earthquake Engineering IS : 4326-1976) (SP : 22-1982) Handbook on Concrete Mixes

(SP : 23-1982)

Explanatory Handbook on Indian Standard Code of Practice for Plain and Reinforced Concrete (IS : 456-1978) (SP : 24-1983) Handbook Summaries on Causes and Prevention of Indian Standards of for of Cracks Building in Buildings (SP : 25-1984)

Materials

(SP : 2 -I 983) (Lighting and Ventilation)

Functional Requirements (SP : 32-1986) Timber Water Engineering Supply and

industrial

Buildings

(SP : 33-1986) Drainage with Special Emphasis on Plumbir ng (SP : 35-1987)

Functional Foundation

Requirements of Buildings

of Buildings*

Steel Code (IS : 800-1984) Building Bulk Construction Practices in Steel

St,orage Structures

Formwork Fire Safety Construction Safety Practices (iii)

Tall

Buildings Code

Loading

This Handbook provides information on properties of reinforcing steel and &ta-iling requirements, including storage, fabrication, assembly, welding and placing of reinforcement in accordance with IS : 456-1978. As a result of the introduction of limit state method of design for reinforced concrete structures and the concept of development length, detailing has become extremely important as many of the design requirements are to be met through detailing. This Handbook is expected to guide the designer in detailing which include correct positioning of bare for a particular type of structural element and preparation of bar bending schedule. The detailing requirements as specified in IS : 4561978 have. been brought out as applicable to different structural elements in a building and explamed, wherever necessary. The relevant Indian Standards and other literature available on the subject have been taken into consideration in preparing the Handbook. The Handbook will be useful to concrete design engineers, field engineers and students of civil engineering. Some of the important points to be kept in view in the use of the Handbook are :

a) The reinforcement

has to cater to forces (bending moment, shear force, direct compression or direct te,nsion) at sections consistant with development length requirements at the particular section. Sound engineering judgement shall be exercized while applying the provisions herein and detailing should be such that the structural element satisfies the requirements of performance for which it is meant. Typical detailing drawings are included to illustrate one possible method of arrangement of bars for a particular condition. They should not be construde as the only possible method. the importance of ductility requirements in structures subjected to for

b) Considering

severe earthquakes, a separate section is included on the detailing requirements buildings in severe earthquake zones (Zones IV and V of IS : 1893-1984).

4 International

Standard IS0 4066-1977 Buildings and civil engineering drawings--Bar scheduling is reproduced iri Appendix B as a supplement to what is contained in the Handbook.

4 The Handbook

does nor .forrn part CI/ at?,* Indian SratdarJ OII Ihe srrhjwr ant/ does not have the status of an Indian Standard. In case o/&~pllte ahour A~rc~rpretarion or opinion expressed in the Handbook. the provisions o/relr\~atlt Irdiatl Startckartjs only shall app!bP. The provisions yf the Hwdbo~~k I>nrricyrIarI,l,tho.s~~reIaritlSq I(. other literature should be considererl as on(,, .sy~i~t~~t)rc~,rtor iflfi~rt~iuri~~ti 1Handbook is expected to serve as a companion document to the three handbooks already published on the subject of reinforced concrete, namely, SP : 16-1980, SP : 23-1982 and SP : 24-1983.

e)

The

f) AlI dimensions

are in mm unless

otherwise

specified.

The Handbook is based on the first draft prepared by the Central Public Works Depart-ment, New Delhi. Shri B. R. Narayanappa. Deputy Director, and Shri P. S. Chadha, Officer on Special Duty, Bureau of Indian Standards (BIS). were associated with the work. The assistance rendered by Shri A. C. Gupta, Assistant Chief Design Engineer, National Thermal Pdwer Corporation (NTPC), New Delhi, in the preparation

of this Handbook

specially in the formulation

of drawings is acknowledged.

The draft Handbook was circulated for review to National Council for Cement and Building Materials, New Delhi; Structural Engineering Research Centre, Madras; Indian institute of Technology, Madras; Indian Institute of Technology, New Delhi; Andhra Pradesh Engineering Research Laboratories, Hyderabad; Engmeering Construction Corporation Ltd. Madras; Engineer-in-Chiefs Branch, Army Headquarters, New Delhi; Engmeering Consultants (India) Limited, New Delhi; Gammon lndia Ltd, Bombay; M/s C. R. Narayana Rae, Architects & Engineers, Madras; STUP Consultants Ltd, Bombay; Research, Design and Standards Organization, Ministry of Railways, Luclcnow; Irrigation Department, Government of Gujarat; M/s H. K. Sen and Associates, Calcutta; Siddharth Shankar and Associates (Consulting Engineers), New Delhi; Roy and Partners (Architects & Engineers), New Delhi; Shrish Malpani(Architects & Engineers), New Delhi; and consideration while finalizing the Handbook. the views received were taken into

CONTENTSPage

SectionSection Section Section Section Section Section Section Section Section Section

1 2 3 4 5 6 7 8 9 10 11

Steel for reinforcement Detailing functions Structural drawing for detailing Gcncral detailing requirements Bar bending schcdulc dclailing) Foundations Columns Beams Floor slabs Stairs Special structurcs--dccp beams, walls, shells and folded plates, water tanks, RC hinges, concrete pipes, machine foundations, and shear walls Ductility requirements building of earthquake resistant(including dos and

1 9 13 2? donis in 53 67 x3 97 119 143

153 187 193 205 209 221 227

Section Section Section

12 I3 14

Transport, storage, fabrication, assembly and placing of steel reinforcement Typical strucrurai drawings Welding IS0 4066-1977 Building and civil cnginccring drawings-bar scheduling Dimensions and properties of hard-drawn steel wire fabric and other bars

Appendix A Appendix B Appendix C

SECTION

I

Steel for Reinforcement

As in the Original Standard, this Page is Intentionally Left Blank

SP : 34(!3&T)-1987

SECTION 1 STEEL FOR REINFORCEMENT1.1.3.1 Bars in straight lengths Tolerance, percent

1.0 Reinforcing bars/ wires for concrete reinforcement shall be any of the following conforming to accepted standards: Mild steel and medium tensile steel bars [IS : 432 (Part I)-1982 S cification for mild steel and medium tensi f steel bars and e hard-drawn steel wire for concrete reinforcement : Part I Mild steel and medium tensile steel bars (third revision)]. r

a) The tolerance on diameter shall be as follows: Diameter A Up to and Over including mm 25 35 50 80 100 mm 25 35 50 80 100 -

mm kO.5 kO.6 kO.8 k1.0 f1.3 + 1.6

b) High strength deformed

steel bars/ wires [IS : 1786-1985 Specification for high