IS 5525 (1969): Recommendations for detailing of ...

1 Disclosure to Promote the Right To InformationWhereas 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 0 1 ' 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 !

2 > 0 B Bhart hari N ti atakam Knowledge is such a treasure which cannot be stolen Invent a New India Using Knowledge IS 5525 (1969): Recommendations for detailing ofreinforcement in reinforced concrete works [CED 2: Cementand concrete ]IS : 5525 - 1969 ( Heaflinncd 1990 I Indian Standard . RECOMMENDATlONS FOR detailing OF REINFORCEMENT IN REINFORCED concrete WORKS UDC UUHEAIJ OF INDIAN STANDARDS . MANAK HtlAVAN, 9 DAlIAIXJ11 SIIAII ZAFAK MARCJ NEW DI~ 110002 Gr7 September-1970 ISr5525-1969 ( wcammled 1990) Indian Standard Recommendations FOR detailing OF REINFORCEMENT IN REINFORCED concrete WORKS Joint Sectional Committee for concrete Reinforcement, BSMDC 8 , Chairman SHRI c. P. MALnc M#mbrrs SHRI B. D. AHUJA SHRI 0. N. GUPTA ( Al&raate ) Srmt A. P. BAGCHI SHRI K. K. BASIJ SHRI B. B. BHA-ITACHARJEE SHRI A. S. BISHNOI SHRI H. P. BODHANWALLA Da S. M. K. Crim-rv Central Public Works Department _ National Buildings Organization Sahu Cement Seavice, New Delhi Indian Iron & Steel Co Ltd, Calcutta IRC Steels Ltd, Calcutta Ministry of Transport & Shioping ( Roads Wing) Tata Iron &_ Steel Co Ltd, Jamshedpur Cent;~or~eddmg Research Institute ( CSIR ), Research Designs & Standards Organization ( Ministry of Railways ) DEPUTY Dm%TOR STANDARns (B & S)-1 Assts r~~~ D~RIXTOR STANDARm ( M/C) ( Altumula) DIRECTOR ( FA~AUA BARRAGE ) Central Water & Power Commission Srrtu V.)

3 GULATI Heatly & Gresham SHRI B. N. G~JPTA k td, New Delhi SHRI S. BA~~ERJEE ( Altanaie ) Steel Re-Rolling MI 1s Association of India, Calcutta SEIRI P. K. GIJPTE National Metallurgical Laboratory ( CSIR ), Jamshedpur SHRI I-IAR~HAND SIN~H Indian Steel and Wire Products Ltd, Jamshedpur SHRI R. R. KAPLISH ( kltcrnafr ) SHRt c. L. h. IYENoAR The concrete Association of India, Bombay SHRI Y. K. MEI-ITA ( Altematc ) SHRI s. s. KASHYAP Gammon India Limited, Bombay SHY S. Y. KHAN Killick Nixon & Co Ltd, Bombay Smu S. M. BIL~RAMI ( Alfsrnate ) SHRI S. C. MAZUMDAR Gannon Dunkerley & Co Ltd, New Delhi SHRt N. H. PAI ( Alkmate ) DR P. K. MOHANTY Tor Isteg Steel Corporation, Calcutta DR INO P. K. BANERJEE ( Alternate ) SHRI P. R. NAIR Iron & Steel Controller, Calcutta SHIU K. R. N. SWAMI ( Alternate ) SHRI M. L. NANDA Central Public Works Department SUPERINTIINDINO SURVEYOR OF WORKS ( NORTHERN ZONE ) ( Alfcrnatr ) ( Cnntinucd OH paga 2 ) -- BUREAU OF INDIAN STANDARDS MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG NEW DELHI 110002 MnnbcrS Re~resdiag Bnro 0.

4 P. NARU~A Engineer-in-Chief s Branch, Army Headquarters SHRI B. K. PANT-Y Hindustan Construction Co Ltd, Bombay SRRI P. G. V. ho PROF G. S. RAMASWAMY Directorate Getera ?f Supplies & Disposals . Struc~o~~ke~gmeermg Research Ccntrc ( CSIR ), SHRI 2. GEORGE ( Ahnate) y w ~vE M. N. Dastur & Co ( P) Ltd, Bombay Hindustan Steel Ltd, Ranchi SHRI R. G. Joo ( Alternate ) SECRETARY Central Board of Irrigation & Power, New Delhi SHRI SHIRI~H H. SHAH Tensile Steel Ltd, Bombay SHRI I%NESH P. MEKD ( Alkmati ) &it V. M. T--rt SpunBap ia and Construction Co ( Baroda ) Ltd, Sxisu R. NA~ARAJAN, Director General,/BlS ( Ex-o@io Member ) Director ( Civ Engg ) Secretary SHR~ ?. R. TANEJA Deputy Director ( Civ Engg ), BlS Panel for detailing of Reinforcement, BSMDC 8 : PI Convener BRXG 0. P. NARULA Members Engineer-in-Chief s Branch, Army Headquarters SHRI A. K. BHATTACHARWA Railway Board Da~un DIRECTOR S T A N D A R D s Research Designs & Standards Organization SgI?

5 S b KHAMBHATI Public Works Department, Government of Gujarat SHR~ h. s. JALUNDHWALA ( Altcrnah ) SHRI G. P. LAHIRI ,tiHRI N. V. &iAsTRI SHRI C. N. SRINIVASAN Chatterjee i?z Polk, Calcutta Central Public Works Department M/s C. R. Narayana Rao, Madras 2 ls:5525-1!&9 Indian Standard Recommendations FOR detailing OF REINFORCEMENT IN REINFORCED concrete WORKS 0. FOREWORD This Indian Standard was adopted by the Indian Standards Institution on 22 December 1969, after the draft finalized by the Joint Sectional Com- mittee for concrete Reinforcement had been approved by the Civil Engi- neering Division Council and the Structural and Metals Division Council. Much time, effort and expense can be saved in the design office and at the site of work, if simple, clear and comprehensive drawings are prepared. Different practices have hitherto been followed in various design offices in detailing of reinforcing steel in reinforced concrete structures and this bs quite often resulted in waste of time and energy in interpretation of designers ideas and instructions by various agencies connected with fabrication and placement of reinforcement and construction of reinforced concrete stru&, tures.

6 I! has !Jeen z trempted in his standard to present unified and improved method: tf preparing drawings or the fabrication and placing of reinforcing ;r sieel il: ~oi k i-t%: structures. The use of these improved methods, it is xyeci, ~\i!i not only result in better reinforced concrete construction but will also simplify and reduce the amount of work ordinarily required to prepare such di x,: ings. These Recommendations sl:o~rld be read in conjunction with IS : 456- 1964* and 1S : 2502-1963t. \Vhile the common methods of detailing of reinforcement based on. good practice have been recommended in this standard, suitable dc~iatlons may bc made in special cases, if warranted by design requireme:;ts, provided they satisfy the requirements of IS : 456- 1964* and IS : 2502-i963t and ensure adequate safety by analysis or test or both. For the purpose c: &ciding \bhether a particular requirement of this standard is cornpLed \bilh. iire Grral va!

7 Ue, observed or calculated, expressing the result of a test or anal\&, shall be rounded off in accordance with IS : 2-1960:. The number of significant places retained in the rounded off value should be the same as that of thl: specified value in this standard. *Code of practice for plain and reinforced concrete ( second ret&on ). TCode of practice for and fixing of bars for concrete reinforcement. $Rulcs for rounding off nu:ncrical values (revised ). 3 Lc.. - lS:5525-1968 1. SCOPE This standard deals with the general requirements of detailing of rein- forcement in reinforced concrete structures. The Recommendations may be applied to all reinforced concrete structures with suitable modifications as may be necessary. 2. SYMBOLS AND ABBREVIATIONS For the purpose of this standard and unless otherwise defined in the test, the symbols and abbreviations given in to may be used. All reinforcement bars used in the structures shall be suitably designated and numbered both in drawing and schedule.

8 Symbols Relating to Cross Sectional Shafl and Size of Reinforcement Bars Plain hound bar es or I Diameter of plain round bar Plain square bar cl or Side of plain square bar Deformed bar ( including square # twisted bar ) or Nominal size ( equivalent diameter or side ) of the deformed bar ( see Note ) NOTE - In accordance with IS : 1139-1966. and IS : 1786-19667, the nominal size of the deformed bar is equivalent to the diameter or side of a plain bar having the same weight per metre run as the deformed bar. Symbols Relating to Shape of the Bar Along Its Length Bt Bent bar St Straight bar stp Stirrup 38 Spiral ct Column tie *Specification for hot rollrd mild steel, medium tensile steel and high yield strength Jt%l deformed bars ior couerete reintorcement ( reCreO ). tbpeclficarion for cold twisted steel bars for concrete rrinfLxcement 4 S bo& Relating to Position and Direction EW Each way @ Spacing centre to centre - Limit of area covered by bars - Direction in which bars extend S bols Rdating to Viirio~ Structural Mmtbns Bm J3eam (4 co1 Column(s) FG Footing(s) Girder(s) ; Joist(s) Lintel(s) LB Lintel Beam(s) Sb Slab(s) WL Longitudinal Wall WX Cross Wall The symbols, abbreviations and notes shall be used in a manner that will not create any ambiguity.)

9 For example, the notation 5 4 - 12 both ways may be interpreted as 12 No. 5 mm dia bars in each direction making a total of 24 or 6 Nos. 5 mm dia bars in each direction making a total of 12. To avoid this, it is better to write 5 4 St-12 EW, that is, 12 No. 5 mm dia plain round straight bars in each direction. The same would be true in referring to each face of a concrete structure. The use of the same type of line for the same purpose considerably enhances the clarity and usefulness of the drawing. The following notations are suggested: A concrete line ___- -- D;:eposed concrete or masonry wall Reinforcement -_- Centre line I I I I Dimension line ::lX-_Q:: concrete beam framing into column which extends through floor - __, L _ * __i&_.{&. concrete beam framing into column which stops at floor 5 1 o 5525 - 1969 Where bars end up in hooks or bends, as far as possible the hooks and bends shall be clearly indicated in the drawing.}

10 3. MARKS Marks for Parts of Buildings - Marks are used to designate the different structural members of a structure. Different structural members of a structure shall be marked using symbols, abbreviations and notations indicated in 2 and in the manncc indicated in and A key framing plan sha!l be prepared to a convenient scale and the two axes marked, one side with alphabets A; B, C, etc, and theotherwith numbers ( see Fig. 1 A ) . Normally with rectangular pattern, the same key framing plan may he used for all floors. However, if arrangement of beams vary for different flo(JrS a separate key framing plan with grid arrangement and axes may IX used for each of the Boor. The floors shall be specified in accordance with requirements of IS : 2332-1963* and abbreviations BT and MZ shall IX used for basement and mezzanine respectively, for example: BT - Basement MZ - Mezzanine Floor 1 Floor 2 Columt~s -- Columns and foundations shall be specified by grid arrangement giving reference to the floor, for example ( see Fig.))