IS 7215 (1974): Tolerances for fabrication of steel structures

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2 > 0 B Bhart hari N ti atakam Knowledge is such a treasure which cannot be stolen Invent a New India Using Knowledge IS 7215 (1974): Tolerances for fabrication of steelstructures [CED 7: Structural Engineering and structuralsections]1$:7215-1974 ( Reaffirmed 1995 ) Indian Standard Tolerances FOR fabrication OF steel structures ( Sixth Reprint JULY 1997 ) UDC : 0 copyrig1rl 1974 BUREAU OF INDIAN STANDARDS ,BAHADURSHAHZAFARMARG NEW DELHI 110002 Gr 6 l October 1974 IS : 7!21!i - 1974 Indian Standard Tolerances FOR fabrication OF steel STRUCTIJRES Structural Engineering Sectional Committee, SMBDC 7 Chairman Representing DIBECTO~ STANDARDS ( CIVIL ) Ministry of Railways Members SH~I L. N. A~~AWAL Industrial Fasteners Association of India, Calcutta SHRI M. M. MURA~KA ( Alternate ) Srrar A.

3 K. BANERJEE Metallurgical & \Engineering Consultants ( India ) Ltd, Ranchi SEBI S. SANKA~AN ( Alternate ) Sxxar P. C. BHASIN Ministry of Shipping & Transport, Department of Transport ( Roads Wing ) Sasx A. S. BISENOI ( Alternafe ) Da P. N. CHATTERJEE Government of West Bengal DB P. K. DAE Central Mechanical Engineering Research Institute ( CSIR ), Durgapur DR P. DAYARATNAM Indian Institute of Technology, Kanpur SHRI D. S. DESAI M. N. Dastur & Co Private Ltd, Calcutta DIRECTOR ( MERI ) Irrigation & Power Department, Government of Maharashtra, Bombay RESEARCH OYFICER ( Afternafe ) DIREOTOR ( TCD ) Central Water & Power Commission ( Power Wing ), New Delhi SHRI P. V. N. IYENQER ( Alternate) E~EOUTIVE ENOINEER ( CENTRAL Central Public Works Department, New Delhi STORES DN No. II ) SHRI M. M. Gnosrr Stewarts & Lloyds of India Ltd, Bombay SHRI S.

4 C. GHOSH (Afftrnate) SHRI A. G. GONSALVE~ SHRI S. S. BOSE ( Alternate) Bridge & Roof Co ( India ) Ltd, Howrah SHRI SAILAPATI GUPTA Public Works Department, Government of West Bengal, Calcutta SHRI G. S. IYER The Hindustan Construction CO Ltd, Bombay ), Calcutta SHRI S. M. GVLATEE ( Alternate ) DR 0. P. JAIN Institute of Engineers JOINT DIRECTOR STANDARDS Ministry of Railways (India (B &. S) DEPUTY DIRECTOR STAND- ARDS (B & S )-II (Alternate ) ( Continued on pop 2 ) @ Copyrighl 1974 BUREAU OF INDIAN STANDARDS This publication is protected under the ZnJicz Copyright Ad (XIV of 1957) and reproduction in whole or in part by any means except with written permission of the publisher shall be deemed to be an infringement of copyright under the said Act. IS:7215-1974 ( bage 1 ) Members deprescnting SRRI S. D. KALE Bombay MunicipaI Corporation, Bombay SHRI M.

5 K. R. SHARMA ( .4ltcmatc) DR M. N. KESHAVA RAO Struc;oroarLFengineering Research- Centre ( CSIR ) , SHRI Ore KNOSLA electrical Manufacturing Co Ltd, CalFuIta SHRI S. N. SINGH ( Alternate) PROF K. D. MAHAJAX Engineer-in-Chief s Branch, Army Headquarters SEIRI G. C. MATHUR National Buildings Organization, New Delhi - - SHRI K. S. SRINIVASAN (Alternate) SERI P. K. MALLICK Jessop & Co, Calcutta DR S. K. MALLICK Snnr N. V. M.~NA~ Indian Institute of Technology, Kharagpur Mantons ( Bangalore ) Pvt Ltd, Bangalore SARI A. K. MITRA Hindustan steel Ltd, Durgapur SHRI P. K. MUKHERJEE Braithwaite & Co (India ) Ltd. Calcutta SHRI P. T. PATEL ( Alternatc ) SRBI T. N. SUBBA RAO Indian Roads Congress, New Delhi DR D. IOHNSON VICTOR ( Alternate ) DR J. PUR&KOTHAM Central Water h Power Commission ( Water Wing ): New Delhi DEPUTY DIRECTOR (GATES & DESIGN ) ( Alternate ) REFRESENTATIVE SHRI A.

6 P. KAYAL ( Alternate) REPRESENTATIVE . SHRI P. V. NAIK ( Alternate ) PROF P. K. SOM SUPERINTENDINQ E N Q I N E E R ( PLANNINQ & DESIGN CIRCLE ) EXECUTIVE E N a I N E E R ( BUILDING CENTRE Drvr- sION ) ( Alternate ) MAJ P. R. E. VAZIFDAR SHR~ K. VEERARAGHVACHARI SHRI S. N. \;IORRA SHRI S. N. BASU (Alternate) SHRI C. R. RAMA RAO, Director ( Strut & Met ) Burn & Co Ltd, Howrah Richardson & Cruddas Ltd, Bombay Jadavpur University, Calcutta Government of Tamil Nadu Bombay Port Trust, Bombay bharat heavy Electricals Ltd, Tiruchirapalli Inspection Wing, Directorate General of Supplies & Disposals, New Delhi Director General, IS1 ( Ex-oficio Member ) Se6. etary SHRI M. S. NAGAEAJ Deputy Director ( Strut & Met ), IS1 Panel for fabrication of structures , SMBDC 7/P-17 Conucner SERI S. R. A~RAWAL Members SHRI S. N. BASU Research, Designs & Standards Organization ( Ministry of Railways ), Lucknow Inspection Wing, Directorate General of Supp!

7 Ies & Disposals, New Delhi SERI K. VEERARAOHVACHARI bharat heavy Electrical8 Ltd, Tiruchirapalli 2 IS:7215-1974 Indian Standard Tolerances FOR fabrication OF steel structures 0. F 0 R E M 0 R D This Indian Standard was adopted by the Indian Standards Institution on 27 February 1974, after the draft finalized by the Structural Engineering Sectional Committee had been approved by the Structural and Metals Division Council and the Civil Engineering Division Council. This standard is intended to serve as a guide to engineers engaged in design, fabrication and erection of steel structures in regard to dimen- sional Tolerances . Depending upon the importance and accuracy of workmanship required in their fabrication and erection, steel structures are broadly classified into three groups as detailed below: Group A - steel railway bridges and other structures which require closer Tolerances than those specified for Groups B and C.

8 Group B- steel structures having special characteristics and stmc- tures subjected to dynamic loading like bridges ( other than steel railway bridges ), crane gantry girders, supporting structure, Group C - steel structures like platform galleries, stairs, etc, which do not require closer Tolerances as required for Group B structures . In this standard only groups B and C are covered. The Tolerances for the fabrication of steel railway bridges and allied structures which fall into Group A will be covered in a separate standard. This standard keeps in view the practice being followed in this field in this country. Assistance has also been derived from CSN 732611 Limit deviations for dimensions of structural steel work issued by Urad pro normalizaci a mereni, Czechoslovakia. For the purpose of deciding whether a particular requirement of this standard is complied with, the final value, observed or calculated, expressing the result of a test, shall be rounded off in accordance with 3 IS : 7295 - 1974 IS: 2-11960*.

9 The number of significant places retained in the rounded off value should be the same as that of the specified value in this standard. 1. SCOPE This standard covers Tolerances on dimensions for fabrication of steel structures manufactured by riveting, bolting or welding. The Tolerances specified in this standard do not apply to structures like steel railway bridges which require closer Tolerances . This standard is not applicable to thin welded construction as in the case of box girders. 2. BUILT-UP SECTION The Tolerances on the dimensions of individual rolled steel components shall be as specified in IS : 1852-1973t. In the case of joints designed as friction grip joints using high tensile friction grip fasteners, the difference in thickness if any shall be adjusted by chamfering or by providing packing pieces. The maximum permissible gap S bet\.

10 Een the ccmpouents in the straight and curved portion of structures assembled by riveting or bolting (~8~ Fig. 1, 2 and 3 ) shall be as given in Table 1. TABLE 1 MAXIMUM PERMISSIBLE GAP IN BUILT-UP MEMBERS THICKNESS OF MEMBER* MAXIMUM PERMISSIBLE GAP ~~--~----h_~---_____~ Straight Portion Curved Portion r---_--) At edge At 20 mm _-_-A-__ At edge At 20 mm & from edge & S, from edge .% (1) (2) (3) (4) (5) mm mm mm mm mm Up to and including 28 o-2 Over 20 *When different thicknesses are involved the smaller thickness is to be considered. *Rules for rounding off numerical Values ( IErisCd). TSPecification for rolling and cutting Tolerances for hot-rolled steel products ( second rroision ) . 4 . IS : 7215 - 1974 All dimensiontin millimetres. All dimensions in millimetres. FIG. 1 GAPS IN THE COMPONENTS FIG. 2 GAPS IN THE COMPONENTS CONNECTED BY RIVETS OR BOLTS CONNECTED BY RIVETS OR BOLTS FIG.