IS 4326 -1993 Code Book PDF free download
This Indian Standard was adopted by the Bureau of Indian Standards, after the draft finalized by the Earthquake Engineering Sectional Committee had been approved by the Civil Engineering Division Council. Himalayan-Saga Lush region, Ticonderoga Plain, Western India and Kusch and Kathiawar regions are geologically unstable parts of the country and some devastating earthquakes of the world have occurred there. A major part of the peninsular India, has also been visited by moderate earthquakes, but these were relatively few in number and had considerably lesser intensity. It has been a long felt need to rationalize the earthquake resistant design and construction of structures taking into account seismic data from studies of these Indian earthquakes, particularly in view of the heavy construction programmer at present all over the country. It is to serve this purpose that IS 1893 : 1984 ‘Criteria for earthquake resistant design of structures’ was prepared. It covered the seismic design considerations for various structures. As an adjunct to IS 1893, IS 4326 ‘Code of practice for earthquake resistant design and construction of buildings’ was prepared in 1967 and subsequently revised in 1976 to be in line with IS 1893 : 1975. Since 1984 revision of IS 1893 was minor, it did not require a revision of IS 4326. An expansion of IS 4326 was in fact thought of immediately after the Harbin earthquake of August 1988 when greater attention was needed on low-strength brickwork and stone masonry as well as earthen buildings; also repair, restoration and strengthening of earthquake-damaged buildings posed a serious issue. After intense deliberations, the subcommittee CEDE 39 : 1 decided to issue separate standards to cover these topics. It was further decided to cover detailing of reinforced concrete for achieving ductility in a separate standard to be used with IS 456 : 1978 ‘Code of practice for plain and reinforced concrete ( third revision )’. The present revision is based on these considerations. Recommendations regarding restrictions on openings, provision of steel in various horizontal bands and vertical steel at corners and junctions in walls and at jambs of openings are based on a range of calculations made using design seismic coefficient and the ductility of steel reinforcement. Many of the provisions have also been verified experimentally on models by shake table tests. The following are the major changes besides minor amendments affected in this revision of the standard:
a) Low strength brickwork and stone masonry are removed and developed into a separate standard;
b) Clauses on ductility details have been removed and developed into a separate standard;
c) Building categories have been introduced based on basic seismic coefficient, soil-foundation factor and importance factor as per IS 1893 : 1984; and
d) Size and position of openings in bearing walls has been specified in greater detail. In this standard, it is intended to cover the specified features of design and construction for earthquake resistance of buildings of conventional types. In case of other buildings, detailed analysis of earthquake forces will be necessary. Recommendations regarding restrictions on openings, provision of steel in various horizontal bands and vertical steel at corners and junctions in walls and at jambs of openings are based on a range of calculations made using steel design seismic coefficient and the ductility of steel reinforcement. Many of the provisions have also been verified experimentally on models by shake table tests. The Sectional Committee responsible for the preparation of this standard has taken into consideration the views of all who are interested in this field and has related the standard to the prevailing practices in the country. Due weight age has also been given to the need for international co-ordination among the standards and practices prevailing in different countries of the world. This edition 3.2 incorporates Amendment No. 1 (December 1995) and Amendment No. 2 (April 2002). Side bar indicates modification of the text as the result of incorporation of the amendments. 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 or analysis, shall be rounded off in accordance with IS 2 : 1960 ‘Rules for rounding off numerical values ( revised )’. The number of significant places retained in the rounded off value should be the same as that of the specified value in this standard.
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