IS-4326 : 1993 | Download Civil Engineering Code

IS-4326: 1993 EARTHQUAKE RESISTANT DESIGN AND CONSTRUCTION OF BUILDINGS — CODE OF PRACTICE( Second Revision )

About IS-4326 : 1993

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-Naga Lushai region, Indo-Gangetic Plain, Western India and Kutch and Kathiawar regions are geologically unstable parts of the country and some devastating earthquakes of the world have occurred there. 

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 weightage 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 3.3 incorporates Amendment No. 1 (December 1995), Amendment No. 2 (April 2002) and Amendment No. 3 (January 2005). 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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