Modified Seismic Clause For IRC

Indian Roads Congress has modified the seismic design provisions for bridges. The IRC strategy has been:

1. To go for major revision to the seismic provisions. These are being discussed and will take more time to finalise.
2. In the meanwhile, they have approved ``Interim Measures``.
Thus, as of now the IRC6 provisions stand modified as per enclosure.The enclosure has been taken from the Indian Highways, January 2003
issue. I may mention that the location of Calcutta is incorrectly shown
in zone IV and it should be in zone III.

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Seismic clause for IRC
seismic_clause.pdf389.84 KB