The Indian seismic code IS 1893

The Indian seismic code IS 1893

INTRODUCTION:

The Indian seismic code IS 1893 has now been split into a number of parts and the first part containing general provisions and those pertaining to buildings has been released in 2002. There has been a gap of 18 years since the previous edition in 1984. Considering the advancement in understanding of earthquake resistant design during these years, the new edition is a major upgradation of the previous version. This seminar reviews the new code; it contains a discussion on Clauses that are confusing or vague and need clarifications immediately. The typographical and editorial errors are pointed out. Suggestions are also include for next revision of the code.
With rapid strides in earthquake engineering in the last several decades, the seismic codes are becoming increasingly sophisticated. The first Indian seismic code (IS 1893) was published in 1962 and it has since been revised in 1966, 1970, 1975 and 1984. More recently, it was decided to split this code into a number of parts, and Part I of the code containing general provisions (applicable to all structures) and specific provisions for buildings has been published.
Considering advances have occurred in the knowledge related to earthquake resistant design of structures during the 18 years interval between the two edition of the code. Some of these new developments have been incorporated in 2002 version of the code, while many others have been left out so that the implementation of the code does not become too tedious for Indian professional engineers. For example, in the united states, the codes has revised every three years, and hence, typical building code in he united states has acquired sophistication gradually over about six revisions during these 18 years. Since the Indian code has had to make a quantum jump with respect to many of the provisions, it still requires considerable effort for an average professional engineer to fully appreciate the new code and to be able to implement it correctly.

In the above scenario, the following steps are urgently needed:
(i). Careful review of the new code to remove any deficiencies, errors or scope for misinterpretation
(ii). Development of explanatory handbook on the code to explain the new code with solved examples

It is not uncommon to have errors or omissions in the codes. However, it is important to quickly correct these errors or omissions. This paper reviews the code the suggestions for change in the next revision are listed. Also listed are Clauses that are confusing or vague and need clarifications immediately. Finally, the typographical and editorial errors are pointed out.


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