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effects due to earthquake

 
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PostPosted: Mon Oct 06, 2003 1:21 pm    Post subject: effects due to earthquake Reply with quote

Dear Prof. Kalyanraman,

First of all, I would like to congratulate you for opening discussions on draft code IS:800 via web. I do hope such procedure would be followed for other draft codes also which are of interest to members of this forum. Such efforts are all the more necessary as BIS does not respond to requests for drafts meant for wide circulation even to persons like me who were associated with BIS for a very long time.

I feel that IS:800 should have explicit provisions for earthquake effects as IS:1893 is primarily meant for RCC structures. In particular, the punitive clauses of IS:1893 should not be applied to steel structures. The empirical formulae for fundamental period [which is used for defining minimum base shear] is NOT applicable to steel structures.The modelling of steel structures could be far more accurate than RCC structure as the properties of section [EA,EI,GJ]can be accurately determined. Further, it is likely that steel structures would be "an engineered construction" and therefore let the forces as obtained from analysis be taken for design without imposing arbitrary penalties.

There is also a case for larger reduction factors for steel structures as compared to concrete construction !!
The reduction factor of 5 is mostly unachievable in RCC whereas it could be achieved in steel. Hence to have overall
effective seismic factor [a combination of Z,I,R,T] of the same order, R for steel structure could be larger, say, 5 & 6
instead of 4 & 5.

Some attention may also be given in composite construction in which the vertical elements are mainly steel or steel encased with concrete.

Sincerely,
A R Chandrasekaran

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