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Civil Engineering/IBC 2009 1809.13 Confusion

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Question
Hello Sir,
I am designing a concrete frame in seismic zone 4 to which I have assigned seismic design category E. I ave insufficient data for site soil so I have assumed soil type Sd. Now I m to ask that IBC 2009 1809.13 says,footings must be interconnected. Whether this requirement only for Site Classification as E,F or it is for all site classifications? Moreover this requirement means tie beams must be at footing level or Tie beams provided at plinth level also satisfies this provision?
Thanks and regards,
Waqas

Answer
Dear Waqas

The tie beams must be introduced in foundation level. They guaranty the footing of lateral resisiting frames be safe under slip action. They transfer the seismic horizonatal reaction to neighbour footings. Acually one can calculate the slip resisting force and design an appropriate footing with probably some piles to have a safe foundation . Actually with these provision you dont need such a sophisticated calculations. Then I assume that you need to fulfill this article of the code everywhere instead of so complicated calculations.

Regards
BEH

Civil Engineering

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Babak Esmailzadeh Hakimi

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