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Soil structure interaction for grid foundation.

Soil structure interaction for grid foundation.

(OP)
High all.

There are many books and article which specified spring stiffness for single, mat and also strip foundation for modeling and calculating revised period and damping considering SSI ( Soil structure interaction seismic effects on structure seismic demands) , but i have seen nothing how to do this for grid foundation. would you please advise me :
1-How I can calculate grid foundation springs?
2- Are there any reference?
3- i want to model the effect of SSI in some "equipment supporting structures in petrochemical plant which has RC frame and grid foundation".

thanks in adnavce

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