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Etabs area spring

Etabs area spring

Etabs area spring

(OP)
Hello mates,
Please i want to perform a soil structure interaction in etabs 2013. I have assigned area spring of 60000KN/M2/M, in the 3 direction, is my definition correct. I was confused if the modulus of subgrade needs to be negative.
I also want to know how to place a restraints in the x and y direction of the raft.

Thank you.

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