Question Dear Sir; Wish you are doing fine .. I wan't to model the soil under the raft foundation in ETABS model so that the real interaction between the walls/columns and the foundation will be represented and letting the model specify the connection's type betewen them rather than assuming pin/fixed supports and then transfer these reaction to SAFE12 .... the value of the vertical spring will be the soil sub grade reaction .... what about the horizontal and rotational springs ?? Waiting your valuable guidance ^_^.
Thanks and Regards.
Answer Dear Salim
The horizontal and rotational springs have no influence on your problem result Then you can consider them more than 100 times the vertical springs or even more. after all the vertical deflection governs the moments induced in your foundation and structure.
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Education/Credentials Bs degree in Civil Engineering from Ferdowsi University ,1988, Mashhad Iran, Ms degree in Earthquake Engineering, Sharif University of Technology, 1993, Tehran, Iran