soil structure interaction

[yazan1990]

Hiii
I am working on soil structure interaction using SAP2000.
First, i made a model included 5 story with fixed end and compute the displacement.
second, i used the same model but i used springs instead of fixed joint and compute the displacement.
is it true to make this to determine the SSI effect???

 

[IDS]

is it true to make this to determine the SSI effect???

That question does not have a yes/no answer. If your springs are a reasonable representation of the soil stress/strain behaviour, then yes, if not, no.

Deciding if the springs are in fact a reasonable representation of the soil is the difficult bit.

Doug Jenkins
Interactive Design Services

http://newtonexcelbach.wordpress.com/

 

[Captains210]

what is the stiffness of spring that you modelled is represent??

Is it represent the soil and foundation ??

Is it represent the dynamic stiffness and damping ??

How did you calculate the spring's stiffness??

 

[yazan1990]

I used the equations of stiffness foundation which is found in FEMA 356
Kx, Ky,Kz
So i used SAP2000 like this
Assign/joints/springs / i included Kx and so on