Elastic Support with Uplift on SOLID

[JonnyD1980]

I am trying to model a highly eccentic foundation with solid (3D) elements.

How do I add supports to a solid with a stiffness in -Z and capable of uplift in the +Z direction?

I have done this numerous times with panel type elements and it is very straightforward- however first time with solids.

Any help that can be offered would be appreciated.

[Rafal.Gaweda]

select support, click on side, select it...

[JonnyD1980]

Thanks for the response Rafal.

When I do this as an 'elastic' planar support I have to specify a stiffness in the Uz direction (kN/m). Does this act only in the downward (-Uz) direction. 

As I am modelling a foundation it needs a stiffness in downward but complete freedom to uplift.

Thanks in advance for any further help.

[Rafal.Gaweda]