I would like to model a spring support with displacement. Can this be done in STAAD?
Take a look at the Enforced support option in STAAD.pro. With this you can force a specific displacement on a node. Internally this is always used on conjunction with a support that is rigid in that direction, however.
To put some springiness into the system you can model another member parallel to the direction of the spring (like a stub perpendicular to a beam) and then apply the enforced displacement at the far end of that stub. The length, area and E value of the stub determine it's springiness.
offset_spring_enforced.std
Multi-linear springs might be another option.
You can use the SUPPORT DISPLACEMENT load at the enforced support.
Also find the attached model.
Structure3.std