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I need help determining the best way to model a foundation in STAAD. I have an industrial structure that will eventually be support by a concrete mat foundation at grade. For construction purposes, the structure will be constructed with a series of six beams which run the longitudinal length of the structure with the structure's columns extending up from the beams. These beams and the structure above will be lifted into final position using a crane. The intent is for the beams to be placed on some precast concrete blocks at grade and the foundation constructed around them. I am thinking that this is a beam on elastic foundation problem, but do not know how to get STAAD to account for the stiffeness of the steel beams at grade correctly. Do you have suggestions?