Good day, I am trying to model this type of raft slab and stiffened beam on staad pro. My question goes thus from my few years of experience on raft foundation, the slab is designed with the net upward pressure. so now I have a beam and slab. does it mean some of my net pressure would be transferred to the beam when I modelled my raft slab on staad pro with elastic mat Foundation. I got the same results using my manual method. but when I decided to add beams to split the slab I noticed my plate moments reduced. now my superior colleague is saying something is wrong with staad, as all the pressure is supposed to be on the raft slab.

RAM | STAAD Forum raft with stiffened beam.

raft with stiffened beam.

Offline new struct over 2 years ago

Good day, I am trying to model this type of raft slab and stiffened beam on staad pro.

My question goes thus

from my few years of experience on raft foundation, the slab is designed with the net upward pressure. so now I have a beam and slab. does it mean some of my net pressure would be transferred to the beam
when I modelled my raft slab on staad pro with elastic mat Foundation. I got the same results using my manual method. but when I decided to add beams to split the slab I noticed my plate moments reduced. now my superior colleague is saying something is wrong with staad, as all the pressure is supposed to be on the raft slab.