Raft foundation

As a rule, raft foundation is used as a building’s foundation when the soil has a low bearing ca-pacity.

As shown at the following figure, the ribbed raft foundation reinforcement can be separated into three categories:
(a) slabs’ reinforcement (in yellow color)
(b) slabs’ free edges reinforcement (in blue color)

As shown at the following figure, the ribbed raft foundation reinforcement can be separated into three categories:
(a) slabs’ reinforcement (in yellow color)
(b) slabs’ free edges reinforcement (in blue color)
(c) beams’ reinforcement (in green color)

Reinforcement of a raft foundation with hidden beams
The stirrups placed inside the hidden beams may be two-legged or four-legged (as they are in this example). On other occasions, stirrups with more than four legs can be used.