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)
[IMAGE: https://steemitimages.com/DQmbHt5svPcWWfgvr8Haj6xE3yr6LoJcrCXPktHwpXpSm5r/4-2.jpg][IMAGE: https://steemitimages.com/DQmZsCJSmhNRwHWFSHGB9F4izAUzqecS7wVhn4wDRHU6gNm/2-2.jpg][IMAGE: https://steemitimages.com/DQmbamVA4U2ntzmQU4Kp31qt42oTBrUHBUooSY5ptpJtABu/1-3.jpg]
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)
[IMAGE: https://steemitimages.com/DQmY7PgNQo191GacGKeJeYcNg1MwUqvsp6SnTrN3vWZmeQ4/qws.jpg]
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.
