What the best Foundation system for this building. Please choose between the 3 options

[Ali.harmouch]

Salam Alaykum, The building is low rise, 4 floors building and consists of 10 Joints. each koint has 14m Width, about 40m Length and 4 floor height. Model in Etabs had been made for one typical joint with wind and searthquake design. Export to Safe had been done. What is the best foundation system to be used: A- Raft footing under each joint.(so we will have 10 raft footings with 2cm expansion joint between the rafts) this will give high pressure on the perimeter columns B- One Raft footing under the building. so we will have one raft footing with 14m width and 400 m length. the expansion joints will be for the superstructure only and will not be in the sub-structure. C- Isolated footings will be used under under each columns with top and bottom reinforcement. As my knowledge, this is should not be used since the building should be supported by raft footing in order to resist the lateral load (raft and wind) Note that in all the 3 cases, the soil pressure is less than the allowable soil pressure. Please advise. Salam .

 

[أحبك في الله]

As long as the soil bearing capacity is enough to carry the imposed loads, Use the isolated footings for sure, which can resist lateral loads easily with no problem if designed well

 

[Ali.harmouch]

Thanks for your reply. But the connection between the iolated fooring and the column will be pinned support and for lateral load design, the support should be fixed and that is the case for connection between column/raft. What do you think? Thank you

 

[أحبك في الله]

The designer can decide the connection that satisfy his needs also the isolated footings can resist moments of the fixed connection easily

 

[kimy]

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