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jeeb SEFI Member
Joined: 23 Dec 2018 Posts: 10
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Posted: Fri May 15, 2020 4:49 pm Post subject: Beam Strip Raft Foundation |
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Hi, could seniors provide some insight on the beam-strip raft foundation as shown. It consists of ground bearing beams (supporting columns point loads and walls) and ground bearing slab which are designed separately. The ground bearing slab is only reinforced with a top mesh reinforcement. I would like to ask:
1. How to design the beams?
2. Should bottom reinforcement be provided in the ground bearing slab?
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es_jayakumar General Sponsor
Joined: 24 Nov 2011 Posts: 1408 Location: Cochin
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Posted: Sun May 17, 2020 6:19 am Post subject: |
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I hope this is a slab-beam type raft foundation. Why is it founded at ground level ? If the centre of gravity of the loads and that of the raft coincides, the upward soil pressure will be uniform. In that case, the slab and beams can be designed similar to a framed structure, using provisions of IS-456. It is a practice to provide steel at top and bottom in raft slabs. You can refer "Design of Reinforced Concerete Foundations" by PC Varghese, for guidance. Books by Swami Saran & Nainan P Kurian also cover this topic in detail.
E S Jayakumar
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jeeb SEFI Member
Joined: 23 Dec 2018 Posts: 10
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Posted: Sun May 17, 2020 2:01 pm Post subject: |
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Dear Jayakumar, Thank you for your reply. In fact I've this situation as show. I need to avoid footings encroaching the existing building and drain. So I thought of proving this solution while searching existing literature for potential solutions. What would you suggest as foundation solution for this problem?
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es_jayakumar General Sponsor
Joined: 24 Nov 2011 Posts: 1408 Location: Cochin
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Posted: Sun May 17, 2020 2:19 pm Post subject: |
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Slab-beam type raft looks fine for your case. As the raft will experience hogging moment at beam supports, top reinforcement alone will not suffice for raft slab.
E S Jayakumar
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jeeb SEFI Member
Joined: 23 Dec 2018 Posts: 10
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Posted: Mon May 18, 2020 2:48 pm Post subject: |
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Dear Jayakumar, thank you very much.
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