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RE: Critical section in Footings

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Refer to any good book on concrete design. (If you are in India, you can refer to Reinforced Concrete design by S.U.Pillai and D.Menon ,By Tata McGraw- Hill.)


The reason for taking moment at the face of column is the footing slab bends upward into a saucer-like shape on account of net soil pressure from below. Based on extensive tests it has been determined that on footing supporting  column the critical section for BM  will be at the face of column.


If you make a 3 D analysis  you can verify that maximum moment will be at the face of the column.




From: Sanjay.Sehdev(--nospam--at) [mailto:Sanjay.Sehdev(--nospam--at)]
Sent: 27 July 2006 13:47
To: seaint(--nospam--at)
Subject: Critical section in Footings


Can anybody give me an idea or refer to some literature on:

Why  the critical section for moment in footing(or a flat slab) taken at the face of the column?


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