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Re: Concrete Column Footings[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: seaint(--nospam--at)seaint.org
- Subject: Re: Concrete Column Footings
- From: rlewis(--nospam--at)techteam.org (Richard Lewis)
- Date: 13 Jan 1999 18:20:49 GMT
- Cc: seaint(--nospam--at)seaint.org
seaint(--nospam--at)seaint.org,Internet writes: Situation: I have a 20' concrete column that is only supported by 7'X7'X3' footing. Question: Is it sufficient to use the moments at the bottom of the column for finding footing bearing pressure, or do I need to add the footing thickness to the moment arm? Chris Towne, E.I.T. ctowne(--nospam--at)newwave.net No, that would underestimate the bending moment at eh soil surface. Overturning/bending is about the bottom surface of the footing, not the top surface/bottom of column. That is where the soil stresses occur. If you use the moment at the bottom of column/top of footing then you need to add an addition moment caused by the horizontal shear force with a moment arm of the footing thickness. __________________________________________________ Richard Lewis, P.E. Missionary TECH Team rlewis(--nospam--at)techteam.org The service mission like-minded Christian organizations may turn to for technical assistance and know-how.
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