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Concrete Column Footings

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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