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Re: modified footing design

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This is the fourth copy of this request that I have received.  Are
others getting multiple copies as well?

				Regards,

				H. Daryl Richardson

Phillip Rogers wrote:
> 
>  I am a young engineer interested in learning more
> about foundation engineering.  I  understand spread
> footing design.  My problem is finding the method of
> determining the adequacy of a modified footing.
> Specifically:
> 
> There is an existing 4'X 13.5' caisson supporting a
> tower structure.
> The problem lies in the need to modify this footing to
> make up for the tower's extension and additional load.
> The proposed method is to place an 8' square, 2' thick
> collar footing around the caisson.  This addition is
> held on to the caisson by steel bars drilled into
> place.  This addition is 1.5' underground and 3.5' to
> the base.  The addition is reinforced with #11 bars
> top and bottom (3 on the outer part of all sides of
> the caisson and 6 U-Bars in the middle sections on all
> sides).
> 
> How does one go about checking the reinforcment and
> dimensional adequacy for such a modification?  What
> kind of calculations must be done that differ from
> that of a spread footing design?
> 
> I understand the need for such a design.  But where
> can I find the supporting calculation methodology for
> such a case?
> 
> thanks
> 
> 
> 
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