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Re: FNDT: Shearwall and slab foundation question

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Probably the way I would go, but I would like to know if anyone has
considered the slab AS WELL AS any return on the thickened slab edge
(foundation) wall.
At one time, I was able to us the beam on elastic foundation design criteria
to prove that the concentrated load from a new column placed on a continuous
thickened edge or slab foundation was adquate over having to install a
spread footing. I modeled the slab edge, but considered it a grade beam and
did not consider the effects of the 3-1/2" slab itself.
I do, however, agree that the safest solution is to consider the gradebeam
independent of the slab. But, well, if anyone took the time to investigate
the same forces on a conventional slab on grade (foundation) I was
interested in how it was done.

-----Original Message-----
From: Bill Allen, S.E. <BAllenSE(--nospam--at)>
To: 'seaoc(--nospam--at)' <seaoc(--nospam--at)>
Date: Wednesday, February 04, 1998 4:06 PM
Subject: RE: FNDT: Shearwall and slab foundation question

Started using YOUR abbreviations again, eh?

IMHO, sounds like grade beam time to me. If this question came into my
office, I would have a hard time justifying the (free) time to do a
questionable analysis just to save the owner some bucks. I could always
respond "sorry about the grade beam, it was required due to a plan check
correction". Keep in mind, once you start distributing the forces a long
distance away, you will need additional reinforcement (in the slab, etc.)
anyway. I would question the capability of the slab/thickened edge to resist
uplift forces requiring an HD8A (6k +/-).

My $1.50
Bill Allen