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RE: Wall loading to exist. slab

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How sure are you of the slab?  It might be 3" thick or 5" thick instead of the 4" you stated; there are some good contractors doing residential work but there are some really bad ones too.  Also, was the slab cast on a dry sand that sucked all the water out of the bottom of the slab?  I wouldn't assume the risk but if you choose to; I think you sh
ould at least make a couple small holes to see what is really there.
 
Joe Grill <jgrill(--nospam--at)swiaz.com> wrote:
It?s vertical, I wasn?t very clear on that.  Also, It is a partition wall that wasn?t intended to be a bearing wall, but if the joists bear on it, it will assume some load, and that is the max load it would assume vertically.  The shear load to the wall is 216 plf and that is a wind load.
Joe
 
Joseph R. Grill, P.E. (Structural)
Shephard - Wesnitzer, Inc.
Civil Engineering and Surveying
P.O. Box 3924
Sedona, AZ  86340
PHONE (928) 282-1061
FAX (928) 282-2058
jgrill(--nospam--at)swiaz.com
 
-----Original Message-----
From: Mark E. Deardorff [mailto:mdeardorff(--nospam--at)burkett-wong.com]
Sent: Thursday, March 16, 2006 4:19 PM
To: seaint(--nospam--at)seaint.org
Subject: RE: Wall loading to exist. slab
 
Is that 780 plf vertical or horizontal in the plane of the wall?
 
Mark E. Deardorff, Structural Engineer
Burkett & Wong
San Diego, CA

From: Joe Grill [mailto:jgrill(--nospam--at)swiaz.com]
Sent: Thursday, March 16, 2006 10:30 AM
To: seaint
Subject: Wall loading to exist. slab
 
I am working on a small remodel.  There is a wall that has been shown as a partition wall that I would like to use as a shear wall.  The wall is supported on an existing 4? thick slab.  If the wall carries 780 plf I really don?t think that cutting the slab and adding a footing is required.  If I assume a 45 deg. distribution through the slab and add the thick of the wall (3.5?) the resulting soil pressure is only 810 psf almost half of the 1500 psf that is being used on the project.  The exist. slab is in very good condition.  Is there a reason why this just can?t be done?
Thanks,
Joe Grill
 
Joseph R. Grill, P.E. (Structural)
Shephard - Wesnitzer, Inc.
Civil Engineering and Surveying
P.O. Box 3924
Sedona, AZ  86340
PHONE (928) 282-1061
FAX (928) 282-2058
jgrill(--nospam--at)swiaz.com
 
 




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