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RE: Thickened Floor Slabs

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Have you checked the out-of-plane Fp forces per linear foot of the wall.
Can the wall vertical reinforcing be developed in 6in thick slab. 

You will find a prudent solution for the subject question.



>>> sfaiz(--nospam--at) 10/07/03 09:11AM >>>
The wall loadings are essentially a line load concentrated only with
respect to its width. This loading normally produces tension on the
bottom of the slab. The tensile stress per se will control the
concrete's thickness for a constant thickness slab.
Like you said you checked its thickness, for the given wall loads based
on and to satisfy the punching shear stress, and found it to be ok. My
opinion, based on experience with such a case, is it may be
theoretically ok but the slab is quite thin. The wall is 6-in thick and
14-ft high; this makes quite a considerable linear load. It would be
prudent to thicken the slab by following the "classical details" to
avoid any problem in future.
Syed Faiz Ahmad; MEngg, M.ASCE
Senior Structural Engineer
Saudi Oger Ltd
Riyadh, Saudi Arabia
-----Original Message-----
From: Lester Unger [mailto:lesterunger(--nospam--at)] 
Sent: Tuesday, October 07, 2003 6:39 PM
To: seaint(--nospam--at) 
Subject: Thickened Floor Slabs
What factors do I need to look at for 6" interior non-bearing masonry
walls on 4" floor slabs on grade? My company had some typical details of
thickened floor slabs under all 8" and 6" interior masonry walls. We no
longer use these details. Typically we put all 8" walls on wall footings
and 6" non bearing walls on 4" slab on grade. I checked the floor slab
as if it were a footing and found it to be OK with a 6" cmu wall 14'
high on it. The construction manager is insisting on the thickened floor
slabs at the 6" walls. I don't feel these are necessary. Comment would
be appreciated.
Thank you.

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