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RE: Thickened slab detail

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I also recommend a transverse bar at 48" oc so that the longitundinal bars can be wired to them. This prevents the longitundinal bars from rolling off their brick support into the soil when the concrete is poured.
Jim K.
-----Original Message-----
From: Bruce Holcomb [mailto:bholcomb(--nospam--at)]
Sent: Tuesday, January 04, 2005 10:12 AM
To: seaint(--nospam--at)
Subject: RE: Thickened slab detail

I look at the thickened slab as I would a continuous footing and select longitudinal rebar to meet the requirements for temp. / shrinkage reinforcement.  I select a width for the bottom of the thickened portion to support the load and the slope of the thickened slab is a construction issue… I show it at about 1:1.



Bruce D. Holcomb, P.E., S.E.

Structural Engineer


Butler, Rosenbury & Partners

300 S. Jefferson, Suite 505

Springfield, MO 65806

ph. 417-865-6100

fax 417-865-6102

Architecture, Engineering, Interior Design, Planning & Development

Your Vision.  Our Focus.


-----Original Message-----
From: Jim Wilson [mailto:wilsonengineers(--nospam--at)]
Tuesday, January 04, 2005 8:44 AM
To: seaint(--nospam--at)
Subject: Thickened slab detail


Is there a "correct" slope to the underside of a slab

where it changes thickness such as at a thickened edge

or under a wall?  It's commonly drawn and constructed

as steep as 1:1 or 2:1.  PCA Slab design guide has an

exerpt from the Army tech manual showing it at 5:1

under a bearing wall.  I would guess that the steeper

the angle, the more it would increase the friction

value for the subgrade drag equation.  But maybe its



On a related note, is there a specific purpose for

adding 1 or 2 longitudinal bars at a thickened slab

section?  Is it one of those details for good measure,

or has it been proven necessary?


Thanks in advance,


Jim Wilson, PE

Stroudsburg, PA





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