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Re: Tolerable Slab Design

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We have a lot of expansive soils here in the valley. Residential structures
are typically founded on post-tensioned slab-on-grade designed using PTI
procedure. Sometimes we get warehouses on post-tensioned slab on grade, too.
Or you can overexcavate, remove the expansive soils and design conventional
footings on compacted structural fill. The geotechnical guy should provide
recommendations for excavation and filling and should also inspect earth
work.

Violeta Tihova, P.E.
Silver State Code Consulting
1785 E. Sahara Ave. Ste. 157
Las Vegas, NV 89104
Ph: (702) 866-2633
F: (702) 893-2463

----- Original Message ----- 
From: "seaint03" <seaint03(--nospam--at)lewisengineering.com>
To: <seaint(--nospam--at)seaint.org>
Sent: Wednesday, September 28, 2005 10:23 AM
Subject: Tolerable Slab Design


> I received a geotechnical report to review for a foundation design for a
pre-
> engineered metal building.  It is a warehouse type building with lots of
> open spaces.
>
> The building is located on expansive soil.  One of the items in the report
> states to "design the slab to tolerate potential upward slab movement on
the
> order of about 2 inches of active swell".  I don't recall ever seeing a
> design procedure for designing a slab on grade to accommodate upward slab
> movement of any amount.  IS there some design procedure I am not aware of?
> Can anyone cite a reference I can research to help understand it?
>
> What are others commonly doing to design a warehouse type slab, large open
> spaces, for upward movements?  My thoughts are frequent shrinkage and
> construction joints to isolate slab panels and facilitate replacement if
> needed.
>
> Thanks for any insight.
>
> Rich
>
>
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