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Re: Post-tensioned slabs on grade - need advice

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There is now criteria in the 1997 UBC, adopted from PTI stuff.  Edge and
interior thickening can be accommodated in your design, and is usually
necessary to take card of holdowns and large concentrated loads.  I
recommend you add mild reinforcing at any thickenings, and consider the
special requirements for footings as part of the lateral force resisting
system, if it's applicable to you.  Also:  From experience, I recommend you
don't fine tune the design too much -- it's very common to have tendons
mislocated or left out, and reinforcing poorly placed, which isn't a problem
if you have a little fat in the design.

----- Original Message -----
From: Jim Bailey <jsbailey(--nospam--at)>
To: <seaint(--nospam--at)>
Sent: Thursday, February 17, 2000 1:59 PM
Subject: Post-tensioned slabs on grade - need advice

> Hello,
> I have been asked (directed?) by a contractor on a design-build
> project to design a post-tensioned slab on grade, downturned at the
> edges for footings, with thickened slabs for interior bearing walls.
> The structure is wood framed one and two story in a warm temperature
> climate where frost is not a problem. There are no known soil
> problems.
> We do most of our work in colder climates with 30" minimum frost cover
> and standard footings. Frankly, I am unfamiliar with this type of
> construction and am looking for guidance in the form of the latest
> publications on p/t slabs on grade. We have info in our library, but
> it is fairly old.
> Any help or suggestions would be appreciated so I can quickly get up
> to speed. I don't normally check this list on a daily basis, so a
> private response would be helpful.
> Thanks,
> Jim Bailey