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RE: Elevated post-tensioned slab cracks

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Roger,

Thank you. I am interested in getting a copy of the TTI research paper.

I tried their web site (http://tti.tamu.edu/) but the paper (dated 1990)
does not seem to be archived there. Can you give me the full title and I
will call TTI and ask for a hard copy.

Many thanks

Mark Geoghegan
Honolulu, HI

             > -----Original Message-----
             > From: Roger Turk [mailto:73527.1356(--nospam--at)compuserve.com]
             > Sent: Sunday, January 12, 2003 9:19 AM
             > To: seaint(--nospam--at)seaint.org
             > Subject: Re: Elevated post-tensioned slab cracks
             >
             >
             > Mark Geoghegan,
             >
             > A belated response to your post.  You wrote:
             >
             > . > Roger, you did state that the "...banded tendons
             > creating an
             > . > over-compressed in-slab beam" but do not forget
             > that P/A from the banded
             > . > tendons will be dispersed over the entire panel,
             > so it will not really be
             > . > over-compressed, if I understand your
             > terminology correctly.
             >
             > Well, not exactly.  The original research, the
             > research that came up with the
             > conclusion that strength is independent of tendon
             > arrangement, *assumed* that
             > the stress would be distributed on a *45 deg* angle.
             >  Published research
             > (Paul Roschke, ca. 1990, et. seq.) from the Texas
             > Transportation Institute
             > shows that at the most, stress from banded tendons
             > is distributed at
             > approximately 30 deg and is effective for only 1 or
             > 2 metres from the center
             > of the band.
             >
             > A. Roger Turk, P.E.(Structural)
             > Tucson, Arizona
             >
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