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RE: Torsion on Precast Double-T

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In the summer 1996 issue of ASCENT magazine published by the
Precast/Prestressed Concrete Institute Craig Shutt, Managing Editor reported
on a study which said that double tees can be warped safely to the amount of
3/4" between stems and 1 1/2" over the full double-tee width. He said the
study showed "The stresses caused by a moderate warp are generally not
critical. The cracks resulting from a service warp are generally
longitudinal and do not penetrate the flange."  I wrote to him to find out
over what span lengths the study had used and never got a response.  I know
from experience that we have warped numerous double-tees with 1"
differential between tees with no visible problem. I can't recall a range of
spans where we did this but if you need double-tees as opposed to hollow
core plank, I would think that the spans are going to be long enough to
allow for some warp without problems. 

Roger C. Davis
Architect
SDS Architects, Inc.
205 N. Dewey Street
Eau Claire, WI 54703
(715) 832-1605


-----Original Message-----
From: Wontae Kim [mailto:Wontae.Kim(--nospam--at)unistresscorp.com] 
Sent: Tuesday, September 14, 2004 9:06 AM
To: seaint(--nospam--at)seaint.org
Subject: Torsion on Precast Double-T

Hi!

I have a double-T, 12DT34 with 60ft span.
Three out of  bearing positions are at the same level,
 but one should be lower for drainage problem.
How much can I lower this bearing position?
How can I check?




****Wontae Kim****
Unistress Corp.
Pittsfield, MA 01201
(Tel)  413-629-2031
(Fax) 413-499-0824

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