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Re: Post-Tensioning Repair

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Good comments, Bill.  Thanks.
I would have liked to go into a lot more detail about everything.  I didn't dwell on banded systems because it's been covered in other articles (including ones I've written...) but you're right,  more explanation would have been helpful.
The reference to the problem with the ACI 423.6 reference to couplers is a problem in ACI 423.6 though....  I was just pointing it out.
ACI 423.6 was a good starting point for a specification but it left a lot to be desired.
Gail Kelley 
-----Original Message-----
From: Sherman, William <ShermanWC(--nospam--at)>
To: seaint(--nospam--at)
Sent: Wed, 6 Jul 2005 10:03:56 -0400
Subject: RE: Post-Tensioning Repair

Ok, since you "invited criticism", I'll offer some "constructive criticism" of your article.  These are not major problems but would have made for easier reading.
1. The article states that it "provides a brief overview of unbonded post-tensioning repair".  But the next two sections of the article do not talk about repair - they discuss typical detailing of new designs.  It would have been clearer if these sections had been introduced as "before I discuss repair, I would like to review typical detailing of unbonded anchors ...". 
2. Under "Structural Systems Used in Post-Tensioning" you briefly mention "banded systems".  I would have liked to see a little more description of what a "banded system" is.
3. Under "Structural Systems Used in Post-Tensioning" you state "If the column spacing required for the office or residential floors does not allow an efficient parking layout, ...".  On first reading, this sounded like people are parking cars in their office or residence! 
4. You note that ACI 423.6 only addresses protection for splice chucks, not for stressing couplers - but the first sentence of that section states that "ACI 423.6 requires that couplers be protected ...".  How is a "stressing coupler" not a "coupler"?
William C. Sherman, PE
(Bill Sherman)
CDM, Denver, CO
Phone: 303-298-1311
Fax: 303-293-8236
email: shermanwc(--nospam--at)

From: gskwy(--nospam--at) [mailto:gskwy(--nospam--at)]
Sent: Wednesday, June 29, 2005 7:06 AM
To: seaint(--nospam--at)
Subject: Post-Tensioning Repair

For those who are looking for an opportunity to be critical:
I have an article on post-tensioning repair coming out in the July issue of Structure magazine,  which I think anyone who belongs to an SEA gets. 
If anyone reading it has questions, comments, or criticisms,  please feel free to make them known (either publicly or privately.)
It was intended to be a very basic introduction to post-tensioning repair, but I was somewhat limited by the allowable length.  I didn't explain some things very well and I left some important things out,  but as it was, the article was about twice as long as they told me to make it.
I can address comments, questions, and criticisms in a second article.
Gail Kelley