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RE: Un-bonded P-T in bridges

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I'm not familiar with the american practice in this issue,
but, yes of course in the european bridges you can see
lots of applications with unbonded postensioned cables.
French bridges have been using this arrangement with
grease injection. The ease for replacement and retensioning
of these cables, is mentioned as a clear advantage of this
procedure.

-----Mensaje original-----
De: Mark Geoghegan <structuraltech.vsl(--nospam--at)verizon.net>
Para: Seaint <seaint(--nospam--at)seaint.org>
Fecha: Jueves, 06 de Diciembre de 2001 12:37 p.m.
Asunto: Un-bonded P-T in bridges


>Dear SEAINT forum:
>
>I am familiar with the use of un-bonded post-tensioning in building
>structure throughout North America, but I am not aware of any new bridge
>projects in the USA today that use UN-bonded P-T in bridge decks - please
>correct me if I am wrong.
>
>If this is true, why?
>
>Does the AASHTO/DOT code/s prohibit its use?
>
>I am familiar with unbonded P-T tendons failures due to corrosion in say
>pre-1980's buildings (and a few bonded tendon failures on bridges too), but
>i am curious about unbonded PT in bridges.
>
>Historically, has unbonded P-T been used in bridge decks in the USA or
other
>parts of the world, and if so, does anyone have any project references?
>
>By UN-bonded P-T, I do NOT mean to include EXTERNAL P-T, rather ONLY
>greased-and-sheathed strand systems within concrete decks/elements etc.
>
>Thanks in advance.
>
>Mark Geoghegan
>
>
>
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