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RE: Surface Post-tension stressing

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Title: Message
Banded unbonded PT.
-----Original Message-----
From: Mark Geoghegan [mailto:structuraltech.vsl(--nospam--at)verizon.net]
Sent: Monday, March 17, 2003 12:34 PM
To: seaint(--nospam--at)seaint.org
Subject: RE: Surface Post-tension stressing

Ronald,
 
I notice from your e-mail/web address you are located in the Philippines so is your question related to BONDED or UNbonded PT?
 
It is not uncommon for BONDED slab tendons (flat duct, grouted) to be internally stressed - from the top or bottom surfaces - and is dependent of construction access issues and design issues too, eg large internal spans where additional prestress may be required.
 
It is somewhat UNcommon for UNbonded tendons (at least in the USA) to be internally stressed (pockets, recesses etc) unless perimeter stressing access is prohibited for some reason.
 
Mark Geoghegan
Honolulu, HAWAII
 
 
-----Original Message-----
From: Ronald R. Garcia [mailto:rrgarcia(--nospam--at)escaengineers.com]
Sent: Sunday, March 16, 2003 5:43 PM
To: seaint(--nospam--at)seaint.org
Subject: Surface Post-tension stressing

Can someone give the advantage of surface stressing vs. end stressing.
 
Thanks.