Need a book? Engineering books recommendations...

Return to index: [Subject] [Thread] [Date] [Author]

RE: Surface Post-tension stressing

[Subject Prev][Subject Next][Thread Prev][Thread Next]
Ronald,

Yes, they do prefer end stressing and it is normally used for both bonded and unbonded.

But, if you have a longer internal span that requires significantly more prestressing than all of the other spans, it is more economical to use short tendons in that span, extending into the spans either side to provide for the large negative moments at the supports and stress them internally. In this type of situation you can save significant amounts of prestress by doing this but you must allow for this properly in the analysis and the design.


At 12:23 PM 17/03/2003 +0800, you wrote:
Thanks Gil. Just a follow up....
Isn't it, contractors prefer it to be end stressing.? They prefer adjusting the drapes instead of adopting the surface stressing in an interior span of a mutiple span like a flat plate slab. 
-----Original Message-----
From: Gil Brock [mailto:gil(--nospam--at)raptsoftware.com]
Sent: Monday, March 17, 2003 12:13 PM
To: seaint(--nospam--at)seaint.org
Subject: Re: Surface Post-tension stressing
Importance: High

Ronald,

Sometimes stressing access is not available at the edges. Sometimes it is more economical for some of the tendons to terminate at places other than at the ends of the slab/member, especially where span lengths vary or loads vary.

Can then needs to be taken to ensure that this is handled properly in the design.

Depending on the configuration, these tendons could be top or bottom stressed.


At 11:43 AM 17/03/2003 +0800, you wrote:
Can someone give the advantage of surface stressing vs. end stressing.
 
Thanks.

Regards  Gil Brock
Prestressed Concrete Design Consultants Pty. Ltd. (ABN 99003351504)
5 Cameron Street Beenleigh Qld 4207 Australia
Ph +61 7 3807 8022              Fax +61 7 3807 8422
email:          gil(--nospam--at)raptsoftware.com
email:          sales(--nospam--at)raptsoftware.com
email:          support(--nospam--at)raptsoftware.com
webpage:        http://www.raptsoftware.com

Regards  Gil Brock
Prestressed Concrete Design Consultants Pty. Ltd. (ABN 99003351504)
5 Cameron Street Beenleigh Qld 4207 Australia
Ph +61 7 3807 8022              Fax +61 7 3807 8422
email:          gil(--nospam--at)raptsoftware.com
email:          sales(--nospam--at)raptsoftware.com
email:          support(--nospam--at)raptsoftware.com
webpage:        http://www.raptsoftware.com