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It also ensures proper flexural action when cracking occurs. Otherwise the member would go into catenery as the cracking increases uncontrolled. It improves the ductility of the member.

Unfortunarely this has nothing to do with the question asked.

At 10:12 AM 25/03/2005, you wrote:
ACI 318-02, Commentary R18.9 gives a good description of why we should use a minimimum amount of bonded reinforcing.  Basically, the bonded reinforcing provides better energy dissipation as required for seismic loading.  The bonded reinforcing can be prestressed or conventional reinforcing. 
Bob Garner, S.E.

From: Stuart, Matthew [ mailto:mstuart(--nospam--at)]
Sent: Thursday, March 24, 2005 2:57 PM
To: seaint(--nospam--at)
Ms. Anderson,
You should consider arranging a visit/tour of your local precast/prestressed concrete manufacturer's plant.

From: Gil Brock [ mailto:gil(--nospam--at)]
Sent: Thu 3/24/2005 4:42 PM
To: seaint(--nospam--at)

To ensure that the stresses under all serviceability conditions are keep
within the code limits without having to add extra untensioned
reinforcement. Stresses at transfer and long term need to be checked and
also for transport, erection conditions.

At 06:18 AM 25/03/2005, you wrote:
>Can someone give me a lesson on debonding of prestressing strands in this
>type of construction?  What is the purpose?  Is it always necessary?  How
>might the length be determined? Anything else?
>Candi Anderson, P.E.

Regards  Gil Brock
Prestressed Concrete Design Consultants Pty. Ltd. (ABN 84 003 163 586)
5 Cameron Street Beenleigh Qld 4207 Australia
Ph +61 7 3807 8022              Fax +61 7 3807 8422
email:          gil(--nospam--at)
email:          sales(--nospam--at)
email:          support(--nospam--at)

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Regards  Gil Brock
Prestressed Concrete Design Consultants Pty. Ltd. (ABN 84 003 163 586)
5 Cameron Street Beenleigh Qld 4207 Australia
Ph +61 7 3807 8022               Fax +61 7 3807 8422
email:            gil(--nospam--at)
email:            sales(--nospam--at)
email:            support(--nospam--at)