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RE: Banded and distributed tendons

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Ronald,

OOps, typo in second paragraph, second line corrected. The second "column strips" should have been "middle strips"

You should not get me started on this.

The PTI/USA approach is as you suggested, "a one way slab detailing? (banded tendons in one direction and in the other direction are distributed).". Limitations should be applied to this method in terms of maximum stresses at service (it should be uncracked based on true stresses based on elastic moment patterns and all applied effects including restraint etc) and the load types supported (uniform applied loads and uniform concrete sections).

The general approach used in Australia for 2way flat slabs is as you have suggested in the second sentence with column strips in each direction and middle strips in each direction. This is harder to do with unbonded tendons, because they are more difficult to weave into a 2way pattern than bonded tendons, but not impossible.


At 03:19 PM 17/03/2003 +0800, you wrote:
Thanks Gil for the reply.
Wouldn't this mean  a one way slab detailing? (banded tendons in one direction and in the other direction are distributed).
Although by adapting the equivalent frame method for a 2 way flat slab design, certain percentages of the tendons are to be for the column strips, for both directions (in banded form) and the balance would go for the middle strips.



 
Ronald
-----Original Message-----
From: Gil Brock [mailto:gil(--nospam--at)raptsoftware.com]
Sent: Monday, March 17, 2003 12:17 PM
To: seaint(--nospam--at)seaint.org
Subject: Re: Banded and distributed tendons
Importance: High

Ronald,
Clause 18.12.4 covers this.
Banded tendons in both directions would not provide a load path to the supports for the middle area of  slab. in each panel, unless it was designed and reinforced separately to span as a 2way slab panel to the bands in each direction.
At 11:49 AM 17/03/2003 +0800, you wrote:
Are there a specific requirements in the code to design a flat slab using banded tendons? Why do we use distributed tendon instead of banded tendons on other direction if it is a two flat palte design?
 
Thanks,
Ronald Garcia
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