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Re: Broken Tendons

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John
Well, first of all what kind of slab is this?
If its hollow core slab its no problem. In holllow core slab, we often need to provision for openings ( to cater for mechanical equipments etc ) and the section is analysed & designed with extra tendons, keeping in mind that one or more tendons will be cut at site to allow provisioned openings to be used for the purpose it was created for. So, in case of your problem, you can analyze the cross section to examine the stress history, that is to know if the stresses are alright ( within allowable limits )at service & ultimate loads. Another important aspect is the deflection, especially due to sustained loads. Try it, you will find it a simple problem.
SYED FAIZ AHMAD
SENIOR STRUCTURAL ENGINEER
SAUDI OGER LTD
RIYADH, SAUDI ARABIA.


From: "John Dreger" <jdreger(--nospam--at)collinsengr.com>
Reply-To: seaint(--nospam--at)seaint.org
To: <seaint(--nospam--at)seaint.org>
Subject: Broken Tendons
Date: Fri, 8 Jun 2001 13:16:12 -0500

Hi Everybody,

I've been asked to analyze a prestressed slab in which one of several
tendons has broken.  We have the actual (initial) elongations of the
tendons, and, assuming that everything is still in the elastic range, can
calculate the initial forces in each tendon. Eliminating the broken tendon,
and comparing the required total force with the actual (initial) forces
indicate that the slab should be OK.  However, as I've never come across
this problem before, I'd like to find out if here is a common procedure to
check the adequacy of slabs (or beams, for that matter) in which a tendon
has broken. Unfortunately, I don't have any more specific information right
now.

Thanks for any help.

John Dreger


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