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RE: PT Construction

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Sight unseen (my client's proxy server won't admit that link), bear in mind that these types of systems are often of "partial prestressed" design. That is, they can handle a certain amount of the dead load (and maybe construction live load, too), with the prestressing (post-tensioning in this case) handling the rest.
Obviously there's no way I could possibly determine if this is the case, but contractors doing this type of work aren't typically "stupid". (Of course, there's always stuff like this:

From: Will Haynes [mailto:gtg740p(--nospam--at)]
Sent: Friday, April 29, 2005 12:22 PM
To: seaint(--nospam--at)
Subject: PT Construction

I know this is going to be a stupid question for a lot of you, but I am young and this is the first time I have seen this kind of construction actually going up.
I attached a link to a picture of a building under construction (it is not my project). It is a reinforced concrete slab supported by post tensioned beams in each direction.  
The shoring is not really being removed the way I would have thought it would be based on my very limited experience with post tensioning. None of the beams have been tensioned, and the shoring has been removed from the first floor only. It was my understanding that PT beams are normally designed to balance a certain percent of the dead load, and the untensioned beams on the second floor are right now taking all the dead load on this floor plus some from the floor that is being poured at the highest level. I know there is a minimum amount of mild steel in the beams, but I wouldn't think it would be designed for this much dead load. Can anyone please explain what is going on here? What is the point of using post tensioned beams if there is enough mild steel to take all this load anyway?

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