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RE: pre-fabricated building

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The process of calculating the amount of sag relative to the stretch in a tie beam is pretty straight forward.  Normally, it is not an issue especially when compared with the deflections and drifts in a pre-engineered metal building.  If you have a significant pitch to the roof, the stretch in the tie should provide minimal contribution to the sag in the roof. 
If pre-tensioning is still required (and if you are using a rod for a tension brace) use a hydraulic tensioner like the Biach.  The rods will have to have the couplers detailed and set in windows that can allow the stretch and then be filled with grout later.
If you are using PT strand, just use a PT hydraulic ram.  You will have to size your strand so that you can provide sufficient force to set the wedges.  You may have to use a window on the opposite side of the foundation to properly set the wedges.  Setting the wedges properly will be the biggest issue using PT strand.

Harold Sprague

To: seaint(--nospam--at)
Subject: pre-fabricated building
Date: Mon, 4 Feb 2008 08:02:52 -0500
From: domdean(--nospam--at)

I am in the process of designing the foundations for a pre-engineered building which will house soccer fields. The width of the building is 210 feet and the horizontal force is 167 kips. I wanted to use tie rods for the tension force and pretension them to approximately 25 kips. Is this feasible and, if so, how would the contractor be able to verify the tension? This is my first building with this magnitude of horizontal force and any help would be appreciated.

Domenic DeAngelo P.E.

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