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RE: pre-fabricated building[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: <seaint(--nospam--at)seaint.org>
- Subject: RE: pre-fabricated building
- From: Harold Sprague <spraguehope(--nospam--at)hotmail.com>
- Date: Mon, 4 Feb 2008 17:54:28 +0000
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.
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