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Scissor Truss[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: seaint(--nospam--at)seaint.org
- Subject: Scissor Truss
- From: Roger Turk <73527.1356(--nospam--at)compuserve.com>
- Date: Fri, 5 Feb 1999 13:00:16 -0500
Chris, I would be very hesitant to *remove* any bracing that a truss manufacturer puts on their shop drawings. Frequently, I want more bracing than is shown. Remember, the truss fabricator and truss designer is *not* going to provide any more of anything than is ***absolutely*** necessary and if they show bracing at the peak of the lower chord, then I would believe that it is absolutely necessary. While we always think of buckling as the result of compression, buckling due to tension is also a consideration. I call it tension flange (or tension chord) buckling and it is a part of the AISC specs. If you visualize the tension chord or tension flange of a flexural member as a rubber band separated from the compression chord or compression flange by struts with frictionless pins, you know that the rubber band is going to want to shorten and one way for it to shorten is to flip sideway, i.e., tension flange/chord buckling. It is vitally important to keep the top and bottom chord/flange of trusses and beams in the same plane. Bracing the tension chord/flange is the only way to do it. A. Roger Turk, P.E.(Structural) Tucson, Arizona Chris Towne wrote: . > I am reviewing shop drawings for glulam scissors trusses for a cabin. The . > manufacturer has bracing at the peak of the bottom chord. Does anyone . > know if this is necessary?
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