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- To: seaint(--nospam--at)seaint.org
- Subject: Effective Length
- From: Roger Turk <73527.1356(--nospam--at)compuserve.com>
- Date: Mon, 8 Feb 1999 10:28:38 -0500
Chris, I consider the unbraced length of web members as being along the axis of the member from the center of the top chord to the center of the bottom chord. Actually, the points of lateral restraint (but no moment restraint) are where the roof sheathing and ceiling are nailed to the truss chord, but I am giving them (TPI et. al.) the benefit of the doubt. (I do not accept TPI's contention that the unbraced length is less than the clear length of the web member.) For chords not continuously supported laterally, I consider the unbraced length as the distance between lateral braces. In the strong direction, I consider the unbraced length to be from panel point to panel point. The effective length would be in accordance with NDS. Hope this helps. A. Roger Turk, P.E.(Structural) Tucson, Arizona Chris Towne wrote: . > Does anyone know of any good literature about determining effective . > lengths of truss members in compression? Also, any comments from . > experience would be appreciated.
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