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FW: Effective Length[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: "'seaint'" <seaint(--nospam--at)seaint.org>
- Subject: FW: Effective Length
- From: "La Count, Curt" <Curt.LaCount(--nospam--at)Jacobs.com>
- Date: Mon, 8 Feb 1999 12:33:00 -0800
Chris, Our company often gets involved in designing steel trusses and I can give you advise based on that experience. As a policy, we design all members in the plane of the truss with a K=1 and a length based on the joint to joint dimensions. Often the chords are continuous and a reduction in K might be accurate, but hardly worth the gymnastics. For out of plane stability analysis, one has to look for effective bracing points, whether it is metal deck, "x" bracing, concrete floors or bridging. The out of plane bracing needs to be evaluated very carefully for both stiffnes and strength. Several good references for truss design are the AISC Design Guide "Industrial Buldings" and the LRFD Connections manual. Even though our company designs the trusse webs for pinned conditions, we also evaluate the truss for fixity at the connections and decide whether the secondary stresses are significant. Often they are not. I hope that this is in line with your request. Curt La Count Jacobs Engineering Portland, OR. ---------- From: Chris Towne To: SEAINT List Server Subject: Effective Length Date: Monday, February 08, 1999 5:47AM Does anyone know of any good literature about determining effective lengths of truss members in compression? Also, any comments from experience would be appreciated. Chris Towne, E.I.T.
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