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Re: Deflection Criteria[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: seaint(--nospam--at)seaint.org
- Subject: Re: Deflection Criteria
- From: Rhkratzse(--nospam--at)aol.com
- Date: Fri, 24 Mar 2006 10:39:39 EST
"barring other issues" is a key phrase. I will always be haunted by seeing one of my designs many years later, in which the long glu-lam roof overhangs had sagged enough to require ugly angled downspouts to drain the far corners. And I had thought that I was pretty conservative. Fortunately that structure has been demolished, replaced by another.
In a message dated 3/24/06 6:26:49 AM, jimcarey(--nospam--at)jgsteel.com writes:
The justification I have always subscribed to for using 2x the cantilever length over 240 (or other ratio) for deflection evaluation is a curvature criterion. Under uniform load, a deflected, fixed end cantilever will have the same shape as half of a uniformly loaded simple span beam (inverted) of twice the length. If that curvature is acceptable for the simple span it will usually be OK for the cantilever, barring other issues.
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