Re: Beam Splices[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: seaint(--nospam--at)seaint.org
- Subject: Re: Beam Splices
- From: richard lewis <rlewistx(--nospam--at)juno.com>
- Date: Wed, 11 Jul 2001 17:11:13 -0500
Locating the beam splice where the moment is zero is really an arbitrary place. Actually, wherever you locate a splice the moment is zero as long as you make it a shear connection splice.
AISC has the "Beam Diagrams and Formulas" for cantilevered beams (ASD pg 2-311). It is a good starting point to locate the splice. I start by using this. The idea is to try to "balance" the moments by shifting the splice points. I try to get the negative moments on a beam that cantilevers over 2 columns to "balance" if possible. Then whatever beam fits between them as a simple span. If the column line spacing is uniform then the splice points are about the same. If the column line spacing varies then the cantilever lengths are different in order to "balance" the negative moments. Theoretically you are suppose to use unbalanced live loading to design the beams which shifts the point of zero moment around on a continuous beam line. That's why it is really not worth trying to find the theoretical location, just force the zero moment by putting a splice there. In snow regions I use a 50% unbalanced live load to account for blowing wind and shifting snow. That's a personal preference.
On Wed, 11 Jul 2001 14:24:14 -0500 "Alden Manipula" <amanipula(--nospam--at)novagroupinc.net> writes:
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