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Re: Ridge beam/joist analysis

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What?  Unless I'm not paying attention, the connection at the ridge is pinned, isn't it?  As has been noted, a standard analysis package will show that for any collar tie not "close" to the eaves, there are huge moments in the rafters and the connection to the collar tie is also large.  These are theoretical, but the consideration of unbalance snow loads will also mess up the assumptions.
 
That this "works", only highlights the fact that there are other redundancies at  play?

Thor A. Tandy P.Eng
Victoria BC
Canada
email: vicpeng(--nospam--at)telus.net
----- Original Message -----
Sent: June 30, 2004 2:09 PM
Subject: Re: Ridge beam/joist analysis

Daryl,
The collar tie is the tension member at some distances d from the
compression stress (max at the top of the ridge) that forms a couple and
thus moment transfer. Making the two rafters act as a continuous beam over
the ridge support......................