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Re: Wood structure with wood diaprhagm - question on disconntinuity[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: seaint(--nospam--at)seaint.org
- Subject: Re: Wood structure with wood diaprhagm - question on disconntinuity
- From: SDGSE(--nospam--at)aol.com
- Date: Fri, 1 Oct 1999 02:02:16 EDT
In a message dated 9/30/1999 5:19:16 PM Pacific Daylight Time, Seaintonln writes: << One questions, what would be the difference in the chord design if the roof had been simply flat. Isn't it the same as the maximum moment divided by the depth of the diaphragm (net) - or is there additional deflection expected due to a discontinuity that might exist at the junction of the two roofs? >> Dennis: In practical terms, there wouldn't be a difference. you would calculate the chord forces the usual way. However, you need to have a continuous chord (blocking & strap or a continuous member at the top plate line of the flat roof within the wall of the sloped roof, all the way to the end. Just don't let the shape of the roof scare you as long as you follow your "principal of mechanics" instinct. You can also experiment with the model I described in my earlier post by adding chord members and see the stiffness the provide. The trick is that the stepped roof will try to balance itself under the lateral load into a flat shape. To prevent this you need to provide an alternate path (i.e., a chord at the flat roof level) all the way to the end of the sloping roof. Regards, Oshin Tosounian, S.E.
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