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Re: Openings in Roof Diaphragm

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The APA (American Plywood Association) Research Report 138 by Tissell & Elliot
does provide an example of a wood diaphragm with openings.  Also check ATC-7
Guidelines for The Design of Horizontal Wood Diaphragms for discussion and
Although, they are limited to wood, the concept is the same as far as the
analysis goes.  The diaphragm is analized as a vierendeel truss with
inflection points at the midlength of the web chords.
I hope this helps.
Tom Jakaby, SE