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perforated roof subdiaphragms

perforated roof subdiaphragms

perforated roof subdiaphragms

(OP)
Greetings all,
I am looking for information regarding the design of roof sub-diaphragm that have several penetrations, like in a restaurant.  I have a copy of APA L350 and the "Design of Wood Structures" by Breyer, Fridley and the rest, but most of the examples are for un-penetrated roof diaphragms.  Would I be wrong in thinking that I can approach the roof diaphragm system as a series of stacked shear walls and treat the penetrated sub-diaphragm as a perforated shear wall?  Any thoughts or reference suggestions would be appreciated. Thanks.  

RE: perforated roof subdiaphragms

Can you make and post a roof plan showing the diaphragm with opening locations and sizes?  Major beam locations and roof structure would help too.

Mike McCann
MMC Engineering

RE: perforated roof subdiaphragms

CCB1,

The Engineered Wood Association (www.apawood.org) has a publication, in pdf format, Research Report 138 (Form E315) titled "Plywood Diaphragms". Appendix E of this report has a worked out example of a diaphragm with two large openings.The analysis assumes that a diaphragm with openings behaves similar to a Vieeerendeel Truss.

I hope that this helps.

RE: perforated roof subdiaphragms

(OP)
Oldpapermaker,
Thanks for the information. I appreciate it.

Msquared48,
Sorry, I don't have a sketch.  I am researching the topic for a co-worker that has "roof sub-diaphragms" listed as part of design criteria for San Diego.  The question centers around how to approach the design and what is required by the City of San Diego.  Unfortuneately they are not prompt in returning calls, hence my posting.   

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