Cantilevered Wood Diaphragm

Structural Engineering general discussion Wood Design
#1

QUESTION
I’m designing a flexible wood floor diaphragm with a deck. The deck will be having a cantilevered diaphragm because there is no shear wall below the cantilevered part of the deck. I would like to get some tips about how to approach to a condition like that. I was planning to use hold downs…
There are walls above sitting on the shown diaphragm but not at the cantilevered section.

Here is a rough sketch:

Wood1
Wood11490×1579 149 KB

REPLIES

Jayrod12
At only a 5 ft cantilever, I would make sure your diaphragm nailing has enough capacity to transfer the small portion of load into the shearwall and be done with it. It’s very long and narrow, I can’t see anything that jumps out at me as concerning.

SOURCE
https://www.eng-tips.com/viewthread.cfm?qid=437684
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#2

@Jayrod12, Thank you for being able to confirm their hunch on this project.

#3

Assuming the floor joists are continuous over SW1, I have no real concerns.

The nail couples in the decking should provide adequate diaphragm action, even without plywood. The presence of plywood would be better, if it had a waterproof surface applied.