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Re: Wood: 'en' and Plywood question.

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In racking tests on plywood panels that I observed in 1984, failure appeared
to be mostly in the nails pulling out of the substrate framing.  There was
also a dominant failure mode in which the head pulled through the sheathing
if the surface lamination was damaged by overdriving the nail.  The nail
head was then more likely to pull all the way through the sheathing,
especially gypsum board when the paper was penetrated by the nail head.
Plywood was also affected by this since the inner laminations were of lower
quality than the surface laminations.  There were no OSB panels in the test
series.  I think that it may be covered in a Research Report by Mike Oliva
published by the Earthquake Engineering Research Center at UC Berkeley.
There were some tests on single and double sided panels at the time, but I'm
not sure those results were published.

Pat Quinn
Henderson, NV

----- Original Message -----
From: <Seaintonln(--nospam--at)aol.com>
To: <seaint(--nospam--at)seaint.org>
Sent: Wednesday, July 14, 1999 9:01 PM
Subject: Wood: 'en' and Plywood question.


> 1) I know this is an elementary, but I want to make sure I have it right.
If
> you sheath both sides of the wall using the same nail pattern (who
wouldn't?)
> do you reduce the nail capacity in half?
>
> For example if you have 8d at 6" on the edge on one side, the capacity per
> nail is v*(6/12) per nail. However, if both sides are sheathed with 8d at
6"
> o.c. is the capacity per nail v*(6/24) ?
>
> 2) What thicknesses of plywood and OSB are commonly used for shearwalls. I
> always specify 15/32" 5-ply (struct I) panels but understand that some use
> 3/8 or 1/2". With all of the choices for plywood's to determine wall
> deflections, which panels should I be considering for common use in all of
> the area's of the US (since the program calculates wind loads as well).
>
> I forgot to take this into consideration on my spreadsheet program and
need
> to add it. Any advice would be appreciated.
>
> Thanks
> Dennis
>