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Re: Wood: 'en' and Plywood question.

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I witness a similar test where the nails along the top plate literally
"unzipped" until the studs were holding in bending.   About half the height
on the studs came undone!  Since then I worry that the top row of nails may
be insufficient.  Test was carried out at Univ BC and may have been a
"mistake"?  Likewise I saw no publication of the results!

Thor Tandy  P.Eng  MCSCE
Victoria BC

-----Original Message-----
From: Patrick F. Quinn <quinnair(--nospam--at)>
To: seaint(--nospam--at) <seaint(--nospam--at)>
Date: Thursday, July 15, 1999 6:33 AM
Subject: Re: Wood: 'en' and Plywood question.

>In racking tests on plywood panels that I observed in 1984, failure
>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
>not sure those results were published.
>Pat Quinn
>Henderson, NV