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Re: Plywood shear panels / box nails

[Subject Prev][Subject Next][Thread Prev][Thread Next] Dennis-
My recollection is a little different. The Ficcadenti tests were done under a cyclical test protocol of his own devising.  Consequently, the nails were exposed to a substantially lower number of load cycles that the present SEAOSC/ICBO protocol. I personally think it was probably closer to reality since the current testing produces a nail fatigue failure mode--something not reported in field investigations.  Hopefully the CUREE program will finally resolve this issue.
As I recall the results, the smaller shank produced more net bearing area under the nail head and the speculation was that it was therefore less susceptible to pull through.
Try APA Report #138 or ask Bob Kazanjy about the COLA tests at UCD. They may have some helpful information.
Ray didn't say why he was asking. I'd guess that there would be more deflection with box nails but the difference could easily be less than errors in the current analytical methods currently employed. Is someone being sued over this issue?
Chuck Utzman,P.E.
-----Original Message-----
From: RShreenan(--nospam--at) [mailto:RShreenan(--nospam--at)]
Sent: Sunday, May 20, 2001 4:31 PM
To: seaint(--nospam--at)
Subject: Plywood shear panels / box nails
Hi structural intellectuals and sport fans:

Is it reasonable to assume that box nails perform as well as common nails in
plywood shear panels within the deflection limits required by the Uniform
Building Codes prior to 1997 (.005h)?  Has there been any cyclic testing done
recently in that regard?  I have the test results done by Seb Ficcadenti and
there does not appear to be an appreciable difference but there seems to be a
difference of opinion amongst structural engineers as to whether the proper
test protocol was used in the testing procedure.  I was also told by many
that the SEAOC did not accept the results as being valid, but I don't know
for what reason.

It seems that 8-10 years ago and prior most wood framed residential projects
with plywood shear walls and diaphragms were nailed with gun nails that were
box nails.

I would like your opinions on this issue or any sources of information on
documented cyclic test results on plywood shear panels nailed with box nails.

Thanks in advance.

Ray Shreenan SE