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Re: Galvanized Box Nails and Common Nails[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: <seaoc(--nospam--at)seaoc.org>
- Subject: Re: Galvanized Box Nails and Common Nails
- From: "John Lawson" <jlawson(--nospam--at)kramerinc.com>
- Date: Mon, 11 Aug 1997 23:13:07 -0700
Michael: I believe the "galvanized" box nail equivalency was thought up before electroplating was common; thus hot-dipped shank diameters are similar to common shanks. Recent plywood shear wall tests conducted at UCI published in the SEAOC convention proceedings several years back make a good argument that non-galv. box nails exhibit stronger capacity than common nails. This is due to the failure mode of plywood shear walls being buckling plywood pulling past the nail heads. Box nails with the larger head diameter and head net surface area produce greater resistance to this failure mode. I agree with you that common nails tend to split the wood prematurely. John Lawson Kramer & Associates Structural Engineers, Inc. Tustin, CA jlawson(--nospam--at)Kramerinc.com > From: BCASE1356(--nospam--at)aol.com > To: seaoc(--nospam--at)seaoc.org > Subject: Galvanized Box Nails and Common Nails > Date: Friday, August 08, 1997 9:08 PM > > General question regarding use of common and galvanized box nails in plywood > shear walls. > > Per UBC table 23-I-K-1 you are allowed to use either common nails or > galvanized box nails for the nailing of the plywood sheathing, with no > reduction in design capacity based upon type of nail used. For each size of > nail (8d, 10d, etc.), the box nail has a smaller shank diameter than the > common nail and a smaller shear capacity (UBC table 23-I-G). Does this mean > that the plywood is the limiting factor, and if so why require the use of > Common nails which have tendancy to split wood more than the box nail. If > the galvanized box nail is allowed for shear panels per table 23-I-K-1 why is > the box nail not also included for horizontal diaphragms (table 23-I-J-2). > Does anyone have any information on this. > > Thanks in Advance. > > Michael Cochran > >
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