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RE: Wood "Nailed" Moment Connection

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Robert,
Contact APA Engineered Wood Assn. Help Desk (help(--nospam--at)apawood.org) and ask for a copy of an older APA Report on wood joist floor system where joists cantilvered across center support and were connected with nailed plywood splice plate (at end joint) to adjoining joists, to create a continuous joist system.  This joint is a moment resisting joint and the splice plate was located where shear was zero (like the condition you describe).  The report describes how to design this joint.  Basically, you need to design based on the NDS allowable lateral loads of the nails and their moment resistance about the centroid ot the nail group; the design is simpler if the nails are located in a circle around the centroid, e.g. all nails equidistant from the centroid, thus equally loaded.  However, I would be surpirsed if the "as-built" connection in your application is structurally adequate.
John Rose
APA-Retired
Tacoma, WA
 
----- Original Message -----
From: Robert Rogers
To: seaint(--nospam--at)seaint.org
Sent: 5/14/2003 1:39:12 PM
Subject: Wood "Nailed" Moment Connection

I'm sure many of us have seen wood beams that have been "scabbed together".  I have a rather unique situation where two rafters are sloping gently (about 1/2" per foot) to the peak of a low-slope roof and are nailed together (at the peak) with some nails & plywood "scabs" on either side.  There is no ridge beam, and the total span is about 18 feet (two 9 foot rafters abutting each other at the peak).  I have tried to envelope the analysis by considering it as a simple beam (with max. moment and no shear) as well as it being a rigid frame (nailed down at each end) inducing shear, moment, and axial compression into the rafters. 
 
Problem is, I have been unable to find any information about "nailed" moment connections.  Nothing in AITC, nothing in Breyer's book (4th Edition) and nothing after scouring the net......
 
Anybody out there who can enlighten me on this subject matter (transferring moment via a nailed "scabbed" connection) ?
 
Thanks in advance,
 
Robert Rogers, PE
 
 
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