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Nailed board diaphragm with gap between

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Nels Roselund wrote:

. > The nails pass through those gaps.  Is there a way of evaluating what that
. > gap does to the strength and the rigidity of the diaphragm?

. > For example, is there a way of adjusting the yield mode formulas of the 
. > NDS, Section 12.3.1 to find an effective nail strength?  Is there a way of
. > adjusting the nail-slip component of the diaphragm deflection calculation 
. > of Section 23.222 of the 1997 UBC?

Nels,

Do you have a copy of Technical Report 12 (TR-12)?  It is downloadable from 
the AWC web site and addresses the effect that a gap has on nail strength.

A. Roger Turk, P.E.(Structural)
Tucson, Arizona

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