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nailing zones in plywood diaphragms

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I don't see why changing the nailing zones of diaphragms would be any 
different than what is done in changing the spacing of stirrups in concrete, 
or stiffeners in built-up girders, or discontinuing reinforcing steel, or 
changing cover plate sizes.  You take the closer spacing/greater capacity 
requirements out **beyond** the point where larger spacing/less capacity 
becomes adequate, and repeat as necessary.

At the point that the change is made, the closer spacing/greater capacity 
elements are already much stronger than is necessary for the force at that 
location (unless, for example, the change in shear is the result of a 
concentrated load) and the closer spacing/greater capacity elements are 
(should be) slightly stronger than is necessary for the force at that 
location.  To space nails differently on one side of a plywood joint than on 
the other side is absurd.

Strive for accuracy, and don't worry about precision!

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

Ben Yousefi wrote:

. > In many large diaphragms (i.e. tilt-ups) the nailing is divided into 
. > several zones with the nailing requirements increasing as it gets closer 
. > to the boundaries. My question is: 

. > At the transition from one zone to another, what type of nailing is
. > required? Should the edge nailing of plywood pieces that cross over the
. > transition line be:

. > 1.      The "boundary edge nailing" as required for the more restrictive
. > zone.
. > 2.      The Nailing required for "other panel edges" for the more
. > restrictive zone
. > 3.      Other

. > Please comment

. > Thanks
. > Ben Yousefi, S.E.
. >