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Diaphragm Connection

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For a masonry shear wall building with a rigid diaphragm,
is it necessary to design the shear transfer from the diaphragm
to the wall using omega level forces?  The CBC requires that
collectors have the design strength to resist omega level forces.
If a ledger channel is used to transfer shear, it would seem this is
acting as a collector and therefore required to conform to this.
And what if just dowels are used for shear transfer?  It seems
unclear as to how far you "chase" the omega level force.  Perhaps
the diaphragm's connections are exempt as they typically have a
large number of redundancies.

Mark Pemberton, P.E.
Project Engineer
Lionakis Beaumont Design Group
1919 19th Street
Sacramento, CA 95814
(906) 558-1900

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