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Plywood Shear Wall Deflection

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In calculating the deflection and the rigidity of plywood shear walls, the sample shown in Volume Two of the Seismic Design Manual includes the shrinkage effect of the top/sole plate and the floor assembly in the da calculation.  Within a building structure the loss of moisture content of wood members should be uniform and thus no differential shrinkage should occur, especially across a short shear wall (say a 6 feet wall).  It is my opinion that the wood shrinkage effect need not be considered.  Only the deformation caused by the externally applied loads should be included in the deflection calculation.
 
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Bob Chou
VCA Engineers
(714) 978-9780