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Horizontal plywood diaphragms

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I have a commercial project where the architect wants to use exposed 3/4" 
plywood over exposed 4x rafters at 48" o.c. He does not want to see any 2x4's 
blockings between the rafters. Prelim calcs show maximum diaphragm shear to 
be around 150 plf. Does anyone know--- for plywood horizontal diaphragm shear 
values; if there is any place in the UBC where one can find diaphragm shear 
values for framing member spacing more than 16" o.c.?

David Lau
(long time lurker)