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Diaphragm ratio for rigid diaphragm

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I have a garage with a concrete deck at the roof.  The garage dimensions are 24’x42’ with a 20’ opening centered at one of the 24’ end walls.  Is there a ratio limit for a rigid diaphragm which is basically open ended(the center of rigidity is within the back 24’ wall)?  This one is 1.75:1 transferring wind load to the back 24’ long wall.




Joseph R. Grill, P.E. (Structural)

Shephard - Wesnitzer, Inc.

Civil Engineering and Surveying

P.O. Box 3924

Sedona, AZ  86340

PHONE (928) 282-1061

FAX (928) 282-2058