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Re: Plywood rigid diaphragms

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The rigid diaphragm suggestion was mentioned in two papers. One provided by
Kelly Cobeen and the other by Ed Diekmann. There was no design guide lines
provide only the mention that the diaphragms should be considered as rigid.

They are citing the 1997 code section 1630.6 and the 1994 code section 1628.5 

Again this was only mentioned as the method to be used and no real design
examples or other information regarding stiffness calculations were provided. 

Dolan agreed that the small diaphragms are rigid but there limited
information available on calculation of the relative stiffness of the shear
walls.

Does any one else have any comments?

john b