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CSA S304.1-94

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A question for those with the masonry design standard noted in subject line. 
Equation gives effective stiffness of a wall to be

         ( Mcr 3 )          (         (  Mcr  3 ) ) 
 I =     --------   Io   +  (  1  -    ---------  )   I cr
         (  Ma   )	    (         (   M a   ) )

BTW courier font

My question is... is the value of 3 a cubed function or what? It appears to be just a 3 multiplier but it would probably make more sense as a cubed.
Is the equivalent US code equation anything like this. 

David Handy, P.Eng
The Thompson Rosemount Group