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Maximum inelastic displacement

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Let's say I'm trying to determine the maximum inelastic displacement of a
building at the midpoint of the diaphragm.  It is a shear wall building with
a metal deck roof, therefore the diaphragm displacement is considerably
greater than the wall displacement.  
In determining the maximum inelastic displacement(Delta-m), would you
include the displacement of the diaphragm as part of the Delta-s? This total
number would then be multiplied by 0.7 and R to determine Delta-m(UBC
30-17).  This would seems odd to me since the diaphragm has little or
nothing to do with the type of lateral system.  What is an appropriate R
factor (if different) for metal deck diaphragms?
Any Ideas?
Thanks in advance
Matt Melcher, P.E.

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