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Delta sub m

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Just want to find out how some of you view the displacement value
associated with special seismic load condition outlined in  the seismic
provisions equation 4-1,
1.2D + 0.5 L +omega E for OMRF, two story, R=4.5.  do you consider the
resulting deflection equivalent to delta sub M. i.e.( inelastic)???
My first reaction was to view detla s associated with with equation 12-10,
).9D +E/1.4 or .9 D -E/1.4. as elastic delta s. with corrosponding deltaM =
0.7xRxDelta sub s.  In fact the maginfication factor seems to indicate
inelastic behavior. I am concerned about the vlaue of delta sub M as
compared to allowable drift values.
Your insight is appreciated.
Samir Ghosn, P.E.
Harris & Associates
(1800) 827-4901xt 360

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