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RE: Delta sub m

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Ben, gerard
Thanks
At 01:29 PM 8/19/2002 -0700, you wrote:
>Samir
>
>The special loading conditions that you refer to, are only for stress check
>of critical elements, which you do not want to fail during strong seismic
>events. The drift check is only performed for basic loading conditions. 
>
>
>Ben Yousefi, SE
>san Jose, CA 
>
>
>Hi 
>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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