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RE: dynamic lateral force procedure

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>I have found
>there is an advantage in using dynamic analysis for buildings greater than
>about 12 or 14 stories since you can reduce your overturning moments.
The overturning moments that actually exist or the overturning moments 
that go into stress summaries. I think there's a big difference, and 
having done a fair amount of modal analysis, I doubt that anyone really 
knows what the difference is.

No question it's a far better model of what probably happens than static 
analysis. But I've also done some experimental correlation, and for real 
structures normal mode theory really leaves a lot to the imagination. And 
it requires a pretty thorough understanding of dynamic response 
mechanisms to make full use of.

Christopher Wright P.E.    |"They couldn't hit an elephant from
chrisw(--nospam--at)        | this distance"   (last words of Gen.
___________________________| John Sedgwick, Spotsylvania 1864)

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