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Re: dynamic lateral force procedure

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>This does not work well with wood frame structures.
No reason to believe it should. Wood isn't linear so figuring the dynamic 
response is harder than Chinese FORTRAN. No one knows what the damping 
should be, and the response of the structural joints is a nightmare. Hard 
enough to predict the frequency of a steel framework with FEA software 
even after you've put it on a shaker table, let alone do it with 
something like timber. I've sniffed around wondering how to figure 
fundamental frequencies for my house, and I doubt it can really be 
done--so non-linear I daresay it has no natural freuquencies. 

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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