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RE: FW: R-values in Seismic Provisions

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>I guess I'm now confused but, until the "non-structural" components break,
>won't they stiffen the structure?
In mechanical systems non-structural items add more mass than stiffness. 
I haven't done a two column proof of this, but I'd guess the reason is 
that they're not part of the structural load path. Again, in mechanical 
systems, it's really tough to stiffen a given structure without adding an 
offsetting mass, other than by making the member end support more 

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