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RE: FW: R-values in Seismic Provisions

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In building systems, the non-structural mass and stiffness is already there
and not added. It is just not normally considered in the stiffness
calculations.

Regards,
Bill Allen

-----Original Message-----
From: Christopher Wright [mailto:chrisw(--nospam--at)skypoint.com]
Sent: Wednesday, September 16, 1998 7:57 PM
To: SEAOC Newsletter
Subject: RE: FW: R-values in Seismic Provisions


>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
effective.

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