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RE: Overturning under sesimic load

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I associate "R" with energy dissipation capacity of the materials in the
structure...in the sense that the force that would cause overturning will be
greatly absorbed by the ductility of the structure above the foundation.
i.e. a very stiff (low R value) structure is more likely to tip rather than
bend.

Eli Grassley
PSM Engineers
Seattle


-----Original Message-----
From: Zhoub002 [mailto:zhoub002(--nospam--at)hawaii.rr.com] 
Sent: Wednesday, August 25, 2004 1:38 PM
To: Sherman, William
Subject: Overturning under sesimic load


I don't understand why the building code like UBC 1997 allows reduced
seismic load (i.e. 1/Rw) to be used for evaluating overturning. "Rw" is
a coefficient associated with ductility, but I can't imagine a
"ductile" overturning.

Ben Z.




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