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R-values in Seismic Provisions

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Harold Sprague wrote: 
> An R of 1 would imply an elastic response. < 
While I would agree with the above statement, I have heard some speakers on 
seismic design state that an R-value of approximately 2.0 under the 1997 UBC 
would relate to a "fully elastic response".  This does not make sense to me
can anyone explain the basis for this statement?