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OMRF (R value)

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To the list,

I'm confused of what R value to use.  The UBC says the value of R = 4.5 while 
the 1997 Seismic Provisions, Supplement no. 2 indicates R = 3.5.  So when can 
we use R = 4.5 and when can we use R = 3.5?

Thanks in advance.

ASQ, P.E.

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