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R=4.5 or 5.5

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A concrete building, concrete roof, concrete beams
(both directions), interior concrete columns, concrete
perimeter shear walls but with NO concrete, (meaning
concrete beams at the last bays were supported by
concrete perimeter walls directly). 

Per UBC97, R=4.5 or 5.5?

Thanks in advance,

James Lin
IDS, Inc. 
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