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R value for drift calcs

R value for drift calcs

R value for drift calcs

(OP)
I am working on a bridge.  The framing in the short direction is a steel moment frame.  This sits on a concrete girder and concrete pier (forming a T on which the moment frame sits) at each end.  I was using and R value of 2.2 per 1997 UBC for cantilevered column structures.  Can I use this same value when calculating the inelastic displacement, Dm = 0.7*R*Ds?  or do I need to use the R value for a steel moment frame, R = 8.5?

RE: R value for drift calcs

Use the same R factor you used to calculate your forces.

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