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Re: Eathquake & 1997 UBC

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>From the 1997 UBC seminar:
Em is the estimated max seismic force that can be developed in the
structure. It's equivalent to the forces determined from previous Code with
the amplification factor 3Rw/8.
Em is used for special seismic load comb 12-17 & 12-18. It applies to both:
ASD & LRFD and  must be used for critical structural elements such as those
supporting discontinuous systems (1630.8.2) and collector elements (1633.

Julio M. Guerra SE