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RE:Dynamics Question

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I see some books dividing the seismic forces (produced by dynamic analysis)
by Rw. UBC section 1629.2.4.3 allows this division only for soils type S4.
Should one scale dynamic forces according to 1629.5.3 without involving
the Rw factor for buildings on soils S1,S2,&S3 ?

Tarek Mokhtar
consulting engineer