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UBC'97 "Elements, nonstructural, equipment"

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Yes and no. The dynamics of the element are considered, but not the
supporting structure.

If it is rigid (T < 0.06 sec) the force is half that if it is non rigid
(t>0.06 sec). This accounts for some dynamic interaction.

Dynamic amplification is already assumed in 1632. For example, the same
structure would have less base shear if it were an independent item where
it would be designed per 1634.

Peter Higgins, SE (member SEAOSC non building structures seismology
committee, 1985-1998).