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Columns Not Part Of Lateral-Force-Resisting System

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While using UBC94 1921.7 to check the concrete columns
(not part of lateral-force-resisting system), the
subjected lateral drift is 3Rw/8 multiply the
displacement.

Question:
The displacement above (for concrete frame structure)
shall be calculated using
(1) the service seismic load (V per 1628.2.1 without
load factor), or
(2) factored seismic load (1.4 x V per 1628.2.1 )

Thanks in advance,

James Lin
IDS, Inc.


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