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Seismic - Orthoginal Effects

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I am designing a concrete frame in Zone 3.  UBC (1994 - 1631.1 and 1997 -
1633) states that if the seismic axial load in the column is less than 20% of
the column capacity then simultaneous orthogonal effects do not have to be
checked.  PCA Design Notes for ACI 318-95 example on page 31-60 show that the
column capacity is based on axial load only.  Is this the correct way to
check it?  You take the column capacity with no moment (eccentricity = zero)
and if the seismic load is less than 20% of this you do not have to check
simultaneous seismic forces?  How does column slenderness affect this check?



Richard Lewis, P.E.
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