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1997 UBC Section 1630.10.3 Limitations on Story Drift

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It has come to my attention on a current project that we are looking at
for a client that the building's base shear could be affected by as much
as 26% depending on the correct interpretation of the code.  Since the
1997 commentary of the blue book did not specifically address this, I
thought I would ask my fellow structural engineering community.

Section 1630.10.3 for checking building story drifts specifically
excludes the minimum base shear of Formula (30-6), but does NOT
specifically exclude Formula (30-7) used for Seismic Zone 4.  Does
anybody know the background to this particular section to know if the
intent was to exclude or not exclude Formula (30-7)? A major lateral
designing computer software program has interpreted that Formula (30-7)
is also excluded when checking drift base shear. I want to be sure they
are right.  If not, then get it fixed.

I would greatly appreciate your comments.

Thanks again,

Henry A. Gallart, S.E.
Senior Vice President
SidePlate Systems, Inc.
23422 Mill Creek Drive, Ste 215
Laguna Hills, CA 92653

tel: 800-475-2077 (USA)

tel: 949-305-7889 (Outside USA)
fax: 949-305-6395

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