Friday, November 11, 2011

SDS Value

I am doing a seismic retrofit on a CMU building in Los Angeles. The owner is
in the process of selling the property and the buyer is hiring another
engineer to review the retrofit plans. When determining the Seismic
Coefficients from the USGS's software, the company I work for has always
used centroid value for the SDS (Not the Maximum or minimum). Does anyone
know anywhere in the 2011 LABC or 2010 CBC or ASCE code where it states if
you are required to use the centroid value, the maximum value or the minimum


Thomas Kennedy, P.E.

Erstad Engineering, Inc.
3463 Oceanview Blvd
Glendale CA 91208
PH: 818-249-8400
Fax: 818-249-8405

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