Saturday, November 12, 2011

Re: SDS Value

The latitude and longitude option gives values for the exact site, without the max, min, & centroid associated with a zip.


On Sat, Nov 12, 2011 at 7:34 PM, William Haynes <> wrote:
I have read before that you should use the centroid, which is what I use. I will see if I can find out where I found that direction.

Will H.

On Fri, Nov 11, 2011 at 2:50 PM, Thomas Kennedy, P.E. <> wrote:
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

******* ****** ******* ******** ******* ******* ******* ***
*   Read list FAQ at:
*   This email was sent to you via Structural Engineers
*   Association of Southern California (SEAOSC) server. To
*   subscribe (no fee) or UnSubscribe, please go to:
*   Questions to Remember, any email you
*   send to the list is public domain and may be re-posted
*   without your permission. Make sure you visit our web
*   site at:
******* ****** ****** ****** ******* ****** ****** ********