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RE: Tool for calculation of Sesimic Design Categoty (SDC) per 200 6 IBC / ASCE7-05

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Yes, it is for prelim checking at the counter [Actually to "teach" architects how to do structural engineering.]
-----Original Message-----
From: Casey K. Hemmatyar [mailto:khemmatyar(--nospam--at)]
Sent: Thursday, October 25, 2007 2:20 PM
To: seaint(--nospam--at)
Subject: RE: Tool for calculation of Sesimic Design Categoty (SDC) per 2006 IBC / ASCE7-05



Thanks for sharing your spreadsheet, I like it.

For a preliminary analysis I think it provides a quick estimate.


However, keep in mind that the "Spectral Response Accelerations Ss and S1" in your spreadsheet represent the highest values whithin the given zip code, which result in highest "Seismic Response Coeffecient" (base shear.)

I strongly suggest that for each speicific project site, the corresponding Latitude & Longitude (1) to be used. By doing so the designer will get the accurate values that can be substatially lower than the max.

And I still prefer to directly use the USGS " Java Ground Motion Parameter Calculator " (2) for the fact that it gets updated on a regular basis, and not to use a separate spreadsheet.




(1) The links for finding Longitude & Latitude by address


(2) USGS Web page

Casey (Khashayar) Hemmatyar, SE
Private email


-----Original Message-----
From: Acharya, Suresh [mailto:Suresh.Acharya(--nospam--at) ]
Sent: Thursday, October 25, 2007 12:21 PM
To: 'seaint(--nospam--at)'
Subject: Tool for calculation of Sesimic Design Categoty (SDC) per 2006 IBC / ASCE7-05


I would like to share with you an Excel spreadsheet to calculate SDC based

on ZIP codes, written for use by our staff.


Spreadsheet can be downloaded from here:


I appreciate your feedback, including any bug report.



1. Remove the .class extension after you download the file. It is an Excel

spreadsheet, works ok with OpenOffice Calc program also.

2. ZIP codes for CA only



Suresh Acharya, S.E.



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