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RE: dynamic foundations

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Although not meant for steady state dynamic analysis of foundations, FEMA 356, Chapter 4 (Figure 4-4) has most of the stiffness and correction factor formulas worked out as opposed to pulling these values off of the graphs.  This is great if you are trying to write a program or spreadsheet.

Thomas Hunt, S.E.

"Sherman, William" <ShermanWC(--nospam--at)>
12/27/2005 06:44 AM
Please respond to seaint
        To:        <seaint(--nospam--at)>


        Subject:        RE: dynamic foundations


As a point of clarification, the USACE document is entitled "Soil and Geology Procedures for Foundation Design of Buildings and Other Structures (Except Hydraulic Structures)".  Chapter 17 is entitled "Design for Equipment Vibrations and Seismic Loadings".  I haven't used this document before, but it should be noted that it primarily addresses the soil foundation vs the concrete foundation.

William C. Sherman, PE
(Bill Sherman)
CDM, Denver, CO
Phone: 303-298-1311
Fax: 303-293-8236
email: shermanwc(--nospam--at)


From: jkumar(--nospam--at) [mailto:jkumar(--nospam--at)]
Wednesday, December 21, 2005 10:03 PM
dynamic foundations

A good document on the subject is available on the internet from the U.S. Army Corps of Engineers entitled "Design for Equipment Vibrations and Seismic Loadings" (Document No. TM 5-818-1 / AFM 88-3).

Apparently the method is based on the work by Richart. There are some gray areas and *possibly* some typos in the document. If someone has used the document, it will be interesting to get a feedback.


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