Page Comparison

\\

The majority of [damping|kb:damping] for a massive foundation block would be from radial or geometric damping provided by the surrounding soil. The effect of material damping within the foundation block itself would likely be much smaller than that of geometric damping.

When modeling soil-structure interaction with a single [link|kb:Link] object, the damping assigned on the Linear Link/Support Directional Properties menu should represent radial damping, as described in Wilson 2004, and given in units of Force-Sec/Length (Force/Velocity). The [modal|kb:Modal analysis] damping value specified through Analysis Case Data > Linear Modal History should represent the material or structural damping inherent to the foundation system itself.


h1. References

* Wilson, DrE. Edward LL. (2004). _Static &and Dynamic analysisAnalysis of Structures_. (4th ed., pp. 197). Berkeley, CA: Computers and Structures, Inc., 2004. Print.
(Chapter 16.8: Use of Springs at the Base of a Structure, page 197)
Available for purchase on the {new-tab-link:http://www.csiberkeley.com/}CSI{new-tab-link} Products > {link-window:href=http://orders.csiberkeley.com/SearchResults.asp?Cat=2}Books {link-window} page