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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Spring and Dashpot Coefficients for Machine Foundations on Piles
Author(s): Michael J. O'Rourke and Ricardo Dobry
Publication: Special Publication
Appears on pages(s): 177-198
Keywords: caps (supports) ; concrete piles; damping; foundations; machine bases; soil dynamics; stiffness.
Abstract:This paper presents a simplified procedure for calculating the equivalent stiffness and clamping of a pile supported machine foundation. Separate procedures are developed for the case where there is a small gap between the bottom of the pile cap and the soil surface (Gap Case) as well as the case where there is continuous contact at all times between the bottom of the pile cap and the soil (No Gap Case). The horizontal and vertical spring constants are developed using beam on elastic foundation concepts. Both material and geometric damping contribute to the dashpot coefficients. The radiation or geometric dashpots are developed from wave propagation considerations. The equivalent springs and dashpots for individual piles in the Gap Case compare well with corresponding values obtained from a dynamic finite element program.
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