Effects of Flexibility on Rocking Impedance of Deeply Embedded Foundation
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 130, Issue 4
Abstract
This paper presents a detailed investigation of the influence on the rocking impedance of flexible sidewalls in embedded foundations. The study focuses on vertical and cylindrical foundations embedded in a homogeneous elastic stratum. In order to anticipate the effects of the flexibility, closed-form formulae for rocking impedance are derived based on three-dimensional wave propagation theory and superposition of both the rocking and flexural movements on a single model by assuming complete bonding conditions between the soil and foundations. A function representing the effect of the flexibility is identified from the closed-form formulae, in terms of the height to radius ratio of the foundations and the ratio of the stiffnesses of the ground and foundations. The rocking impedance for a flexible sidewall differs from those evaluated under the assumption of a rigid sidewall. The applicable range of rocking impedance evaluated under the assumption of a rigid sidewall is assessed, and contours to assist in the estimation of the dynamic response of deeply embedded foundations are presented.
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Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 130 • Issue 4 • April 2004
Pages: 438 - 445
Copyright
Copyright © 2004 American Society of Civil Engineers.
History
Received: Oct 1, 2001
Accepted: Jul 2, 2003
Published online: Mar 15, 2004
Published in print: Apr 2004
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