Lateral Impedance of Contact Pile Foundations

by Mushtaq A. Nasim, Ocean County Coll, Toms River, NJ, USA,
Michael J. O'Rourke, Ocean County Coll, Toms River, NJ, USA,

Document Type: Proceeding Paper

Part of: Dynamics of Structures


The static and dynamic lateral impedance of pile foundations for which there is continuous contact between the bottom of the pilecap and the underlying soil is investigated. A parametric analysis of finite element results for the lateral impedance of a single pile with a concentric circular pilecap on a uniform soil layer over bedrock is presented. For the range of system parameters considered, the static lateral stiffness for these single pile foundations is found to be dominated by cap-soil rather than pile-soil interaction. The dynamic lateral impedances of a single pile Contact foundation is found to vary with forcing frequency in a manner similar to that for a Mat foundation. Approximate procedures for establishing the dynamic impedance of a Contact foundation, where one knows the impedance of the corresponding Mat foundation, are presented.

Subject Headings: Pile foundations | Finite element method | Dynamic structural analysis | Parameters (statistics) | Soil analysis | Soil-pile interaction | Mat foundations | Dynamic loads

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