Dynamic Stiffness of Pile Groups

by Jose M. Roesset, Univ of Texas at Austin, Austin, TX, USA,

Document Type: Proceeding Paper

Part of: Analysis and Design of Pile Foundations


A number of procedures have been proposed for the dynamic analysis of complete pile foundations including group effects. Most of these introduce some sort of approximation to reduce the cost of computation. Dynamic group effects depend highly on frequency, particularly for large pile spacings. When pile spacing is of the order of five diameters or more, a number of simplifying assumptions can be used with little error. These simplified models are less accurate when dealing with closely spaced piles and dimensionless frequencies larger than 0. 5. Questions remain as to the validity of linear elastic solutions which assume perfect bonding between the piles and the soil and linear soil behavior.

Subject Headings: Piles | Stiffening | Pile groups | Spacing | Model accuracy | Soil dynamics | Soil analysis | Soil-pile interaction

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