Location
San Diego, California
Presentation Date
30 Mar 2001, 4:30 pm - 6:30 pm
Keywords and Phrases
Pile, Stiffness, Damping, Impedance, Inhomogeneity, Winkler, Analysis
Abstract
The flexural stiffness and damping (dynamic impedance) of a single vertical pile in an inhomogeneous soil deposit with continuously increasing stiffness with depth, is studied. An analytical formulation based on the Beam-on-Dynamic-Winkler-Foundation (BDWF) model is implemented. The model is used in conjunction with a virtual work approximation and pertinent shape functions for the deflected shape of a long flexible pile, which are analogous to those used in finite-element formulations. Explicit closed-form solutions are derived for: (1) the dynamic pile stiffness; and (2) the damping coefficient at the pile head. Both swaying and rocking vibrations are considered and all associated impedance coefficients (swaying, rocking, and cross swaying-rocking) are determined. Results from the method are found to be in good agreement with earlier solutions, while new results are developed. The errors resulting from the use of an “equivalent” homogeneous profile with average properties are discussed.
Department(s)
Civil, Architectural and Environmental Engineering
Meeting Name
4th International Conference on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Publisher
University of Missouri--Rolla
Document Version
Final Version
Rights
© 2001 University of Missouri--Rolla, All rights reserved.
Creative Commons Licensing
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License.
Document Type
Article - Conference proceedings
File Type
text
Language
English
Recommended Citation
Mylonakis, George and Roumbas, Demetri, "Lateral Impedance of Single Piles in Inhomogeneous Soil" (2001). International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics. 21.
https://scholarsmine.mst.edu/icrageesd/04icrageesd/session06/21
Included in
Lateral Impedance of Single Piles in Inhomogeneous Soil
San Diego, California
The flexural stiffness and damping (dynamic impedance) of a single vertical pile in an inhomogeneous soil deposit with continuously increasing stiffness with depth, is studied. An analytical formulation based on the Beam-on-Dynamic-Winkler-Foundation (BDWF) model is implemented. The model is used in conjunction with a virtual work approximation and pertinent shape functions for the deflected shape of a long flexible pile, which are analogous to those used in finite-element formulations. Explicit closed-form solutions are derived for: (1) the dynamic pile stiffness; and (2) the damping coefficient at the pile head. Both swaying and rocking vibrations are considered and all associated impedance coefficients (swaying, rocking, and cross swaying-rocking) are determined. Results from the method are found to be in good agreement with earlier solutions, while new results are developed. The errors resulting from the use of an “equivalent” homogeneous profile with average properties are discussed.
