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Dynamic pile impedances for fixed-tip piles

Anoyatis, George; Laora, Raffaele Di; Lemnitzer, Anne

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Authors

George Anoyatis

Raffaele Di Laora

Anne Lemnitzer



Abstract

© 2017 Elsevier Ltd The behavior of a laterally loaded pile with fixed-tip boundary condition (i.e., displacement and rotation, are perfectly restrained) is evaluated using a recently proposed, improved Tajimi-type model. The model performance in both, static and dynamic regime is first validated against rigorous finite element solutions and subsequently compared with Winkler model results for a selected range of pile-soil system parameters. In addition, pile impedances for fixed-tip piles are compared with previously proposed impedance expressions for hinged-tip piles. Results indicate that pile tip fixity has moderate impact on the pile stiffness in rotation but show stronger influence for pile stiffness in swaying and cross-swaying. The effect of tip fixity on pile impedances diminishes when piles are longer than approximately ten pile diameters. The proposed expressions for damping were evaluated across a wide range of frequencies, and damping was found to be most pronounced in rotation across the entire spectrum of pile-soil stiffness ratios examined. Winkler based formulations from literature almost exclusively over-predict damping for fixed tip piles.

Citation

Anoyatis, G., Laora, R. D., & Lemnitzer, A. (2017). Dynamic pile impedances for fixed-tip piles. Soil Dynamics and Earthquake Engineering, 97, 454-467. https://doi.org/10.1016/j.soildyn.2017.03.025

Journal Article Type Article
Acceptance Date Mar 15, 2017
Online Publication Date Apr 5, 2017
Publication Date Jun 1, 2017
Deposit Date Apr 7, 2017
Publicly Available Date Mar 29, 2024
Journal Soil Dynamics and Earthquake Engineering
Print ISSN 0267-7261
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 97
Pages 454-467
DOI https://doi.org/10.1016/j.soildyn.2017.03.025
Keywords soil–pile interaction, lateral loading, fixed tip, dynamic pile impedances, Tajimi model, dynamics
Public URL https://uwe-repository.worktribe.com/output/896773
Publisher URL http://doi.org/10.1016/j.soildyn.2017.03.025

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