Applicability of principle of superposition in obtaining horizontal impedance functions of pile groups under soil nonlinearity

Chandra S. Goit*, Masato Saitoh, George Mylonakis

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference Contribution (Conference Proceeding)

Abstract

The effects of soil nonlinearity on the pile-to-pile horizontal interaction factors and horizontal impedance functions of piles through model testing are investigated. Separate experiments with a solitary pile and closely spaced 3×3-pile groups with spacing to diameter ratio of 2.5 embedded in cohesionless soil, are considered. Lateral harmonic pile-head loadings in the form of accelerations with amplitudes of 0.2, 0.5, 1 and 2 m/s2 for a wide range of frequencies are reported. Results obtained from model soil-pile systems encased in a laminar shear box show that local nonlinearity and resonant behavior of soil have a significant impact on both the interaction factors and the impedance functions. Utilizing the measured values of horizontal impedance functions of a single pile and the horizontal pile-to-pile interaction factors, Poulos' superposition method is assessed in obtaining the horizontal impedance functions of the pile group. Comparisons between computed and experimentally measured values show very good agreement, suggesting that the principle of superposition is applicable under nonlinear conditions.

Original languageEnglish
Title of host publicationECCOMAS Thematic Conference - COMPDYN 2013: 4th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering, Proceedings - An IACM Special Interest Conference
PublisherNational Technical University of Athens
Pages1145-1151
Number of pages7
Publication statusPublished - 1 Jan 2013
Event4th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering, COMPDYN 2013 - Kos Island, Greece
Duration: 12 Jun 201314 Jun 2013

Conference

Conference4th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering, COMPDYN 2013
CountryGreece
CityKos Island
Period12/06/1314/06/13

Keywords

  • Horizontal impedance functions
  • Pile-to-pile interaction
  • Principle of superposition
  • Soil nonlinearity

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