Equivalent-linear dynamic stiffness of surface footings on liquefiable soil

Xenia A. Karatzia, George E. Mylonakis, George D. Bouckovalas

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

4 Citations (Scopus)
94 Downloads (Pure)

Abstract

The focus of the present study is upon the influence of liquefaction on the dynamic impedance (stiffness and damping) of rigid square footings resting on liquefiable soil under external harmonic loading. A three-layer soil profile, consisting of a loose liquefiable sandy layer sandwiched between two impermeable stiff clayey layers, is considered to this end. Using simplified cone models and rigorous boundary element analyses, a systematic parametric study is performed to investigate the influence of liquefaction on the dynamic impedance of the footing. Vertical, horizontal and rocking oscillations are considered in the frequency domain. The results demonstrate that for common soil, foundation and seismic excitation conditions, liquefaction in the foundation soil yields significant degradation of the dynamic spring coefficients and increases the associated damping coefficients. Based on the parametric study, regression formulae are obtained for estimating the static stiffness coefficient of rigid square footings on liquefied soil.

Original languageEnglish
Title of host publicationCOMPDYN 2017 - Proceedings of the 6th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering
PublisherNational Technical University of Athens
Pages1388-1402
Number of pages15
ISBN (Electronic)9786188284418
DOIs
Publication statusPublished - 29 Sep 2017
Event6th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering, COMPDYN 2017 - Rhodes Island, Greece
Duration: 15 Jun 201717 Jun 2017

Conference

Conference6th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering, COMPDYN 2017
CountryGreece
CityRhodes Island
Period15/06/1717/06/17

Keywords

  • Equivalent-Linear
  • Liquefiable Soil
  • Static Stiffness
  • Surface Footing
  • Three-Layer Soil Profile

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