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Evaluation of seismic performance of pile-supported models in liquefiable soils

Lombardi, D and Bhattacharya, Subhamoy (2016) Evaluation of seismic performance of pile-supported models in liquefiable soils Earthquake Engineering and Structural Dynamics, 45 (6). pp. 1019-1038.

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Abstract

The seismic performance of four pile-supported models is studied for two conditions: (i) transient to full liquefaction condition i.e. the phase when excess pore pressure gradually increases during the shaking; (ii) full liquefaction condition i.e. defined as the state where the seismically-induced excess pore pressure equalises to the overburden stress. The paper describes two complementary analyses consisting of an experimental investigation carried out at normal gravity on a shaking table and a simplified numerical analysis, whereby the soil-structure interaction (SSI) is modelled through non-linear Winkler springs (commonly known as p-y curves). The effects of liquefaction on the SSI are taken into account by reducing strength and stiffness of the non-liquefied p-y curves by a factor widely known as p-multiplier and by using a new set of p-y curves. The seismic performance of each of the four models is evaluated by considering two different criteria: (i) strength criterion expressed in terms of bending moment envelopes along the piles; (ii) damage criterion expressed in terms of maximum global displacement. Comparison between experimental results and numerical predictions shows that the proposed p-y curves have the advantage of better predicting the redistribution of bending moments at deeper elevations as the soil liquefies. Furthermore, the proposed method predicts with reasonable accuracy the displacement demand exhibited by the models at the full liquefaction condition. However, disparities between computed and experimental maximum bending moments (in both transient and full liquefaction conditions) and displacement demands (during transient to liquefaction condition) highlight the need for further studies.

Item Type: Article
Subjects : Civil and Environmental Engineering
Divisions : Faculty of Engineering and Physical Sciences > Civil and Environmental Engineering
Authors :
NameEmailORCID
Lombardi, DUNSPECIFIEDUNSPECIFIED
Bhattacharya, Subhamoys.bhattacharya@surrey.ac.ukUNSPECIFIED
Date : 24 February 2016
Identification Number : 10.1002/eqe.2716
Copyright Disclaimer : Copyright © 2016 The Authors Earthquake Engineering & Structural Dynamics Published by John Wiley & Sons Ltd. EARTHQUAKE ENGINEERING & STRUCTURAL DYNAMICS Earthquake Engng Struct. Dyn. 2016; 45:1019–1038 Published online 24 February 2016 in Wiley Online Library (wileyonlinelibrary.com). DOI: 10.1002/eqe.2716 This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Uncontrolled Keywords : soil liquefaction; piles; seismic performance; shaking table; winkler springs
Depositing User : Symplectic Elements
Date Deposited : 02 Feb 2016 15:43
Last Modified : 05 Jul 2017 08:01
URI: http://epubs.surrey.ac.uk/id/eprint/809831

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