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Effect of ground motion characteristics on seismic response of pile foundations in liquefying soil

Chan, AHC ORCID: 0000-0003-0042-8448, Zhang, XY, Tang, L and Ling, XZ 2017 , 'Effect of ground motion characteristics on seismic response of pile foundations in liquefying soil', in N Chouw and RP Orense and T Larkin (eds.), Seismic performance of soil-foundation-structure systems , CRC Press, United Kingdom, pp. 161-170.

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A three-dimensional Fi11ite Element (FE) analysis is carried out to investigatethe dynamic behaviour of pile foundations in liquefied soil using a fully coupled (u-p) formulation employed lo analyze soil displacements and pore water. pressures. The success of theu-p formulation is briefly discussed first, together with its application to various geotechnicalproblems. For the numerical analysis, a multi-yield-surface plasticity model is used to modelthe soil skeleton, and results obtained from the FE method are compared with centrifuge testdata which shows excellent agreement with the observed pile and soil behaviour. The effectof the nature of the earthquake on pile performance has been studied using ten earthquakerecords scaled to different acceleration levels. It is found that the acceleration amplitude ofthe earthquake ground motion has a significant influence on the pile performance in liquefyingsoil. Moreover, it can be shown that the ratio of Peak Ground Velocity to Peak GroundAcceleration (PGV/PGA) of the earthquake ground motion is a better evaluation index toestimate bending moment and displacement of the pile than predominant frequency.

Item Type: Book Section
Authors/Creators:Chan, AHC and Zhang, XY and Tang, L and Ling, XZ
Keywords: liquefaction, pile foundation, peak ground velocity, peak ground acceleration, ground motion parameters, finite element analysis, centrifuge test
Publisher: CRC Press
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Copyright 2017 Taylor & Francis Group, London, UK

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