This thesis focuses on seismic response of piles in liquefiable ground. A three-dimensional unified plasticity model for large post-liquefaction shear deformation of sand was formulated and implemented for parallel computing, based on which a three dimensional dynamic finite element analysis method for piles in liquefiable ground was developed. Through a combination of case analysis, centrifuge shaking table experiments and numerical simulations using the proposed methods, the seismic response patterns of single piles in liquefiable ground were revealed, including: basic force-resistance mode, kinematic and inertial interaction coupling mechanism and major influence factors. A beam on nonlinear Winkler foundation (BNWF) solution and a modified neutral plane solution were developed and validated against centrifuge experiments for piles in consolidating and reconsolidating ground. The axial pile force and settlement during post-earthquake reconsolidation was studied, showing pile axial force to be irrelevant of the reconsolidation process while settlement to be process dependent.

Describes a three-dimensional unified plasticity model for large post-liquefaction shear deformation of sand for parallel computing Shares many tips on and insights into the basic force response mechanism and influence factors for the seismic response of single piles in liquefiable ground Broadens our understanding of a beam on the nonlinear Winkler foundation (BNWF) method for the analysis of consolidation and reconsolidation-induced pile axial force and settlement taking the consolidation process into consideration Includes supplementary material: sn.pub/extras

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