Abstract
Based on the shaking table test of the liquefiable soil-piles-superstructure system, the liquefaction process and seismic failure mode of the liquefiable site with an overlying non-liquefiable soil layer, as well as the instability or damage mechanism of a low pile cap-pile group-superstructure system are analyzed by a two-dimensional finite element model. The model considers the post-liquefaction shear deformation of sand, the interface models for the pile and cap with the liquefiable and non-liquefiable soil, and the interface model between the liquefiable and non-liquefiable soil to account for the discontinuity of interface deformation. The typical calculation results, including the excess pore pressures, accelerations, displacements of soil, and bending moments of the piles, are compared with the experimental results to verify the developed models and reveal the effects of site liquefaction and the soil-structure dynamic interaction on the seismic responses and instability mechanisms of the piles-superstructure system.
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