Centrifuge modeling of single pile axial response subjected to near-field pulse-like ground motion in dry sand
Abstract
Abstract Near-field pulse-like ground motions (PLGM) produce high-energy, long-period velocity pulses and induce severe seismic damage to geotechnical structures, yet their effects on pile axial load transfer remain unclear. This study conducts 50 g centrifuge shaking table tests to compare the seismic behaviors of a single pile in layered dry sand under PLGM and non-pulse-like ground motions (NPLGM). Paired seismic excitation s are obtained via the Baker pulse decomposition method, and comparative tests are implemented at multiple seismic intensities. The results indicate that PLGM significantly amplifies the acceleration responses of surrounding soil and pile top and triggers obvious long-period spectral shifts and strong resonance effects. Different from the stable, uniform low-amplitude responses under NPLGM, PLGM causes intense pile–soil interface shear and irreversible plastic deformation, leading to remarkable nonlinear growth of pile-top residual settlement and highly uneven distribution of pile axial force and upper shaft resistance. Such discrepancies originate from the distinct frequency-energy distributions of the two motion types, and PLGM exhibits more pronounced adverse effects as seismic intensity increases. This study clarifies the pulse-induced pile–soil interaction mechanism, providing experimental references for near-fault pile seismic design.
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