Kinematic and Inertial Forces of Single Pile under Dynamic Loading Using Numercial Approach-Paper

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The study examines how kinematic and inertial soil–pile interaction affects the seismic response and bending moments of a single pile. Researchers conducted 1:10-scale shaking-table tests using a pile embedded in dense dry sand, then developed a three-dimensional ABAQUS finite-element model and validated it against the experimental measurements. The model was used to investigate how soil stiffness distribution and a pile cap affect pile behavior.<br /><br />The numerical results agreed well with the measured bending moments. In the parametric study, a uniform soil elastic modulus was compared with a modulus that increased linearly with depth. The increasing-stiffness profile substantially reduced the maximum bending moment and shifted its location toward the pile tip.<br /><br />Adding a pile cap also changed the bending-moment distribution. A cap with weight had a significant effect, while a weightless cap mainly affected the moment at the pile tip and caused little change along the pile’s depth. Overall, the findings show that soil stiffness variation and pile-head conditions strongly influence the magnitude and distribution of seismic bending moments in single piles.

Keywords

kinematic soil-pile interaction

inertial soil-pile interaction

seismic response

bending moment

single pile

shaking-table tests

ABAQUS finite element model

soil stiffness distribution

pile cap

dense dry sand