Numerical Investigation of Diameter Effects on the Cyclic and Axial Behavior of Spun Piles
Muh. Ricki Saprollah, Ali Awaludin, Angga Fajar Setiawan
1Department of Civil and Environmental Engineering, Gadjah Mada University, Yogyakarta, INDONESIA
*Corresponding author: ali.awaludin@ugm.ac.id
INTISARI
Prestressed spun piles are widely used in deep foundation systems due to their high capacity to withstand combined axial and lateral seismic loads. Ensuring reliable performance under cyclic loading is essential for the safety and resilience of structures in earthquake-prone areas. This study presents a comprehensive numerical investigation on the cyclic behavior of prestressed spun piles with diameters of 400 mm, 500 mm, and 600 mm, considering both hollow and reinforced concrete infill configurations. A total of eighteen models were developed, incorporating reinforcement ratios of 1% and 2% in the infilled piles. Axial loads were applied at two levels, 0.08fc’Ag and 0.16fc’Ag, while lateral cyclic displacements were imposed following the ACI 374.1-05 protocol to simulate realistic seismic demands. Nonlinear structural responses were captured using fiber-section beam-column modeling techniques, calibrated against experimental data for validation. The results show that increasing pile diameter enhances the ultimate moment capacity, while only infill piles achieve a significant improvement in ductility. The findings offer valuable insights for optimizing the seismic design of prestressed spun piles.
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