Most studies on the seismic behavior of group piles have focused on the pile’s behavior under a single earthquake. However, low to moderate seismicity zones often experience multiple successive shocks. In this study, the seismic behavior of pile groups supporting a 10-story building was investigated through a series of experiments under the influence of the Kobe earthquake for three consecutive times with a time interval of 15 min. The tests conducted first involved designing and constructing a 1:20 scale model of a 10-story steel building supported by a 3×3 aluminum pile group foundation with L/D of 16. The tests were conducted on dense dry sand with 70% relative density. The results include the performance of piles and structures in terms of vertical and lateral displacements. The findings indicated that the tilting angle of the pile cap diminished gradually with the application of each subsequent earthquake, decreasing by a factor of three following the second earthquake (0.15°) and by a factor of 4.7 after the third shock (0.08°), in comparison to the initial angle (0.46°). Additionally, the residual lateral displacements observed in the 10-story building during successive earthquakes reflected a continuous decline, with the rates of reduction during the second and third earthquakes being 2.5 and 9.4 times, respectively, in relation to the first earthquake. Conversely, the residual lateral displacement measured at the pile cap exhibited a steady increase over the course of the seismic events, recording increases of 10.5 and 20 times during the second and third earthquakes, respectively, with comparison to the first earthquake.
