AbstractA three‐dimensional formulation based on Green's functions of cylindrical loads in layered semi‐infinite media is employed to investigate the dynamic behaviour of piles in homogeneous and non‐homogeneous half spaces. The pile‐soil‐pile interaction taking place in pile groups is incorporated in the model. The results presented in this paper include the dynamic stiffnesses and dampings of single piles as well as those of representative 2 × 2 and 4 × 4 square pile groups in the soil media considered in this study. In addition, the distribution of forces applied on the pile cap among the individual piles in a group is i
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