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Influence of Nonlinearities on the Vertical Kinematic Interaction of Piles

- Numerical investigations to obtain the kinematic response of piles in soil under vertical dynamic loading using three-dimensional finite element modelling were carried out in the time domain. A numerical model was validated against the available solutions for end-bearing single piles. Based on this validation, the model for floating single pile was developed. Besides the elastic assumptions for soil, the effects of soil and soil-pile interface nonlinearities on the kinematic response of piles were examined. The results show that the kinematic response factors of the end-bearing single pile and floating single pile based on elastic soil match well with the available analytical/numerical solutions. The assumption of the insignificance of the soil-pile interface may hold true for end-bearing single pile with elastic soil consideration. Whereas both in cases of end-bearing single pile and floating single pile, with consideration for soil nonlinearity and the soil-pile interface nonlinearity, the kinematic interaction can increase reasonably considering piles can move easily against relatively weaker soil.