The behavior of a pile group under lateral static loading differs from that of a single pile due to the effect of pile spacing. Regarding dynamic loading condition, this aspect becomes more compli-cated according to the alternative of pile positions and has yet not been studied rigorously. Thus, this study aims to evaluate the pile-to-pile interaction of a 3 × 3 pile group installed in dry silica loose sand by performing a series of dynamic centrifuge tests. Group effect was analyzed by applying the multiplier co-efficients on ultimate lateral resistance and subgrade reaction modulus. Numerical simulations using the proposed coefficients were carried out to predict the seismic behavior of the pile group. Predicting the bending moment of the piles and the peak displacement of the deck showed reasonable agreement with the centrifuge test results.
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