Nonlinear soil-structure interaction effects under strong ground motions should be considered in the seismic design. This paper presents the results of cyclic loading tests for pile foundation in dry sand to investigate the nonlinearity in the pile group effects in large pile-head-displacement region, The major findings obtained from tests are summarized as follows; l) variation in pile group efficiency with increase in pile-head displacement is not large, 2) the shear forces of the front piles are remarkably larger than those of the rear piles, 3) the ratio of the shear force at pile head to the total horizontal load is affected by the yield of piles and the failure of the soil as well as the number of piles, pile location, soil density, and loading direction.
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