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The purpose of the present paper is to analyse the behaviour of a flexible pile foundation versus a rigid one when submitted to lateral cyclic action coming from waves or wind, through numerical modelling using 3D finite elements. The comparison elements are: the maximum pile head displacement and the evolution of the maximum bending moment. The numerical modelling has been performed using the software CESAR-LCPC [1]. The study has been performed for 15 cycles, but the numerical model has also served to create som...