A pile foundation in a soft ground will usually be subjected to lateral cyclic loading during an earthquake. In a major earthquake, it is reasonable to think that the mechanical behavior of a pile foundation and the surrounding ground is nonlinear.In the limit state design method of a pile foundation, it is very important to clarify the mechanical behavior of pile foundations subjected to lateral cyclic loading up to an ultimate state. In this paper, a new beam theory is propose for RC material. It is based on a weak form in which the axial-force dependency in the nonlinear moment-curvature relation is considered. Then, real scale field tests are simulated on a 9-pile foundation using a three-dimensional elastoplastic finite element analysis (DGPILE-3D). Each pile has a diameter of 1.2 m and is subjected to cyclic lateral loading up to the ultimate state. Meanwhile, the ground soils are simulated with tij-clay model and tij-sand model. The purpose of the paper is to provide an applicable numerical way of evaluating the mechanical behavior of a pile foundation subjected to cyclic lateral loading up to the ultimate state.
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