Influence of Nonlinear Behavior of Pile-Soil Structure on Displacement Amplitude Dependence for Efficiency of Pile Group Based on Cyclic Lateral Loading Tests Subjected to Large Displacement Amplitude

Abstract eng:
The cyclic lateral loading tests for the pile group in dry sand subjected extremely large displacement were conducted to investigate the mechanism of the strong nonlinear behavior of pile-soil structures which is not considered in Japanese seismic design. Furthermore, elastic-plastic 3-D finite element analyses, in which the pile and the soil were assumed to have the plastic characteristics and the contact boundary condition was considered between the pile and the soil, were performed to obtain better understanding of the tests results. In this paper, the applicability of 3-D finite element analyses is presented by comparing the calculated analysis results with the observed test results, and then the influence of the nonlinear behavior of the pile-soil structure on the amplitude dependency of the effect of pile groups is discussed by parametric study with 3-D finite element analyses. It is shown that the analyses can simulate the lateral resistance behavior of pile groups by taking the material nonlinearity of the pile and the soil into account.

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