Dynamic Analysis of Piles in Sand Based on Soil-Pile Interaction

Abstract eng:
Seismic soil-pile-structure interaction is a complex phenomenon that can affect the response of structures significantly during earthquake. Considering complexities which exist in soil-pile-structure interaction problems and the lack of theoretical bases, it is necessary to use numerical methods for analyzing soil-pile-structure interaction problems. In this research program, a three dimensional modeling procedure is carried out to study the behavior of piles under earthquake loading. Dynamic analyses were carried out on the model containing the pile and its surrounding sand. To verify the model, analyses are performed using harmonic excitation. Dynamic analyses are also carried out with KOBE earthquake record applied at the bedrock level as acceleration time histories. In all analyses it is assumed that bedrock is at the bottom of the model. The soil is modeled as an elastoplastic material using the Mohr-Coulomb failure criteria. Contact elements are used at soil-pile interface to model the gap behind the pile and the compression in front of it. The side boundaries are constrained against horizontal direction and the bottom boundaries are constrained against both horizontal and vertical directions. In addition quiet boundaries are used to eliminate the “box effect” (i.e., the reflection of waves back into the model at the boundaries). The F.E. software ABAQUS, is used for all analyses in this research program. A sensitivity analysis is performed to study the effect of sandy soil parameters on the lateral seismic behavior of pile. Bending moment and shear force diagrams together with predicted deflections along the pile are also presented in this study.

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