Nonlinear Three-Dimensional Numerical Study of Pile Seismic Behavior: Effect of Pile Geometrical Parameters

Document Type : Research Article


Department of Civil Engineering, Sharif University of Technology, Tehran, Iran


Behavior of soil-pile system subjected to earthquake loading depends on many parameters. These parameters can be categorized into three main groups: geometrical parameters of pile, soil mechanical properties, and loading characteristics. The purpose of this study is to investigate the effect of pile geometrical parameters on seismic response of soil-pile system considering soil nonlinear behavior. To this aim, a set of fully nonlinear three-dimensional analyses in time domain was conducted using finite difference computer program FLAC3D. The focus of the paper is on seismic response of the floating single pile embedded in clayey soil and the parametric study was performed to investigate the effect of pile geometrical parameters on its seismic response. In order to consider soil nonlinear behavior during seismic event, an elastoplastic constitutive law was applied to the soil medium. Also, soil shear modulus reduction with the increase in soil shear strain level was simulated. Results of this study showed that an increase in pile diameter causes an increase in maximum kinematic bending moment. This increase is proportional to the pile diameter powered by a value. Also, the results showed that effect of pile length on the magnitude of maximum bending moment in pile was not significant. However, the shape of bending moment distribution diagram and location of maximum bending moment are strongly affected by pile length.


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