Numerical Modeling of Soil-Pile-Interaction with Near and Far Field Earthquake's Effects
Abstract: This paper studies
Near and Far Field effects of the response of a column-pile to earthquakes
considering Dynamic-Soil-Structure-Interaction (DSSI) effects in soft clay (Vs<180
m/s ) and stiff clay (180<Vs<375 m/s). Opensees software that can
simulate the dynamic time history analysis is used. Both kinematic and inertial
interactions are considered and Finite Element Method (FEM) is used to solve
DSSI. The direct method applies to 3D modeling of the layered soil and
column-pile. A Pressure Independ Multi Yield Surface Plasticity Model is used
to simulate different kinds of clay behavior.
Time history seismic analyses provide for the mass and stiffness
matrices to evaluate dynamic structural response with and without directivity
effects for Near and Far Field earthquakes. Results show that the
Multi-Yield-Surface-Kinematic-Plasticity-Model can be used instead of bilinear
springs between piles and clay soil, for both Near Field and Far Field
earthquakes. In addition, comparing Near and Far Field analyses, acceleration
response spectrum at the top of the structure in the Far Field increases with
the softness of the soil more than that in the Near field.
Keywords: Dynamic Soil-Structure-Interaction;
Multi Surface (Von Mises) Plasticity Model; Opensees; Near Field and Far Field
Earthquake; Soft and Stiff clay
Author: Mohammad Shahmohammadi
Mehrjerdi, Ahmad Ali Fallah, S.T. Tabatabaei Aghda
Journal Code: jptsipilgg170010
