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Modeling of Unbounded Domain in Seismic Soil-Pile Structure Interaction
The effects of Soil-Pile-Structure Interaction (SPSI) on the seismic behavior of bridges, dams and critical buildings are of paramount important in their seismic design. SPSI typically elongates the structural periods and degrades soil stiffness. Using a three-dimensional finite element model of a structure supported on pile foundations coupled with a nonlinear soil model provides an accurate method for assessing the seismic effects on bridges (piers), dams and critical buildings (hospitals/critical facilities). Nonlinear analysis using the Drucker-Prager soil model is performed in the time domain. The results obtained using a coarse mesh as well as a fine mesh are compared in order to verify the appropriate mesh size. To minimize the reflection of propagating waves back into the model, this paper also examines an infinite element "quiet" boundary condition and a viscous damper boundary condition, respectively. Both harmonic and El Centre seismic excitations are considered. The proposed model is validated against existing results of elastic analysis. This paper studies the effects of boundary conditions on the seismic analyses and hence the performance of the piles and superstructures. This study shows the consideration of radiation condition of the soil in seismic SPSI is significant and that appropriate boundary conditions are necessary to obtain accurate results.
Modeling of Unbounded Domain in Seismic Soil-Pile Structure Interaction
The effects of Soil-Pile-Structure Interaction (SPSI) on the seismic behavior of bridges, dams and critical buildings are of paramount important in their seismic design. SPSI typically elongates the structural periods and degrades soil stiffness. Using a three-dimensional finite element model of a structure supported on pile foundations coupled with a nonlinear soil model provides an accurate method for assessing the seismic effects on bridges (piers), dams and critical buildings (hospitals/critical facilities). Nonlinear analysis using the Drucker-Prager soil model is performed in the time domain. The results obtained using a coarse mesh as well as a fine mesh are compared in order to verify the appropriate mesh size. To minimize the reflection of propagating waves back into the model, this paper also examines an infinite element "quiet" boundary condition and a viscous damper boundary condition, respectively. Both harmonic and El Centre seismic excitations are considered. The proposed model is validated against existing results of elastic analysis. This paper studies the effects of boundary conditions on the seismic analyses and hence the performance of the piles and superstructures. This study shows the consideration of radiation condition of the soil in seismic SPSI is significant and that appropriate boundary conditions are necessary to obtain accurate results.
Modeling of Unbounded Domain in Seismic Soil-Pile Structure Interaction
Chu, Dongmei (author) / Truman, Kevin Z. (author)
Sixth U.S. Conference and Workshop on Lifeline Earthquake Engineering (TCLEE) 2003 ; 2003 ; Long Beach, California, United States
2003-07-24
Conference paper
Electronic Resource
English
Modeling of Unbounded Domain in Seismic Soil-Pile-Structure Interaction
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