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Geomechanics and Engineering
  Volume 12, Number 2, February 2017 , pages 239-255
DOI: https://doi.org/10.12989/gae.2017.12.2.239
 


Nonlinear numerical analyses of a pile-soil system under sinusoidal bedrock loadings verifying centrifuge model test results
Yong-Seok Kim and Jung-In Choi

 
Abstract
    Various centrifuge model tests on the pile foundations were performed to investigate fundamental characteristics of a pile-soil-foundation system recently, but it is hard to find numerical analysis results of a pile foundation system considering the nonlinear behavior of soil layers due to the dynamic excitations. Numerical analyses for a pile-soil system were carried out to verify the experimental results of centrifuge model tests. Centrifuge model tests were performed at the laboratory applying 1.5Hz sinusoidal base input motions, and nonlinear numerical analyses were performed utilizing a finite element program of P3DASS in the frequency domain and applying the same input motions with the intensities of 0.05 g~0.38 g. Nonlinear soil properties of soil elements were defined by Ramberg-Osgood soil model for the nonlinear dynamic analyses. Nonlinear numerical analyses with the P3DASS program were helpful to predict the trend of experimental responses of a centrifuge model efficiently, even though there were some difficulties in processing analytical results and to find out unintended deficits in measured experimental data. Also nonlinear soil properties of elements in the system can be estimated adequately using an analytical program to compare them with experimental results.
 
Key Words
    complex centrifuge model test; pile foundation; P3DASS program; sinusoidal base input motion; nonlinear numerical analysis; Ramberg-Osgood soil model
 
Address
(1) Yong-Seok Kim:
Department of Architectural Engineering, Mokpo National University, 58554, Republic of Korea;
(2) Jung-In Choi:
Pangyo R&D Center, Samsung Heavy Industry, Pangyo, Bundang, Seongnam, Gyeonggi, 13486, Republic of Korea.
 

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