Geomechanics and Engineering

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Sensitivity analysis of mass ratio effect on settlement and seismic response of shallow foundation using numerical simulation

  • Kil-Wan Ko (Department of Civil and Environmental Engineering, University of Southern California) ;
  • Jeong-Gon Ha (Advanced Structures and Seismic Safety Research Division, Korea Atomic Energy Research Institute) ;
  • Jinsun Lee (Department of Civil and Environmental Engineering, Wonkwang University) ;
  • Gye-Chun Cho (Department of Civil and Environmental Engineering, Korean Advanced Institute for Science and Technology)
  • Received : 2023.05.16
  • Accepted : 2023.08.13
  • Published : 2023.09.25
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Abstract

Structural inertial interaction is a representative the effect of dynamic soil-foundation-structure interaction (SFSI), which leads to a relative displacement between soil and foundation, period lengthening, and damping increasing phenomena. However, for a system with a significantly heavy foundation, the dynamic inertia of the foundation influences and interacts with the structural seismic response. The structure-to-foundation mass ratio (MR) quantifies the distribution of mass between the structure and foundation for a structure on a shallow foundation. Although both systems exhibit the same vertical factor of safety (FSv), the MR and corresponding seismic responses attributed to the structure and foundation masses may differ. This study explored the influence of MR on the permanent deformation and seismic response of soil-foundation-structure system considering SFSI via numerical simulations. Given that numerous dimensionless parameters of SFSI described its influence on the structural seismic response, the parameters, except for MR and FSv, were fixed for the sensitivity analysis. The results demonstrated that the foundation inertia of heavier foundations induced more settlement due to sliding behavior of heavily-loaded systems. Moreover, the structural inertia of heavier structures evidently exhibited foundation rocking behavior, which results in a more elongated natural period of the structure for lightly-loaded systems.

Keywords

Acknowledgement

This research was supported by Korea Construction Engineering and Transport Development Collaboratory Management Institute (KOCED) and the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (No. 2017R1A5A1014883).

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