Cruz Chamorro, Andrea E.

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    Nonlinear soil–structure interaction analysis of embedded wall structures subjected to earthquake loads
    (2023-05-09) Cruz Chamorro, Andrea E.; Vidot Vega, Aidcer L.; College of Engineering; Montejo Valencia, Luis A.; Suárez, Luis E.; Ramos Cabeza, Ricardo; Department of Civil Engineering; Almodóvar Rivera, Israel
    This study evaluates how soil-structure interaction affects the behavior of seismic soil pressures in deeply embedded structures, particularly those found in nuclear power plant buildings. Two-dimensional finite element models of an embedded wall-soil system were developed in Abaqus. A total of seven selected earthquake ground motions were used in the analyses. Then, three-dimensional finite element models of embedded wall-soil systems with typical thicknesses found in nuclear power plant buildings were modeled, taking into account the interaction between soil and structure. Bonded and friction contact conditions were considered in the two and three-dimensional models to assess the impact of those conditions in the developed seismic soil pressures. Three commonly used analytical methods (Mononobe-Okabe (1926), Wood (1973), and Ostadan (2005)) were employed to compare the seismic pressure results obtained from the finite element models. Furthermore, the effect of including only one horizontal component of ground motion versus including two horizontal components was studied. The results showed that the behavior of soil pressures varies depending on the stiffness of the wall, how soil-structure interaction is modeled, and whether more than one earthquake component is considered in the analysis. Additionally, it was demonstrated that analytical methods can underestimate the magnitude of generated pressures when the flexibility of the structure and soil-structure interaction are taken into account.