Role of initial stress states in the numerical simulation of subsoil-structure interaction during earthquakes

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A series of numerical simulations of the subsoil-structure interaction observed at a few sites during the Kobe earthquake were successfully carried resulting in the initial stress states before the earthquake, behavior during the earthquake and the time dependent behavior after the earthquake of the subsoil-structure system. These results were compared with the data obtained from the in-situ and laboratory tests on the undisturbed samples taken from the sites. The importance of the initial stress states in the ground is emphasized in the numerical analysis designed based on the constitutive model developed by the head investigator. The degree of influence of the initial stress states in the grounds on the numerical results were quantitatively estimated making it possible to systematically combine the static and dynamic analyzes which have been separately developed in the past history of static and dynamic research fields.