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Soil-structure interaction effects on the seismic response of a public building in Lefkas, Greece

  • S.I. : Soil-Structure Interaction Effects on the Dynamics of Structures
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Abstract

An investigation of Soil-Structure Interaction (SSI) effects on the seismic response of the Regional Administration building in the island of Lefkas, Greece is performed, based on earthquake recordings from two accelerometric stations installed at the basement of the building and on ground surface at a certain distance from the structure, representing a free-field station. The observed deviation between basement and free-field records is explored by means of a hybrid numerical—analytical formulation in the framework of the substructure approach. To this end, the kinematic part of the interaction mechanism is modeled through commonly employed analytical transfer functions between ground surface and foundation base, while a detailed 3D mass-distributed Finite Element model is analyzed under both fixed and flexible supports to explore the seismic response of the building, as affected by inertial SSI effects. The comparison between predicted and recorded response shows a kinematic dominated response of the foundation that is characterized by strong filtering of the free-field motion at ground surface. Accordingly, various repercussions due to the potential underestimation of the seismic hazard from recording stations housed at the basement of buildings are discussed. Numerical results demonstrate also that soil compliance may have an important effect on the seismic demand quantified in terms of interstorey drifts of the building. Finally, a simplified MDOF lumped-mass stick model of the superstructure is also analyzed under flexible-base conditions, leading to a substantial overprediction of interstorey drifts compared to the 3D model.

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The data that support the findings of this study are available from the corresponding author, Christos Karakostas, upon reasoned request.

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Karakostas, C., Morfidis, K., Rovithis, E. et al. Soil-structure interaction effects on the seismic response of a public building in Lefkas, Greece. Bull Earthquake Eng 20, 3549–3575 (2022). https://doi.org/10.1007/s10518-021-01278-8

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  • DOI: https://doi.org/10.1007/s10518-021-01278-8

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