Simplified vibratory characterization of alluvial basins |
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Authors: | Jean-François Semblat Roberto Paolucci Anne-Marie Duval |
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Affiliation: | 1. Laboratoire central des ponts et chaussées, 58, bd Lefebvre, 75732 Paris cedex 15, France;2. Politecnico di Milano, P.za Leonardo da Vinci 32, 20133 Milano, Italy;3. CETE Méditerranée, laboratoire de Nice, ERA « Risque sismique », 56, bd de Stalingrad, 06300 Nice, France |
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Abstract: | For the analysis of seismic wave amplification, modal methods are interesting tools to study the modal properties of geological structures. Modal approaches mainly lead to information on such parameters as fundamental frequencies and eigenmodes of alluvial basins. For a specific alluvial deposit in Nice (France), a simplified modal approach involving the Rayleigh method is considered. This approach assumes a set of admissible shape functions for the eigenmodes and allows a fast estimation of the fundamental frequency of the basin. The agreement with other numerical results (Boundary Element Method) and experimental ones is fully satisfactory. The simplified modal method then appears as an efficient mean for the global vibratory characterization of geological structures towards resonance. To cite this article: J.-F. Semblat et al., C. R. Geoscience 335 (2003). |
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Keywords: | earthquake site effects eigenmodes vibration resonance amplification seismic wave séisme effets de site modes propres vibration résonance amplification onde sismique |
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