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Influence de la variabilité spatiale en interaction sismique sol-structure

Abstract : Classical analysis of seismic soil-structure interaction phenomena for the design of civil engineering structures and lifelines are based on two simplifying assumptions~: lateral homogeneity of the soil underneath the foundation and representation of the ground motion (free field) as a pulse train of vertically or obliquely incident plane waves. For large structures founded on flexible spread footings, these hypotheses are not valid any longer. Furthermore, data recorded after the installation of dense seismograph arrays have shown that seismic ground motions can have a strong spatial variability, even over short distances and irrespective of deterministic wave passage effects. We develop in this thesis some theoretical tools for the modelization and numerical analysis of the influence of the free field and soil spatial varibilities on the structural response. A probabilistic approach is chosen, and the structural response of interest is given by an integral formulation which considers these two aspects simultaneously. Relevancy of numerical implementations are enhanced by introducing a spectral reduction of the random dimension of the fluctuating part -- large or small -- of the uncertain soil mechanical parameters through its Karhunen-Loeve expansion. This technique is applied to the free field as well. The numerical results obtained for various realistic cases display some specific features whose consideration seems essential in the process of industrial design. Notably, some usefull trends and sensitivity of the structural response with the free field and soil spatial variabilities are derived.
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Contributor : Eric Savin <>
Submitted on : Wednesday, August 4, 2004 - 2:29:05 PM
Last modification on : Monday, November 30, 2020 - 4:56:04 PM
Long-term archiving on: : Friday, April 2, 2010 - 8:48:03 PM


  • HAL Id : tel-00006636, version 1



Eric Savin. Influence de la variabilité spatiale en interaction sismique sol-structure. Matériaux. Ecole Centrale Paris, 1999. Français. ⟨tel-00006636⟩



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