Site-City Interaction through Modifications of Site EffectsReportar como inadecuado

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1 LCPC-MSRGI - Division Mécanique des Sols des Roches et de la Géologie de l-Ingénieur 2 LAMSID - UMR 8193 - Laboratoire de Mécanique des Structures Industrielles Durables 3 LGIT - Laboratoire de Géophysique Interne et Tectonophysique 4 Laboratoire Régional des Ponts et Chaussée de Nice

Abstract : The analysis of seismic site effects generally disregards the influence of surface structures on the free field motion in densely urbanized areas. This paper aims at investigating this particular problem called site-city interaction especially by comparison to the -free-field- amplification process. Several evidences experimental, analytical, numerical of the site-city interaction phenomenon have been given in previous work Guéguen, Bard, Semblat 2000. The influence of site city-interaction could be large for structures having eigenfrequencies close to that of the surface soil layers. Furthermore, the density of structures is also an important governing parameter of the problem. Considering a specific site Nice, France where site-city interaction is supposed to be significant, we start from detailed experimental and numerical studies of seismic site effects giving both amplification levels and occuring frequencies, as well as the location of the maximum amplification areas. The influence of site-city interaction is then investigated through various numerical models considering the boundary element method. The effect of surface structures with variable urban densities is analysed to estimate the contribution of overall site-city interaction on surface motion distribution. The main goal of the paper is to estimate the influence of site-city interaction not only on amplification levels the influence can be small, but also on the modification of both main amplification frequencies and location of the maximum amplification areas. The main conclusion of this work is to show the modifications of the free-field amplification due to site-city interaction and leading to a specific urban field amplification.

Keywords : seismic waves ground motion soil-structure interaction city effect alluvial basin boundary element method

Autor: Jean-François Semblat - Marc Kham - Philippe Guéguen - Pierre-Yves Bard - Anne Marie Duval -



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