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Two different way of assessing seismic vulnerability are available nowadays:observed or empirical and calculated vulnerability assessment methods. Thefirst methods are based on observed damage after earthquakes correlated withthe structural properties of buildings, whereas the second methods are based onnumerical models more or less representing the buildings. In both cases, thetrouble is the imperfect knowledge of existing buildings. We propose here a newmethod for estimating the vulnerability based on experimental modal parameters(resonance frequencies, modal shapes and damping ratio) estimated under ambientvibrations. They allow to build up a simplified numerical model of the elasticbuilding behaviour. The motion produced by numerous earthquakes leads todetermine its first damage level and therefore its vulnerability. Aninter-story drift threshold based on HAZUS values defines the first damagelevel of the building. This method is applied to the Grenoble (France) city inwhich 60 buildings have been instrumented.

Analyse de vuln\'erabilit\'e sismique \`a grande \'echelle par utilisation des propri\'et\'es dynamiques exp\'erimentales des b\^atiments