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Large-scale seismic vulnerability assessment methods use simplified formulasand curves, often without providing uncertainties. They are seldom compared toexperimental data. Therefore, we recorded ambient vibrations and estimatedmodal parameters (resonance frequencies, modal shapes and damping) of 60buildings in Grenoble (France) of various types (masonry and reinforcedconcrete). The knowledge of resonance frequencies in the linear domain isessential in the seismic design. Hence, we compared resonance frequencyformulas given in the design code with this experimental data. The variabilityis underestimated and only two parameters (type and height of the building)seem to be statistically significant. Moreover, we compared the linear part ofcapacity curves used in European Risk-UE method to the measured frequencies.The variability is still very large and these curve are often not relevant forthe French buildings. As a result, ambient vibration recordings may become aninteresting tool in order to calibrate the linear part of capacity curves.

Comparaison entre calculs de vuln\'erabilit\'e sismique et propri\'et\'es dynamiques mesur\'ees