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Assessing the vulnerability of a large set of buildings using sophisticatedmethods can be very time consuming and at a prohibitive cost, particularly fora moderate seismic hazard country like France. We propose here a low-costanalysis using an experimental approach to extract the elastic behaviour ofexisting buildings. An elastic modal model is proposed for the different typesof building tested in Grenoble (France) thanks to their experimental modalparameters (resonance frequencies, modal shapes and damping), which areestimated using ambient vibrations surveys. Sixty buildings of various typeswere recorded. The building integrity is then calculated considering anaccelerogram scenario provided by seismologists as input and considering anintegrity threshold based on the FEMA inter-storey drift limits. Even if thelevel of damage remains unknown, we conclude that masonry buildings undergomore damage (70% of buildings damaged) than RC buildings. Finally, extractingmodal parameters from ambient vibration recordings allows us to define, foreach class of building, its ability to support seismic deformation in case ofearthquake.

Seismic Risk Scenario in Grenoble (FRANCE) Using Experimental Dynamic Properties of Buildings