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During the past two decades, the use of ambient vibrations for modal analysisof structures has increased as compared to the traditional techniques (forcedvibrations). The Frequency Domain Decomposition method is nowadays widely usedin modal analysis because of its accuracy and simplicity. In this paper, wefirst present the physical meaning of the FDD method to estimate the modalparameters. We discuss then the process used for the evaluation of the buildingstiffness deduced from the modal shapes. The models considered here are 1Dlumped-mass beams and especially the shear beam. The analytical solution of theequations of motion makes it possible to simulate the motion due to a weak tomoderate earthquake and then the inter-storey drift knowing only the modalparameters (modal model). This process is finally applied to a 9-storeyreinforced concrete (RC) dwelling in Grenoble (France). We successfullycompared the building motion for an artificial ground motion deduced from themodel estimated using ambient vibrations and recorded in the building. Thestiffness of each storey and the inter-storey drift were also calculated.

soil dynamics and earthquake engineering

Dynamic parameters of structures extracted from ambient vibration  measurements: an aid for the seismic vulnerability assessment of existing  buildings in moderate seismic hazard regions