Seismic structural health monitoring using the modal assurance distribution

Thanks to emerging techniques in the field of signal processing and due improvements smart sensing systems which enable event-triggered acquisition high-fidelity data at occurrence strong ground motion events, seismic structural health monitoring has grown considerably last few decades. In this paper, modal assurance distribution, an alternative time-frequency representation features multivariate multicomponent signals, is extended for application short-term nonstationary vibrational responses system may manifest its nonlinear behavior. A general procedure extraction decoupled normal modes presented, allows identification instantaneous parameters order investigate detail behavior during earthquakes. Valuable information that cannot be recovered by means traditional criteria can thus exploited accurate damage assessment. The results obtained two case studies consisting a numerical model with softening full-scale experimental reinforced concrete benchmark show potential applicability method proposed integrity assessment civil structures.