An adoption of energy dissipation ratio for real-time monitoring

This research is proposed for structural real-time health monitoring of a large structure based on the identified dynamic properties from the ambient measurements. This method uses the energy transfer ratio(ETR). ETR index is estimated as the ratio of energy transfers to total energies in each mode for the non-proportional damping systems. This index is computed by the dynamic parameters, such as natural frequencies and modal damping ratios. The dynamic system identification method uses the natural excitation technique(N-ExT) with the eigen-system realization algorithm(ERA) for the estimation of the dynamic parameters. Based on this process, ETR can be extracted. This research is significant of the construction of baseline structure for the bridge damage identification, and proves the effectiveness of the proposed method for real time monitoring.