Abstract
We propose a damage identification algorithm for story stiffness and damping factor that can be direct damage indices. The modal properties obtained by subspace identification (4SID) are utilized to derive the damage indices. The proposed algorithm is basically applicable to shear structures. In this study, a seismic isolated structure was chosen as the monitoring target. Of a seismic isolated structure, the isolation layer and superstructure are treated as separate substructures as they are distinctly different in their dynamic properties. Based on this substructure approach, damage evaluation is separately conducted for each substructure. Effectiveness of the proposed method is verified through the simulation and the experiment.
