SIMULTANEOUS IDENTIFICATION OF STORY STIFFNESS AND DAMING FOR SEISMIC ISOLATED BUILDINGS USING SUBSPACE IDENTIFICATION AND SUBSTRUCTURE APPROACH

Abstract

We propose a damage identification algorithm for story stiffness and damping factors of a building. These values can be direct damage indices. The modal properties obtained by subspace identification are utilized to derive them. The proposed algorithm is basically applicable to any shear structure. In this study, a seismic isolated structure was chosen as the monitoring target. 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 conducted for an isolation layer. Effectiveness of the proposed method is verified through simulations and experiments.