Seismic damage assessment using linear models

The problem of earthquake damage assessment is defined. The role of the analysis of strong motion records in damage assessment codes based on expert systems is pointed out. The behavior of some damage indices proposed in the literature is studied using numerical simulations. Global damage indices for complex structures can be computed from the optimal time variant linear model, that is fitted to recorded strong motion accelerograms. Two of these indices are proposed, and their performance is tested both on numerical simulations and on strong motion records. A program for the identification of linear structures, based on strong motion records, has been written and implemented by the authors. The theoretical and computational aspects of the identification algorithm are discussed.

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