Seismic structural fragilities: Proposals for improved methodology per spectral matching of accelerogram

Abstract Seismic structural fragilities are often evaluated from structural response computed by Incremental Dynamic Analysis. These fragilities may be unreliable due to inherent limitation in scaling of records. In contrast, unique records with different intensities are employed in Multiple Strip Analysis which is rational, yet computationally intensive. Proposed herein is a conceptually sound method that eliminates these limitations and results in a stable fragility estimate. Real accelerograms are intensified by spectrally matching them to Conditional Mean Spectrum of different return periods. This method has been shown applicable under synthetic records, too. Further, the proposed method is statistically efficient relative to conventional approaches.

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