Fragility refers to components' or structures' inherent strengths-at-failures, their capability to resist stress. Seismic fragility refers to strengths-at-failures due to earthquakes. A seismic fragility function is the probability of surviving response stress from an earthquake, often peak ground acceleration (PGA, g). Post-earthquake inspections record damages and provide data for estimating seismic fragility functions and the correlations of strength-at-failures. Correlations are required for seismic risk analyses, because stresses and strengths at failures are dependent.
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