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Water distribution systems (WDS) sustained severe damage in the pastearthquakes. While previous studies investigated the seismic performance ofburied water pipelines, the effects of corrosion on the pipeline seismicperformance were ignored. The presence of corrosion on metallic pipeline wallsaggravates seismic damage level because corrosion significantly reduces thepipeline strength. Most of the existing buried pipelines in the United Statesare aged and non-ductile metallic pipelines, which are vulnerable to seismicloading. To ensure continuous and smooth water supply to communities during andafter earthquakes, it is necessary to evaluate the system-level seismicperformance of WDS considering the aging effect in corroded pipelines. Thecurrent study develops a new framework of estimating the seismic resilience ofWDS considering the time-variant effect of corrosion. The study formulates anapproach that : (1) determines the seismic failure probability of pipelineusing an extended American Lifelines Alliance (ALA) model that account for theeffects of time-dependent corrosion; and (2) estimates system-level seismicperformance based on pipeline reliability and edge betweenness centrality. Theproposed approach is illustrated with a scenario earthquake hazard for mid-sizeWDS. The outcomes of the study reveal that the presence of corrosion onpipelines significantly reduces the system-level seismic performance of WDS.Most cast iron pipes have 100 years lifetime, system-level seismic resiliencemay decrease by 81% at high seismic wave intensity.

Time-variant Seismic Resilience Analysis Model for Water Distribution Systems