Vulnerability Assessment of Water Distribution Networks Under Seismic Loads

A methodology is presented for the reliability assessment of urban water distribution networks (UWDN), based on component analysis, network topology and, most importantly, survival analysis, in order to include the effects of a network's past performance on its seismic and/or nonseismic reliability assessment. The chapter investigates the effects of a network's historical performance on seismic vulnerability, through the introduction of the “ Number of Observed Previous Breaks (NOPB) ” risk factor. It discusses how “ Repair Rate (RR)' ' pipe fragilities underestimate the seismic effects on the vulnerability of a network and recommends how the damaged (“prior performance”) and undamaged network states can be included in the calculation of a pipe's probability of failure.

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