Vulnerability Assessment of Water Distribution Networks Considering Performance Data
Publication: Journal of Infrastructure Systems
Volume 21, Issue 2
Abstract
A methodology is presented for the reliability assessment of urban water distribution networks (UWDN) on the basis of component analysis, network topology, and—most importantly—survival analysis to include the effects of a network’s past performance on its seismic and/or nonseismic reliability assessment. This study 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. This study discusses how the American Lifeline Alliance (ALA) guideline’s repair rate (RR) metric underestimates the seismic effects on the vulnerability of a network and recommends how the damaged (prior performance) and undamaged network states are included in the calculation of a pipe’s probability of failure. In essence, the proposed methodology acknowledges that the repair rate and the resulting probability-of-failure metric, proposed by the ALA guideline, utilize statistical observations from the performance of a generic UWDN whose historical nonseismic performance is unknown and improves on these metrics by introducing the utilization of localized nonseismic performance data through survival analysis. A spatial analysis is then employed to demonstrate the effects of such nonseismic performance data on the seismic network reliability.
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Acknowledgments
The work presented in this paper is part of the Nireas-IWRC research project, which is cofinanced by the European Regional Development Fund and the Republic of Cyprus through the Cyprus Research Promotion Foundation (Grant No. NEA YPODOMI/STRAT/0308/09).
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Published In
Journal of Infrastructure Systems
Volume 21 • Issue 2 • June 2015
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Aug 8, 2013
Accepted: May 12, 2014
Published online: Jul 16, 2014
Discussion open until: Dec 16, 2014
Published in print: Jun 1, 2015
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