Impact of uncertainties on the translation of remaining pipe wall thickness to structural capacity

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ConferenceINFRA 2004 Urban Infrastructure: Managing the Assets, Mastering the Technology: 15 November 2004, Montreal, Quebec
Pages116; # of pages: 16
Subjectjointed water mains, Winkler model, pipe-soil interaction, elasto-plastic soil; Pipes and pipelines
AbstractDrinking water distribution systems form essential components of most urban centres. Water mains (or pipes) buried in the soil/backfill are exposed to different deleterious reactions and as a result, the design factor of safety may significantly degrade, leading to structural failure. In particular, metallic distribution and trunk mains are subject to corrosion. Proactive pipeline management, which entails timely maintenance, repair andrenovation, can increase the pipe service life. Several non-destructive evaluation (NDE) techniques have recently become available to measure the remaining wall thickness of metallic pipes. In this paper, an analytical model based on Winkler-type pipe-soil interaction (WPSI) is used to translate the remaining pipe wall thickness to current structural factor of safety. The WPSI model takes into consideration external (traffic, frost, etc) and internal (operating and surge pressures) loads, temperature changes, andloss of bedding support as well as the reduction of pipe structural capacity in the presence of corrosion pits. Uncertainties in the input data/parameters are handled using possibility theory and fuzzy arithmetic. Sensitivity analysis is carried out to identify the critical data/parameters that merit further investigation.
Publication date
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
NRC number47627
NPARC number20377650
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Record identifier66648196-5b4a-493e-8580-44c40260413d
Record created2012-07-24
Record modified2016-05-09
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