Bridge health monitoring metrics : updating the bridge deficiency algorithm.
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2009-10-01
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Alternative Title:UTCA theme : management and safety of transportation systems
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Edition:Final report; Aug. 2006-Sept. 2007
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NTL Classification:NTL-HIGHWAY/ROAD TRANSPORTATION-Bridges and Structures;NTL-HIGHWAY/ROAD TRANSPORTATION-Design;
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Abstract:As part of its bridge management system, the Alabama Department of Transportation (ALDOT) must decide how best to spend its bridge replacement funds. In making these decisions, ALDOT managers currently use a deficiency algorithm to rank bridges that are the most deficient and in need of replacement. The current algorithm is outdated and needs to be revised to reflect modern bridge performance criteria.
UTCA researchers established a new set of performance criteria that reflect modern ALDOT practice, set performance goals for each criterion, and assigned importance factors to the criteria. The updated bridge deficiency algorithm was evaluated by comparing lists of bridges ranked in order of decreasing deficiency against the judgment of experience division bridge inspectors, the 194 bridges selected for replacement in the 2007 through 2011 bridge replacement program, and a similar list produced by the 1991 deficiency algorithm.
The lists of deficient bridges produced by the new algorithm showed excellent agreement with each of the above. This new bridge deficiency algorithm would be an asset to ALDOT in developing standardized budget planning across the range of bridge treatments: preventive maintenance, rehabilitation, and replacement.
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