United States Department of Transportation
i
Bridge deficiency metric refinement : longer-term planning for state and locally-owned bridges.
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2010-06-01
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[PDF-2.81 MB]
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Edition:Final report; 2008-2009.
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Abstract:The focus of this study was to devise a prioritization scheme for locally-owned bridges and to extend the planning time horizon for state-owned bridges. The inherent nature of the local and county structures prevents a direct application of the formulation described for the state solution. Consequently, a process to segregate structures based on capability and intended purpose was utilized. Each subgroup has a specific set of parameters that produces a more accurate assessment of the subgroups current condition with respect to deficiency. These subgroups are consolidated to a global deficiency list to present a single prioritized reference for all local and county structures.
The duplication of index values of multiple structures is addressed by defining a set of stringent filtering rules. This ensured that the prioritization of structures is based on their attributes instead of random positioning that occurs when ties are present. The filtering technique allows for the creation of a 5-7 year plan (250 structures) by validating the positions of structures that otherwise would be banded due to identical total scores. This single list consolidates requirements throughout the state and at all levels of utility to ensure an unbiased selection process can be executed.
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