United States Department of Transportation
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Evaluation of Missouri’s NBI Data To Predict the Deterioration of Bridges
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2022-04-01
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[PDF-4.38 MB]
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Edition:Final Report (April 2020-September 2021)
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Abstract:The objectives of this study were to develop deterioration curves for state-owned bridges in Missouri, study certain parameters that affect structure deterioration, and develop recommendations for cost effective designs. The study used inspection history data stored in the National Bridge Inventory (NBI). NBI data from 1983 through 2019 was used to determine the inspection histories and Condition Ratings (CR) for bridge components and culverts. Two different deterioration models were used to analyze these data. The Kaplan-Meir survival methodology was used to determine the Time in Condition Rating (TICR) and hazard functions for primary bridge components and culverts. Cox regression analysis was used to study parameters that affect structure deterioration. Parameters studied included the rate of salt application, span length, traffic volume, and environmental conditions. The performance of cast-in-place (CIP) bridge decks in different districts in the state was also studied. The results showed that the deterioration patterns for structures generally had an inflection point at CR 5, where deterioration rates increased as compared with CR 6,7, and 8. The results also demonstrated that the application of salt to the roadway to prevent icing had a significant impact on the deterioration of all structures, and its impact was commonly at least twice that of any other parameter studied. It was also found that increasing span length increased the rate of deterioration. Traffic volume as measured by Average Daily Traffic (ADT) and Average Daily Truck Traffic (ADTT) did not have a statistically significant effect on the deterioration of bridges. It was also found that the deterioration of bridge decks was different in different districts, and reliability curves were developed for each district to aid engineers in decision-making regarding maintenance and repair. Recommendations from the research included increasing the use of preservation strategies to maintain bridges in CR 6,7, and 8, where deterioration rates are lower as compared with CR 5, 4, and 3. Actions to prevent exposure to deicing chemicals, many of which are already applied in some cases, were described. Looking forward, research results should be considered as one factor in the selection of materials and geometry for new bridges.
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