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Adjacent prestressed box beam bridges account for approximately 25% of Indiana’s bridge population. In fact, over 4,000 of Indiana’s bridges are box beams. Unfortunately, adjacent box beams have a history of poor long-term performance including premature deterioration and failures. Leaking joints between box beams allow chloride-laden water to migrate through the superstructure and initiate corrosion. The nature of this deterioration leads to uncertainty of the extent and effect of deterioration on structural behavior. The objective of this research is to develop recommendations for the inspection, load-rating, and design of adjacent box beam bridges. This research focuses on the following: correlating visual damage to internal deterioration, understanding the capacity of deteriorated beams, understanding the live load distribution of adjacent boxes, developing procedures to estimate the remaining capacity of deteriorated beams, and providing recommendations for the design of the next generation of adjacent box beam bridges. A review of the Indiana Department of Transportation (INDOT) standards and bridge design manuals was conducted to track the historical development of box beams in Indiana. The INDOT database of box beam bridges was also analyzed for trends in deterioration. To supplement the database analysis, a series of bridge inspections were conducted to further identify the common types and potential causes of deterioration. These inspections identified a series of deteriorated box beams with common deterioration that were subsequently acquired for experimental testing. Experiments were conducted to determine the extent of deterioration and effect of deterioration on structural capacity. In addition, load tests were conducted on an in-service bridge to investigate live-load distribution. The research is presented in two volumes. Volume 1 presents the evolution and performance of box beam bridges in Indiana while Volume 2 presents the evaluation and structural behavior of deteriorated box beams.

Concrete Box Beam Risk Assessment and Mitigation: Volume 2—Evaluation and Structural Behavior