United States Department of Transportation
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Developing Implementation Strategies for Risk Based Inspection (RBI): Back-Casting Report
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2024-10-01
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[PDF-9.89 MB]
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Edition:Interim Report (November 2018- February 2024)
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Abstract:The goal of this project was to improve asset management through the implementation of Risk-Based Inspection (RBI) practices. This project studied risk-based processes for developing extended inspection interval policies for bridges. Prior tasks in the research included Reliability Assessment Panels from six states developing risk models for bridges with steel and prestressed concrete superstructures. The risk models assess the relative risk of individual bridge components based on attributes that affect the reliability of the component. A back-casting process was applied to a sample population of bridges from the six states. This report describes the back-casting process and results developed through the research. A new data-driven methodology for analyzing the quality and effectiveness of the risk models based on Monte Carlo simulations was developed through the research. This methodology was shown to be effective for analyzing, calibrating, and verifying risk models for bridge components. The conclusions of the research indicate that a substantial number of bridges in good condition could be placed on an extended 72- month inspection interval, allowing inspection resources to be reallocated toward bridges with elevated risk.
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