Research for AASHTO Standing Committee on Highways. Task 378. Assessing Risk for Bridge Management

The Moving Ahead for Progress in the 21st Century Act (MAP–21) requires that each state develop a “risk-based asset management plan” and declares that “it is in the vital interest of the United States … to use a data-driven, risk-based approach and cost-effective strategy for systematic preventative maintenance, replacement, and rehabilitation of highway bridges and tunnels to ensure safety and extended service life.” The legislation does not specify a method or performance measures for considering risk. However, the language makes clear the desirability of incorporating risk in a way that can reasonably be supported in a data-driven cost-effective process. Risks of interest include exogenous uncommon hazard that acts on a bridge or a small subset of bridges at random timing and location, and causes a loss of access, seriously degraded functionality for road users, unexpectedly rapid deterioration, or unexpectedly high cost. For these types of risks, it may be possible to estimate hazard likelihood at the level of geographic zones or structure categories, and vulnerability or resilience at the level of individual assets. This probabilistic approximation may enable an agency with suitable tools to quantify and manage risks in a data-driven cost-effective manner even if the exact risk for each bridge can never be measured or the timing of event is not exactly known. The hazards satisfying these criteria may include, but are not limited to, earthquakes and other types of earth movement, hurricanes and tornadoes, floods and scour, fires, vehicular or vessel collisions, fatigue, and advanced deterioration. These hazards have consequences that are beyond the normal deterioration and functional deficiencies already assessed in bridge management systems. The probability of each hazard and the ability of each structure to resist the hazard are not always consistently and quantitatively assessed at the current state of the practice. The objective of this research was to develop proposed AASHTO guidelines for a data-driven risk assessment at the bridge and structure level. The guidelines consider risks from natural and man-made hazards and are suitable for use in a bridge management system.


  • English


  • Status: Completed
  • Funding: $100000
  • Contract Numbers:

    Project 20-07, Task 378

  • Sponsor Organizations:

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590

    American Association of State Highway & Transportation Officials (AASHTO)

    444 North Capitol Street, NW, Suite 225
    Washington, DC  United States  20001

    National Cooperative Highway Research Program

    Transportation Research Board
    500 Fifth Street, NW
    Washington, DC  United States  20001
  • Project Managers:

    Dekelbab, Waseem

  • Performing Organizations:

    Western Management & Consulting LLC

    Jacksonville, FL  United States 
  • Principal Investigators:

    Western, Jeffrey

  • Start Date: 20150825
  • Expected Completion Date: 20160930
  • Actual Completion Date: 20160930
  • Source Data: RiP Project 39965

Subject/Index Terms

Filing Info

  • Accession Number: 01569096
  • Record Type: Research project
  • Source Agency: Transportation Research Board
  • Contract Numbers: Project 20-07, Task 378
  • Files: TRB, RIP
  • Created Date: Jul 1 2015 2:46AM