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Mid-America Transportation Center

NDOR Comprehensive Evaluation of Fracture Critical Bridges


Researchers

  • Principal Investigator: Atorod Azizinamini (aazizinamini1@unl.edu 402-472-5106)
  • Project Status
    In Progress
    Sponsors & Partners
  • Nebraska Department of Roads
  • Brief Project Description & Background
    The State of Nebraska has about 1400 bridges that are designated as bridges with fracture critical members or components. Currently the inspection of these bridges is conducted using "arm length" approach, which is costly and is a drain on the State's total bridge budget. Eliminating some of these bridges from the fracture critical list and developing a strategy, prolonging the "arm length" inspection cycle, beyond two years, will result in major savings for the State. The research team will provide the State with a roadmap to reduce amount of work needed to maintain and safely operate the State's bridges with fracture critical members
    Abstract
    According to the AASHTO LRFD Bridge Design Specifications, "Frature Critical members or member components (FCMs) are steel tension members or steel tension components of members whose failure would be expected to result in collapse of the bridge." The State of Nebraska has about 1400 bridges that are designated as bridges with fracture critical members or components. The majority of these bridges have an extremely low Average Daily Truck Traffic (ADTT). In most cases, ADTT is very low, about 10 trucks per day. In addition, almost 500 of these bridges are two girder systems, with rest being steel truss bridges. Currently the inspection of these bridges is conducted using "arm length" approach, which is costly and is a drain on the State's total bridge budget. Eliminating some of these bridges from the fracture critical list and developing a strategy, prolonging the "arm length" inspection cycle, beyond two years, will result in a major saving for the State. The research team will be utilizing the latest findings and available technologies to provide the State with a roadmap to reduce amount of work needed to maintain and safely operate the State's bridges with fracture critical members.
    Project Amount
    $ 286,348
    Modal Orientation
  • Structures