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Mid-America Transportation Center

Risk Mitigation for Highway and Railway Bridges

Final Report

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project report

Presentation Link

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presentation report

Webinar Video

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Webinar Video


Researchers

  • Principal Investigator: Andrzej Nowak (anowak2@unlnotes.unl.edu 402-472-1376)
  • Graduate Students
  • Marek Kozikowski
  • Tomasz Lutomirski
  • Marek Kozikowski
  • Undergraduate Students
  • Michael Dahm
  • Derek Christison
  • Derek Christison
  • Michael Dahm
  • Project Status
    Complete
    Sponsors & Partners
  • Mid-America Transportation Center
  • About this Project
    Brief Project Description & Background
    Bridges are vulnerable to extreme events such as natural disasters in addition to hazards stemming from negligence and improper maintenance, overloading, collisions, intentional acts of vandalism, and terrorist attacks. These structures must be protected but the current approach to risk is not always rational. Sensitivity analysis will be performed to relate the reliability of bridges and reliability of the transportation network.
    Research Objective
    The objective is to develop efficient risk analysis procedures for assessment of the actual safety reserve at the network level and for individual bridges. The focus is on the system approach using the system reliability methods.
    Potential Benefits
    Risk analysis procedures will be developed for transportation network including highway and railway bridges, selection criteria for the target risk level, and implementation procedures for risk control. The major contribution of the project is the development of rational selection criteria for the target risk for bridges, depending on the consequences of failure and relative costs
    Abstract
    Performance of the transportation network strongly depends on the performance of bridges. They constitute a vital part of the transportation infrastructure system, and they are vulnerable to extreme events such as natural disasters (i.e., hurricanes, earthquakes, floods, major storms), in addition to hazards stemming from negligence and improper maintenance, collisions (vessels and vehicles), intentional acts of vandalism, and terrorist attacks. These structures must be protected, but the current approach to risk is not rational. Therefore, the objective of this project is to develop efficient risk analysis procedures for assessment of the actual safety reserve in highway and railway bridges. The focus is on the approach at the system level, using system reliability methods. Sensitivity analysis will be performed to relate the reliability of bridges and reliability of the transportation network. The results will then be used to identify the critical parameters. The target risk will be determined depending on consequences of failure and relative costs. Rational selection criteria will be developed for the target risk level for bridges (components and systems) as a part of the transportation network, based on the consequences of failure and relative costs. This will involve the development of efficient system reliability procedures that will be applied to perform sensitivity analysis relating various parameters and reliability. The resulting sensitivity functions will provide a rational basis for identification of the most important parameters that affect the network performance. Rational selection criteria for the target risk will find important applications in decision making processes regarding operation, maintenance, repair, rehabilitation and replacement.
    Project Amount
    $ 60,049
    Modal Orientation
  • Railroad
  • Structures