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Earthquakes and Structures
  Volume 15, Number 3, September 2018, pages 253-261

Development of a bridge-specific fragility methodology to improve the seismic resilience of bridges
Jazalyn Dukes, Sujith Mangalathu, Jamie E. Padgett and Reginald DesRoches

    This article details a bridge-specific fragility method developed to enhance the seismic design and resilience of bridges. Current seismic design processes provide guidance for the design of a bridge that will not collapse during a design hazard event. However, they do not provide performance information of the bridge at different hazard levels or due to design changes. Therefore, there is a need for a supplement to this design process that will provide statistical information on the performance of a bridge, beyond traditional emphases on collapse prevention. This article proposes a bridge-specific parameterized fragility method to enable efficient estimation of various levels of damage probability for alternative bridge design parameters. A multi-parameter demand model is developed to incorporate bridge design details directly in the fragility estimation. Monte Carlo simulation and Logistic regression are used to determine the fragility of the bridge or bridge component. The resulting parameterized fragility model offers a basis for a bridge-specific design tool to explore the influence of design parameter variation on the expected performance of a bridge. When used as part of the design process, these tools can help to transform a prescriptive approach into a more performance-based approach, efficiently providing probabilistic performance information about a new bridge design. An example of the method and resulting fragility estimation is presented.
Key Words
    bridge-specific fragility; response surface; seismic design process; bridge resilience; probabilistic method
Jazalyn Dukes: Formerly of School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, GA, USA
Sujith Mangalathu: School of Civil and Environmental Engineering, University of California, Los Angeles, CA, USA
Jamie E. Padgett and Reginald DesRoches: Department of Civil and Environmental Engineering, Rice University, Houston, TX, USA

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