Structural Engineering and Mechanics

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New reliability framework for assessment of existing concrete bridge structures

  • Mahdi Ben Ftima (Department of Civil, Geological, and Mining Engineering, Polytechnique Montreal) ;
  • Bruno Massicotte (Department of Civil, Geological, and Mining Engineering, Polytechnique Montreal) ;
  • David Conciatori (Department of Civil and Water Engineering, Faculty of Sciences and Engineering, Laval University)
  • Received : 2023.08.05
  • Accepted : 2024.02.14
  • Published : 2024.02.25
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Abstract

Assessment of existing concrete bridges is a challenge for owners. It has greater economic impact when compared to designing new bridges. When using conventional linear analyses, judgment of the engineer is required to understand the behavior of redundant structures after the first element in the structural system reaches its ultimate capacity. The alternative is to use a predictive tool such as advanced nonlinear finite element analyses (ANFEA) to assess the overall structural behavior. This paper proposes a new reliability framework for the assessment of existing bridge structures using ANFEA. A general framework defined in previous works, accounting for material uncertainties and concrete model performance, is adapted to the context of the assessment of existing bridges. A "shifted" reliability problem is defined under the assumption of quasi-deterministic dead load effects. The overall exercise is viewed as a progressive pushover analysis up to structural failure, where the actual safety index is compared at each event to a target reliability index.

Keywords

Acknowledgement

The authors would like to acknowledge the financial support obtained from Natural Sciences and Engineering Research Council (NSERC) of Canada, the Center for Research on Concrete Infrastructures of Quebec (FRQNT-CRIB), and the Quebec Ministry of Transportation.

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