Computers and Concrete

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Probabilistic time-dependent sensitivity analysis of HPC bridge deck exposed to chlorides

  • Ghosh, Pratanu (Department of Civil and Environmental Engineering, California State University) ;
  • Konecny, Petr (Department of Structural Mechanics, VSB-Technical University of Ostrava) ;
  • Lehner, Petr (Department of Structural Mechanics, VSB-Technical University of Ostrava) ;
  • Tikalsky, Paul J. (College of Engineering, Architecture, and Technology, Oklahoma State University)
  • Received : 2015.11.26
  • Accepted : 2016.12.29
  • Published : 2017.03.25
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Abstract

A robust finite element based reinforced concrete bridge deck corrosion initiation model is applied for time-dependent probabilistic sensitivity analysis. The model is focused on uncertainties in the governing parameters that include variation of high performance concrete (HPC) diffusion coefficients, concrete cover depth, surface chloride concentration, holidays in reinforcements, coatings and critical chloride threshold level in several steel reinforcements. The corrosion initiation risk is expressed in the form of probability over intended life span of the bridge deck. Conducted study shows the time-dependent sensitivity analysis to evaluate the significance of governing parameters on chloride ingress rate, various steel reinforcement protection and the corrosion initiation likelihood. Results from this probabilistic analysis provide better insight into the effect of input parameters variation on the estimate of the corrosion initiation risk for the design of concrete structures in harsh chloride environments.

Keywords

Acknowledgement

Supported by : VSB-TUO

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