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Computers and Concrete Volume 19, Number 3, March 2017 , pages 305-313 DOI: https://doi.org/10.12989/cac.2017.19.3.305 |
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Probabilistic time-dependent sensitivity analysis of HPC bridge deck exposed to chlorides |
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Pratanu Ghosh, Petr Konečný, Petr Lehner and Paul J. Tikalsky
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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. | ||
| Key Words | ||
| corrosion initiation; probabilistic model; sensitivity analysis; SBRA; Monte-Carlo simulation; durability; performance assessment | ||
| Address | ||
| Pratanu Ghosh: Department of Civil and Environmental Engineering, California State University, Fullerton, CA-92834, Fullerton, California, USA Petr Konečný and Petr Lehner: Department of Structural Mechanics, VŠB-Technical University of Ostrava, 708 33 Ostrava - Poruba, Czech Republic Paul J. Tikalsky: Dean, College of Engineering, Architecture, and Technology, Oklahoma State University, 201 ATRC, Stillwater, OK 74078, USA | ||