Abstract
To study the non-uniform distribution of cross-sectional areas and mechanical properties of corroded steel bars under a chloride environment, 19 concrete slabs embedded with steel bars were exposed to a chloride environment to achieve accelerated corrosion. A 3D measurement technique was employed to create geometric models of corroded steel bars, and their cross-sectional areas of a corroded steel bar, a probability distribution model of the spatial variability factor R, was developed through signal processing and statistical analysis methods. The R factor is the ratio of the average cross-sectional area to the minimum one and was applied to analyze the mechanical behavior response to the non-uniform corrosion of steel bars under tensile loading. In addition, the relationship between the mechanical properties and R factor of a corroded steel bar was established to predict its critical state of brittle failure. Our novel approach to this analysis enabled the calculation of the time-dependent reliability of a simply supported corroded reinforced concrete beam. The results showed that non-uniform corrosion is the critical factor affecting the time-dependent reliability of a reinforced concrete beam; moreover, changes in the failure mode of a corroded steel bar may severely impair the reliability of a reinforced concrete beam.
Original language | English |
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Pages (from-to) | 188-202 |
Number of pages | 15 |
Journal | Engineering Structures |
Volume | 167 |
DOIs | |
Publication status | Published - 15 Jul 2018 |
Externally published | Yes |
Keywords
- Corroded reinforced concrete beam
- Corrosion non-uniformity
- Mechanical property of a corroded rebar
- Time-dependent reliability
ASJC Scopus subject areas
- Civil and Structural Engineering