Corrosion non-uniformity of steel bars and reliability of corroded RC beams

Xianglin Gu, Hongyuan Guo, Binbin Zhou, Weiping Zhang, Chao Jiang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

99 Citations (Scopus)

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 languageEnglish
Pages (from-to)188-202
Number of pages15
JournalEngineering Structures
Volume167
DOIs
Publication statusPublished - 15 Jul 2018
Externally publishedYes

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

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