Abstract
The fatigue flexural behavior of corroded reinforced concrete (RC) beams was experimentally and analytically examined. Seven beams were constructed and tested, and an analytical fatigue prediction model (FPM) was proposed to assess the fatigue behavior of the corroded beams. After validating the FPM with the experimental test results, the FPM was then extended to better understand the effects of the degree of steel corrosion, the corrosion pit geometry, and the fatigue load level on the performance of corroded RC beams. The results show that the fatigue behavior of the corroded steel bars determines the fatigue behavior of the beams. Rebar corrosion has a significant detrimental effect on the fatigue performance of RC beams due to stress concentration, loss of steel cross-sectional area, and diminished bonding at the steel–concrete interface. The stress concentrations increase with increasing pit width-to-length and depth-to-diameter ratios. Differences in pit geometry and the resulting changes in stress concentrations due to corrosion should be considered when assessing fatigue performance.
Highlights
The corrosion of reinforcing bars is a major factor that affects the deterioration of reinforced concrete (RC) structures; corrosion is typically associated with chloride ingress and carbonation (Ma et al 2014; Coronelli and Gambarova 2004)
The objective of this study is to investigate the flexural fatigue behavior of corroded RC beams and to develop a new fatigue prediction model (FPM) for corroded RC beams based on the fatigue properties of the constituent materials and the cross-sectional stress redistribution
4 Fatigue Prediction Model As mentioned in the introduction, the other objective of this study is to develop a new FPM of corroded RC beams based on the fatigue properties of the constituent materials and cross-sectional stress analysis
Summary
The corrosion of reinforcing bars is a major factor that affects the deterioration of reinforced concrete (RC) structures; corrosion is typically associated with chloride ingress and carbonation (Ma et al 2014; Coronelli and Gambarova 2004). Structural corrosion causes a loss of steel area, reduced reinforcement strength, cracking and spalling of the concrete cover, and diminished bonding at the steel–concrete interface (Almusallam 2001; Masoud et al 2001; Ai-Hammoud et al 2010). Structures such as highway and railway bridges are subjected to cyclic loading over their service lives, and this repeated stress can result in fatigue damage to the material. Repairing the beams with FRP decreased the tensile stress in the steel reinforcement and increased the fatigue life of the beams
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