Title: Experimental and Analytical Investigation of the Fatigue Flexural Behavior of Corroded Reinforced Concrete Beams
Author(s): Li Song, Zhiwei Fan and Jian Hou
Appears on pages(s):
Keywords: fatigue flexural behavior, reinforced concrete beam, experiment, fatigue prediction mode, corrosion, pit geometry, stress concentration
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-tolength
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.