Fatigue Flexural Performance of Short-Span Reinforced Concrete T-Beams Considering Overloading Effect

2020
Chenxu Zhuang, Jinquan Zhang, Ruinian Jiang

Traffic volume increase and higher proportion of heavier trucks have raised the potential risk of fatigue failure of short-span reinforced concrete beams. To investigate the fatigue behavior of short-span reinforced concrete beams with and without the overload effect, nine 5 m reinforced concrete T-beams were cast and tested. Two beams were tested under static loading to determine the ultimate strength; the remaining seven beams were subjected to cyclic loading with constant-amplitude load ranges. In addition, two of the seven beams were subjected to instant overloading. It was observed that the typical failure mode under cyclic loading was the fatigue fracture of tensile reinforcing bars. The introduction of instant overloading resulted in a remarkable reduction of fatigue life. Among all the parameters, the stress range of the reinforcing bars showed the highest effect on the fatigue life. In the end, the fatigue safety provisions in the current reinforced concrete beam design codes were evaluated based on the fatigue limits and S-N curves.

Keywords
Fatigue life | Fatigue limit | Overloading | Reinforced concrete beams | S-N curve | Short-span | Stress range
DOI
10.7250/bjrbe.2020-15.474
Hyperlink
https://bjrbe-journals.rtu.lv/article/view/bjrbe.2020-15.474

Zhuang, C., Zhang, J., Jiang, R. Fatigue Flexural Performance of Short-Span Reinforced Concrete T-Beams Considering Overloading Effect. The Baltic Journal of Road and Bridge Engineering, 2020, Vol. 15, No. 2, pp. 89-110. ISSN 1822-427X. e-ISSN 1822-4288. Available from: doi:10.7250/bjrbe.2020-15.474

Publication language
English (en)