Fatigue Damage of RC Beams Subjected to Low Level of Fatigue Loading

5th International Conference on Environmental Science and Civil Engineering

生态环境科学;土木建筑工程

Wang, Shuai^1 ; Wu, Jieqiong^1 ; Ye, Yinghua^1^2

School of Transportation Science and Engineering, Beihang University, Beijing, China^1

State Laboratory of Subtropical Building Science, South China University of Technology, Guangzhou, China^2

关键词: Concrete strain;    Fatigue loadings;    Mid-span deflection;    RC beams;    Reinforced concrete beams;    Residual deflection;    Residual deformation;    Ultimate strength;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/283/1/012026/pdf
DOI  :  10.1088/1755-1315/283/1/012026

来源: IOP

【 摘 要 】

The fatigue damage of reinforced concrete (RC) beam specimens subjected to low load level with the upper limit of 0.3Pu, 0.4Pu or 0.5Pu and the lower limit of 0.06Pu were experimentally studied, where Pu was the static ultimate strength of the RC beams. Based on the testing results of concrete strain and mid-span deflection, the effects of load level and fatigue cycle on the accumulation of fatigue damage were discussed. Results show that, the concrete strain, mid-span deflection and residual deflection would undergo a rapid increase followed by a stable change and they all increase as the upper limit or fatigue cycle increased, which indicated that the fatigue damage accumulated as the upper limit or fatigue cycle increased. The steady develop range of concrete strain and deflection became narrow as the upper limit of fatigue load increased to 0.5Pu. Besides, the residual deformation of RC beam specimens showed the boundary of fatigue cycles for steady development was 0.1 million for all load levels of 0.3, 0.4 and 0.5.