This paper investigates the bridging stress degradation of fiber reinforced cementitious composites under fatigue loading experimentally and theoretically. The fatigue tension experiments of Engineered Cementitious Composite (ECC) under constant displacement amplitude were conducted, and the degradation of bridging stress was…
This paper investigates the bridging stress degradation of fiber reinforced cementitious composites under fatigue loading experimentally and theoretically. The fatigue tension experiments of Engineered Cementitious Composite (ECC) under constant displacement amplitude were conducted, and the degradation of bridging stress was measured. Three displacement amplitudes were examined in order to change the stress level of individual fibers. As a result, the larger the displacement amplitude, the earlier 5 the bridging stress decreased. Also, the decrease of bridging stress was observed to cease around 10 cycles. Next, the analytical modeling of bridging stress degradation was carried out. The model accounts for the loss of fatigue ruptured fibers, where fatigue rupture is based on the S-N relation of a fiber type, depending on the stress level and the number of cycles. Overall, the developed model shows a good agreement with the experimental results, showing the validity of the model developed in the study.