Investigation of Flexural Fatigue Behavior of Concrete Beams Reinforced with Intelligent CFRP-OFBG Plates

Table 3

Analysis results of bending stiffness of reinforced beams in fatigue tests.

Specimens	Initial stiffness B0	Destructive stiffness Bf	Destructive stiffness ratio Bf/B0	Cumulative damage value DN
JB-3	0.772	0.558	0.721	0.279
JB-4	0.755	0.559	0.737	0.263
JB-5^a	0.553	0.344	0.622	0.378
JB-6	0.763	0.554	0.726	0.274
Statistics	—	—	0.728	0.272

^aJB-5 did not conform to the three-stage development law and was not included in statistical value.