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

Table 1

Experimental loading conditions and results.

Specimen	Carrying capacity (kN)	Load limit (kN)	Stress ratio	Frequency (Hz)	Stress level	Fatigue life	Fatigue life	Failure mode	Note
B-1	43.0	—	—	—	—	1	1	Steel yield and the concrete was crushed	Static test
JB-2	53.0	—	—	—	—	1N	1	Steel yield by debonding and concrete was crushed
B-3	—	5.4～27	0.2	5	0.628	9.40	—	Steel fracture	Fatigue test
JB-3	—	5.4～27			0.509	109.48	114.52	Steel fracture followed by debonding
JB-6	—	6.0∼30			0.566	63.98	66.44	Steel fracture followed by debonding
JB-4	—	6.6～33			0.623	37.67	37.67	Steel fracture followed by debonding
JB-5	—	7.8～39			0.736	8.96	8.96	Steel fracture followed by debonding

^a, is lower load. ^b (10,000 cycles) is fatigue lives of corresponding components when steel bar was fatigue fractured. ^c (10,000 cycles): the carbon plate is completely peeled off and test pieces completely damaged to corresponding fatigue lives.