An Experimental Investigation on Flexural Behavior of Reinforced Concrete Beams Strengthened by an Intelligent CFRP Plate with Built-In Optical Fiber Bragg Grating Sensors

Table 7

Summary of test results.

Specimen	Cracking load (kN)	Effect (%)	Yielding load (kN)	Effect (%)	Yielding deflection (mm)	Effect (%)	Ultimate load (kN)	Effect (%)	Ultimate deflection (mm)	Effect (%)	Ductility index	Failure mode
B0	54.5	—	262.3		12.66	—	331.4	—	85.84	—	6.78	CY
B-GR-0-T	67.4	23.67	337.5	28.67	11.19	9.56	438.5	32.3	51.66	66.16	4.62	IC
B-CR	47.2	—	258.3	—	12.02	—	311.6	—	84.84	—	6.99	CY
B-CR-0-T	68.5	45.12	376.8	45.88	16.88	40.43	438.7	40.6	50.48	68.07	2.99	DR
B-MS	50.2	—	154.3	—	11.81	—	198.6	—	79.38	—	6.72	CY
B-MS-0-T	81.0	61.35	228.5	48.09	8.30	47.07	331.9	67.12	52.81	50.31	6.36	DR
UB-GR-0-T	80.2	47.16	325.5	19.9	11.71	8.11	437.7	32.08	39.77	115.8	3.39	CFRP rupture
UB-GR-300-T	74.8	37.25	314.5	24.1	12.26	3.26	395.5	19.34	40.36	112.7	3.29	CFRP rupture
UB-NG-0-T	77.4	42.02	312.3	19.06	11.76	7.65	392.8	18.53	40.47	112.1	3.44	CFRP rupture
UB-NG-300-T	73.7	35.22	330	25.81	12.09	4.71	377.6	13.94	40.92	109.7	3.38	CFRP rupture