Experimental Study on Fatigue Behaviour of BFRP-Concrete Bond Interfaces under Bending Load

Table 1

Research progress in the fatigue behaviour of FRP/epoxy-concrete interface.

Parameters	Nigro et al. [13]	Carloni et al. [9]	Carloni and Subramaniam [14]	Diab et al. [19]	Iwashita et al. [17]	Ferrier et al. [11]	Ko and Sato [16]	Bizindavyi et al. [10]	Mazzotti and Savoia [12]	Yun et al. [18]	Dai et al. [15]
Number of specimens
Fatigue up to failure	-	3	-	6	13	23	-	46		2	7
Postfatigue monotonic loading	10	1	3	2	1	-	36	-	2	5	-
Joint style
Double shear				О	О	О	О			О
Single shear	О	О	О			О		О	О		О
Main variables	Bond length; load level	Load level	No	Load level	Load level	Resin type; load level	FRP type; FRP thickness	Load level; FRP type; FRP thickness; bond width; bond length	FRP type	Bond system	Load level; frost damage
FRP bonding length (mm)	Variable	152	152	250	200	NL	300	Variable	500	100	150
FRP width/concrete block width (mm)	100 or 50/150	25/125	25/125	50/100	50/100	50/140	50/100	Variable	80/200	50/200
Concrete compressive strength (cylinder) (MPa)	22.5	35	42	32	36.8	42.5	31.4	42.5	55.6	43.2	34.8–36.1
FRP type/elasticity modulus (GPa)
Carbon	216 or 171	230	230	240		235	261	75.7	180 or 272.8	257	230
Glass								29.2		64
Polyacetal							35
Aramid							72.5
PBO					235
FRP bond system
EB-FRP	О	О	О	О	О	О	О	О	О	О	О
NSM-FRP										О
HB-FRP										О
Fatigue load range
Lower limit load/static bond capacity	NL	15%	15%	10%	10%	NL	Variable	Variable	Variable	10%–29%	NL
Upper limit load/static bond capacity	15%–90%	60%–79%	70%	30%–80%	20%–70%	49%–80%	Variable	Variable	Variable	45%–76%	52%–73%
Frequency (Hz)	NL	1	1	5	5	1	NL	1	NL	5	NL
Failure mode
Fatigue up to failure	-	Debonding	-	NL	Debonding	Debonding	-	Fracture or debonding	-	-	-
Postfatigue monotonic loading up to failure	Debonding	Debonding	Debonding	NL	Debonding	-	Debonding	-	Debonding	Debonding	Debonding

Notes. NL = not mentioned.