Shear Strengthening of RC Beams Using Sprayed Glass Fiber Reinforced Polymer

Table 5

Validity of proposed equation to calculate the contribution of sprayed GFRP in shear strength of RC beam.

Sprayed GFRP configuration	Beam name	Peak load (kN)	Peak load of control beam (kN)	Contribution of GFRP in shear strength (kN) ((2)-(3))	𝑑frp, FRP width (mm)	𝑡frp, FRP thickness (mm)	𝐸frp, tensile modulus of elasticity of FRP (MPa)	𝜀frp, effective strain of FRP	𝑉frp[kN]=2𝑡frp⋅𝑑frp⋅𝐸frp⋅𝜀frp(2×(6)×(5)×(7)×(8))	𝑉calc/𝑉exp (9)/(4)
	(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)
Sprayed FRP on two sides with epoxy	B2-NS-EP	96.8	79	17.8	100	2.2	14000	0.003	18.5	1.04
	B2-S-EP	144.9	91.6	53.3	120	6	14000	0.003	60.5	1.13
Sprayed FRP on two sides with mechanical fasteners	B2-4B-NS-1	92	77.2	14.8	100	1.8	14000	0.003	15.1	1.02
	B2-4B-NS-2	99.4	77.2	22.2	100	2.5	14000	0.003	21.0	0.95
	B2-4B-NS-3	111.5	77.2	34.3	100	4	14000	0.003	33.6	0.98
	B2-4B-S-1	122.4	87.7	34.7	120	3.5	14000	0.003	35.3	1.02
	B2-4B-S-2	129.8	87.7	42.1	120	4.2	14000	0.003	42.3	1.01
	B2-4B-S-3	132.8	87.7	45.1	120	4.5	14000	0.003	45.4	1.01
	B2-6B-NS-1	108.1	77.2	30.9	100	3.5	14000	0.003	29.4	0.95
	B2-6B-NS-2	117.2	77.2	40	100	4	14000	0.003	33.6	0.84
	B2-6B-NS-3	121.9	77.2	44.7	100	4.5	14000	0.003	37.8	0.85
	B2-6B-S-1	126.7	87.7	39	100	4	14000	0.003	33.6	0.86
Sprayed FRP on three sides	B3-S-1	128.5	91.6	36.9	120	3.2	14000	0.003	32.3	0.87
	B3-S-2	135.4	91.6	43.8	120	4	14000	0.003	40.3	0.92
	B3-S-3	157.1	91.6	65.5	120	7	14000	0.003	70.6	1.08
	B3-S-4	166	91.6	74.4	120	8	14000	0.003	80.6	1.08
Sprayed FRP on two sides (no epoxy, no mechanical fasteners)	B2-NS	105.5	79	26.5	100	4	14000	0.002	22.4	0.85
	B2-S-1	117.2	91.6	25.6	120	3.5	14000	0.002	23.5	0.92
	B2-S-2	128.9	91.6	37.3	120	4.5	14000	0.002	30.2	0.81
	B2-S-3	129.3	91.6	37.7	120	5.6	14000	0.002	37.6	1.00
	B2-S-4	132.1	91.6	40.5	120	6	14000	0.002	40.3	1.00
	B2-S-5	133.2	91.6	41.6	120	7	14000	0.002	47.0	1.13