Table 1: Experimental results.

Specimen wf
[mm]
sf
[mm]
wf/sf No of days to testing Vu,exp
[kN]
Vc + Vs
[kN]
Vfrp
[kN]
% gain due to CFRP Mode of failure
B1 N/A N/A N/A 87 73.57 73.57 0 0 S
B1-ST-SIDE 50 100 0.5 92 87.76 73.57 14.19 19.3 S / DB
B1-ST-U 50 100 0.5 92 98.36 73.57 24.79 33.7 S / DB
B1-CON-SIDE 1 1 1 93 96.86 73.57 23.29 31.7 S / DB
B1-CON-U 1 1 1 93 109 73.57 35.43 48.2 FC

Notation:
wf = width of CFRP strip laminate
sf = spacing of CFRP strip laminate
Vu,exp = experimental ultimate shear strength
Vc = shear strength due to concrete
Vs = shear strength due to steel stirrups
Vfrp = shear strength due to CFRP
S = diagonal tension shear failure
DB = debonding failure of the FRP strips/sheets
FC = flexural concrete compression failure