Also, three strain gauges were placed on compression reinforcement
according to the scheme shown in Figure 3.
It can be concluded that an RC section that behaves as quasi-isotropic one can be strengthened by compression reinforcement
up to achieving a double maximum moment bearing capacity of a section with single reinforcement.
The longitudinal reinforcement of the tested beams is two longitudinal bars of diameter 8 mm as tension reinforcement and two bars of 8 mm as compression reinforcement
(2[empty set]8 top and 4[empty set]8 bottom).
The beam designation includes a combination of letters and numbers: H to indicate the series; 16 and 22 to designate the diameter of tensile and compression reinforcement
; S to indicate the transverse reinforcement spacing; 125, 155, 250 and 310 mm to designate the spacing of transverse reinforcements.
Four 10 mm diameter longitudinal reinforcing bars were used for compression reinforcement
with a clear cover of 40 mm, and 6 mm diameter plain stirrups were spaced at 120 mm.
SD400 steel bars D10 (09.53 mm) are arranged with steel ratio of 0.0041, one layer of three D13 bars (012.7 mm) is arranged as compression reinforcements
, D10 shear bars are disposed every 100 mm in the shear zone to prevent shear failure, and CFRP tendons are used being 9.5 mm diameter in Figure 3.