Strengthening of Columns for Confinement - Strengthening Design of Reinforced Concrete with FRP - page 215

FIGURE 7.P.2

Height 12 in. 305 mm

Width 12 in. 305 mm

Clear cover 1 in. 25 mm

r c 0.64 in. 16.26 mm

f c 6.41 ksi 44.22 MPa

n × t f 3 × 0.05 in. 3 × 1.27 mm

E f 2,864.33 ksi 19,761 M Pa

ε fu 0.0228 0.0228

f yt 66.625 ksi 459.65 MPa

Tie spacing 11.8 in. 300 mm

Tie diameter #3

(ϕ = 9.5 m m)

Longitudinal bars

8 (ϕ = 0.77 i in.) 8 ϕ 19.56 m m

f y 67.425 k si 465.2 MPa

Plot the approximate confined interaction diagram. The experimental point near
balanced failure is at P n = 569.7 kips and M n = 211.0 68 k-f t.

REFERENCES
Abd El Fattah, A. M. 2012. Behavior of concrete columns under various confinement effects.
PhD diss., Kansas State University, Manhattan, KS.
Abd El Fattah, A. M., H. A. Rasheed, and A. Esmaeily. 2011. A new eccentricity-based sim-
ulation to generate ultimate confined interaction diagrams for circular concrete col-
umns. Journal of the Franklin Institute-Engineering and Applied Mathematics 348 (7):
1163-76.
ACI 318-11. 2011. Building code requirements for structural concrete and commentary. ACI
Committee 318, Farmington Hills, MI.
ACI 440.2R-08. 2008. Guide for the design and construction of externally bonded FRP sys-
tems for strengthening concrete structures. ACI Committee 440, Farmington Hills, MI.