Flexural Strengthening of Beams and Slabs - Strengthening Design of Reinforced Concrete with FRP - page 149

moment capacity if the GFRP was continuously anchored against cover delamina-
tion and sheet debonding. Assume no need to strengthen the beam in shear.

Problem 5.14
Spadea, Bencardino, and Swamy (1998) designed, built, strengthened, and tested a
rectangular reinforced concrete beam (A3.3) having the section geometry and beam
profile shown in Figures 5.P.10 and 5.P.11. Knowing that beam A3.3 had distrib-
uted steel U-wrap anchors along its span, it is expected that the two modes of cover
delamination and plate debonding were avoided. Considering the rest of the possible
failure modes, design the FRP plate width ( b f ) so that it will provide an ultimate load
of 98.3 kN. Compare the answer to the 80-mm width of the actual plate.

140 mm

2 φ 16 mm

φ 4 mm @
150 mm c/c

300 mm

2 φ 16 mm

25mm

b f × 1.2 mm

FIGURE 5.P.10

P/2

P/2

1200 mm 1800 mm

1800 mm

4700 mm

4800 mm

Beam A3.3

FIGURE 5.P.11

f = 30.5 MPa, f = 435 MPa, ε= 0

c y bi

t = 1.2 mm, E = 152 GPa, f = 2300 MPa

f f fu

REFERENCES
ACI 318-05. 2005. Building code requirements for structural concrete and commentary. ACI
Committee 318, Farmington Hills, MI.
ACI 318-11. 2011. Building code requirements for structural concrete and commentary. ACI
Committee 318, Farmington Hills, MI.