Flexural members - Reinforced Concrete with FRP Bars: Mechanics and Design - page 94

(a) Immediately prior to failure with marked-up cracks

(b) Detail of failed concrete in compression and GFRP bar in tension

Figure 4.8 Testing of GFRP-RC beam at Missouri University of Science and Technology,
Rolla, Missouri. (Courtesy of Prof. Fabio Matta.)

Example 4.4

Calculate the nominal flexural strength of the beam in Example 4.1, if
A f = 2#10 = 2.54 in. 2 .
Solution: ω f = 0.1082

ω fb = 0.1667 > ω f : Failure by FRP rupture
E c (ksi) = 57√ f ′ c (psi) = 3605 ksi
ε′ c = 0.00189
c b = 5.08 in.

Iteration 1: c = 4.0 in. : First guess

ε c = 0.00222
α 1 β 1 = 0.715
c = 3.3 in.

Continued