Design of a T-beam - Reinforced Concrete with FRP Bars: Mechanics and Design - page 295

Shear diagram

V u3 = 62 kip

0 6 12 18 24 30

-V u3 = -72 kip

Beam AB-3, ft

Select the GFRP reinforcement
Stirrup_Size :=

#2
#3

#4

#5
#6
#7
#8
#9
#10

The ACI 440.6 minimum manufacturer's guaranteed mechanical prop-
erties of the selected bars are

f fuuv = 100·ksi Ultimate guaranteed tensile strength of the FRP

ε fuuv = 0.018 Ultimate guaranteed rupture strain of the FRP

E f = 5700·ksi Guaranteed tensile modulus of elasticity of the FRP

The geometrical properties of the selected bars are

ϕ f _ f_stirrup = 0.5·in. Bar diameter

A f _ f_stirrup = 0.196·in. 2 Bar area

r bsv := 3ϕ f _ f_stirrup = 1.5·in. Radius of the bend

The tail of the stirrup is to be at least 12 bar diameters:

1 vtail := 12·ϕ f _ f_stirrup = 6·in.
The design tensile strength of the bend of FRP bar is

r

bsv

f: 0.05 ⋅ φ +0.3f=28.8ksi ⋅ Equation (7-3)ofACI 440.1R-06

= fbsv fu

f_stirrup