Design of a column - Reinforced Concrete with FRP Bars: Mechanics and Design - page 337

1'-8"

Ty pical Column Section

8 #8

#4 cross-ties

8 #8

#4 @ 12 in.

5'-10"
(min)

Lap splice #4 ties

Note: 1-1/2-inch minimum
clear cover for ties

2'-4"

#4 @ 6 in. Ty pical no. 4 tie and cross-tie details

1´-2˝ 6˝

1´-2˝

#4 @ 12 in.

R=1.5˝ R=1.5˝

(b)

(a)

Figure 9.10 (a) Reinforcement layout; (b) typical detail.

9.3.2 Concrete properties
The following concrete properties are considered for the design:

f c := 5000 psi Compressive strength

ε cu := 0.003 Ultimate compressive strain

145 lbf
ft 3

ρ

:

= Density

1.5

⋅

ρ
⋅

0.5 c

E:33 psi f ′ Compressive modulus of elasticity

=

c c

− 3

lbf ft

E c = 4074 ksi Computed as indicated in ACI 318-11

f:7.5fpsi
ct

⋅

′ ⋅

Concrete tensile strength

= c

f ct = 530.33 psi Computed as indicated in ACI 318-11