Design of a one-way slab - Reinforced Concrete with FRP Bars: Mechanics and Design - page 238

Equation (10-1) of ACI 440.1R-06 is

:= min0.0018· 60000psi
f

· 29000ksi
E

ρ ,0.0036 =0.0036

fts_des

fu f

The corresponding minimum area of GFRP reinforcement is

A fts _ des := ρ fts _ des ·b·t slab = 0.346·in. 2

The required number of no. 4 bars is

A
A

fts_des
f_bar

N:= =1.76

fs_des

The corresponding required spacing is

:= bN
N

− ⋅ φ

fs_des f_bar

s =6.318 in ⋅ .

fs_des

fs_des

The following bar spacing is selected:

s f _ ts := 6 in.

( )

“OK”if s ≤ in 3t ⋅ ,12in

f_ts slab

Check_s :=

f_ts

“Not good”otherwise

Check_s f_ts = “OK”

The area of GFRP temperature and shrinkage reinforcement is

b

2

A:= ⋅ A=0.39 in ⋅

f_ts f_bar

s

f_ts

The FRP reinforcement ratio (Equation (8-2) of ACI 440.1R-06) is

A
b·t

f_ts

ρ := =0.00409

f_ts

slab

No. 4 bars spaced 6 in. center to center are necessary if a single layer is
used. For convenience and symmetry, top and bottom layers are used here
with No. 4 bars spaced 12 in. center to center.