Design of a T-beam - Reinforced Concrete with FRP Bars: Mechanics and Design - page 265

A
bd

f1new
w

ρ : = 0.017261

= f1new

⋅

f1

The stress-block depth is recomputed based on the presence of straight
bars and an equal number of bends:

Af
0.85 fb

⋅
⋅ ′ ⋅

f1newf_bent
c

if ρ ρ Equation(8-4b) of ACI 440.1R-06

f1newfb1

w

a

:

=

f1new

ε
ε+ε

cu

β⋅ d therwise Equation(8-4c)ofACI 440.1R-06

1 f1

cu fu

a f1new = 2.534·in.

Neutral axis depth is

a

f1new
1

c : = 3.379 in. ⋅

= f1new

β

The nominal moment capacity is

a

=⋅

f1new

M: Af ⋅ ⋅ d − 373 ft kip ⋅

=

nnew f1newf_bent f1

2

The ϕ-factor is 0.55 when bond controls:

ϕ bond := 0.55

The design flexural strength equation is computed per Equation (8-1) of
ACI 440.1R-06:

ϕ bond ·M nnew = 205 kip·fit

“O K” if φ⋅ MM(M ≥ = 145 kipft) ⋅ ⋅

bond nnew u1 u1

Check_Flexure_bond_1 :

=

“Not good”otherwise

Check_Flexure_bond_1 = “OK”