Design of square footing for a single column - Reinforced Concrete with FRP Bars: Mechanics and Design - page 378

The maximum concrete strain is: ε c (c u ) = 0.00124.
The maximum FRP strain is: ε f (c u ) = 0.0086.

The nominal bending moment capacity can be computed as follows:

⋅ ε

(x)

c

2" ⋅σ

c

c

ε

u

∫

() ( )

c0

M: bx =⋅ ⋅ psidx+T cdc ⋅ − = 1826 ft kip ⋅ ⋅ n u u

f f

2

ε (x)

0

c

1+

ε

c0

The concrete crushing failure mode is less brittle than the one due
to FRP rupture. The ϕ-factor is calculated according to Jawahery and
Nanni [1]:

()

− ε

c

f u

0.65 if 1.15 ≤ 0.65

2 ε

fu

()

− ε

c

f u

φ= : 0.75 if 1.15 ≥ 0.75

b

2 ε

fu

()

− ε

c

f u

1.15 otherwise

2 ε

fu

ϕ b = 0.65

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

ϕ b ·M n = 1187·kip·ft

2

1
2 maxq ,q

bb
2

−

( )

col

M: = ,q ⋅ b ⋅ =390.139 kipft ⋅ ⋅

u u1 2 3

“OK” if φ⋅ MM ≥

b n u

Check_Flexure: =

“Not good”otherwise

Check_Flexure = “OK”