Civil Engineering Reference
In-Depth Information
The lower bound concrete shear strength is
V:
=
0.8f psib d .8 kip
′ ⋅
⋅
=⋅
c
c3_lower
f3
The ultimate shear force is
Max(V
u3
, V
u4
) = 3.021·kip
(
)
>
“ComputedetailedV”ifmax V,VV
c
u3 4
c3_lower
Check_ShearLongRenf3:=
“Minimum concrete shearstrength” otherwise
Check_ShearLongRenf3:=“Minimum concrete shearstrength”
FRP longitudinal reinforcement design:
The design reinforcement ratio
can be selected as the maximum between ρ
f
_
bend
and ρ
f
_
shear
:
ρ
f
_
des3
:= ρ
f
_
bend3
0.00375
This reinforcement ratio corresponds to an area of
A
f
_
des3
:= ρ
f_des3
·b·d
f3
= 0.315·in.
2
The required number of no. 4 bars is
A
A
f_des3
f_bar
N:
=
=
1.604
f_des3
The corresponding required spacing is
bN
N
−
φ
f_des3
f_bar
s
:
=
=
6.98 inf
⋅
f_des3
f_des3
The following bar spacing is selected:
s
f
_
bar3
:= 6 in.
The minimum required clear bar spacing is
s
f
_
min3
:= max(1·in., ϕ
f
_
bar
) = 1·in.
“OK”if s
−φ
≥
s
f_bar3
f_bar
f _min3
Check_ShearLongRenf3:
=
“Too many bars”otherwise
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