Civil Engineering Reference
In-Depth Information
The ratio of distance from neutral axis to extreme tension fiber to dis-
tance from neutral axis to center of tensile reinforcement is
β=
−⋅
⋅
hkd
d1k
f
f
:
=
1.17
11
(
)
−
f
f
The thickness of concrete cover measured from extreme tension fiber to
center of bar is
d
c
:= h - d
f
= 3.9 · in.
The bond factor (provided by the manufacturer) is
k
b
:= 0.9
The crack width under service loads is
2
2
f
E
s
2
+
=
fs
f1
2
⋅
w:
=
β
⋅
kb
⋅
d
0.02 in Equation (8-9)ofACI 440.1R-06
11
c
f
The crack width limit for the selected exposure is
w
lim
= 0.02 · in.
“OK” if ww
≤
lim
Check_Crack1:
=
“Not good”otherwise
Check_Crack1 = “OK”
10.9 STEP 7—RECHECK SHEAR STRENGTH
Beam (one-way) shear:
The ultimate shear force is
V
u
= 112.36 · kip
The reinforcement effective depth is
d
f
= 26.1 · in.
The new nominal shear strength is
=⋅
(
)
V: 5f psib kd 132 kip
n
=
′ ⋅
⋅
⋅
⋅
c
f
f
but not less than
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