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φ
V
c
≥
V
u
> 0.5
φ
V
c
V
u
> V
c
φ
V
u
≤ 0.5
φ
V
c
d/2
Provide calculated shear
reinforcement (
φ
V
s
= V
u
-
φ
V
c
)*
Provide minimum shear
reinforcement**
No shear
reinforcement
required
V
u max
φ
V
c
0.5
φ
V
c
*
V
s
≤ 8
b
w
d
** See ACI Section 11.4.6.1 for exceptions
Figure 3-7 Shear Reinforcement Requirements
Table 3-7 ACI Provisions for Shear Design
*
Members subjected to shear and flexure only;
V
c
=
2
f
c
b
w
d,
= 0.75 (ACI 11.2.1.1)
φ
φ
ʹ
φ
60 ksi (ACI 11.4.2)
*** Maximum spacing based on minimum shear reinforcement (= A
v
f
y
/50b
w
) must also be considered (ACI 11.4.6.3).
**
A
v
= 2
A
b
for U stirrups; f
y
≤
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