Civil Engineering Reference
In-Depth Information
As an alternative, determine the required spacing of the No.3 U-stirrups at the critical section using Fig. 3-8.
Enter the chart with d = 24 in. and
V
s
= 38.9 kips. The point representing this combination is shown in the
design chart. The line immediately above this point corresponds to a spacing of s = 6 in. which is exactly what
was obtained using the previous simplified method.
φ
12'-0"
w
u
= 7 kips/ft
L
Column
L
Span
14"
5 @ 12"
2"
6 @ 6"
2 @ 8"
h = 27"
d = 24"
2.0'
1.17'
F
ace of
column
b
w
= 12"
d from support face
84 kips
75.8 kips
slope = 7 kips/ft
61
.8 kips
V
c +
φ
V
s
= 27.4 + 40 = 67.4 > 61.8 kips
φ
57.4 kips (27.4 + 30)
47.4 kips ( 27.4 + 20)
40 kips
30 kips
20 kips
27.4 kips =
φ
V
c
#3 @ d/2 d/3 d/4
φ
V
s
φ
V
c
/2
13.8 kips
No
stirrups
Required
Stirrups Required
1.17'
s = d/4
s = d/3
s = d/2
2.63
1.43
4.8
Figure 3-13 Simplified Method for Stirrup Spacing (Example 3.6.1)
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