Civil Engineering Reference
In-Depth Information
Checking Depth for One-Way Shear (Figure 12.15)
b
7 ft.
V
u
1
(7.0)(4.625)(4.71)
152.49 k
152,
490
(0.75)(2
4000)(84)
d
19.14
4.5
23.64
Use 24
Checking Depth for Two-Way Shear (Figure 12.16)
b
o
(4)(37.5)
150
V
u
2
[98.0
(3.125)
2
](4.71)
415.58 k
415,580
(0.75)(4
4000)(150)
14.60
d
415,580
d
40
d
150
0.75
2
(
4000)(150)
Solving quadratic
d
11.52
Design of Longitudinal Steel
Lever arm
14
2
9
12
6.25 ft
6.25
2
M
u
(6.25)(7.0)(4.71)
643.9 ft- k
M
u
(12)(643,900)
(0.90)(84)(19.5)
2
268.8
bd
2
p
0.00467 (from Appendix Table A.13)
A
s
(0.00467)(84)(19.5)
7.65 in.
2
Use 10 #8 bars (7.85 in.
2
)
Figure 12.15
Figure 12.16
