Civil Engineering Reference
In-Depth Information
Footing Capacity Based on Punching Shear
(0.75)Vn = (0.75)Vc = 419500.71 lbs (ACI Equation 11.35
controls)
Footing Capacity Based on Beam Shear along h dimension
(0.75)Vn = (0.75)Vc = 164152.45 lbs
Footing Capacity Based on Beam Shear along b dimension
(0.75)Vn = (0.75)Vc = 164152.45 lbs
Required Steel Area in the b Direction
As = 6.660 sq.in.
Phi = 0.900
Required Steel Area in the h Direction
As = 6.660 sq.in.
Phi = 0.900
PROBLEMS
For Problems
12.1
to
12.30
, assume that reinforced concrete weighs 150 lb/ft
3
, plain concrete 145 lb/ft
3
, and soil
100 lb/ft
3
.
Wall Footings
For Problems
12.1
to
12.5
, design wall footings for the values given. The walls are to consist of reinforced concrete.
Distance from
Wall
bottom of footing
c
thickness
D
L
f
f
y
q
a
to final grade
Problem
(in.)
(k/ft)
(k/ft)
(ksi)
(ksi)
(ksf)
(ft)
12.1
12
17
25
4
60
4
4
12.2
12
20
30
4
60
4
4
12.3
14
18
20
5
60
5
6
12.4
15
24
28
4
60
4
4
12.5
15
24
32
4
60
4
5
(
Answer to Problem 12.1:
22 in. footing 12 ft 0 in. wide with #8 @ 9 in. main steel)
(
Answer to Problem 12.3:
17 in. footing 9 ft 0 in. wide with #7 @ 9 in. main steel)
(
Answer to Problem 12.5:
28 in. footing 17 ft 0 in. wide with #9 @ 8 in. main steel)
12.6
Repeat Problem 12.1 if a masonry wall is used.
