Civil Engineering Reference
In-Depth Information
which
T
is the estimated
temperature change, and 0.000005 per unit length per degree Fahrenheit is the estimated
coefficient of contraction of the wall.
L
is the change in length,
L
is the distance between joints,
L
(0.000005
L
)(
T
)
PROBLEMS
In Problems
13.1
to
13.4
, use the Rankine equation to cal-
culate the total horizontal active force and the overturning
moment for the wall shown in the accompanying illustra-
tion. Assume that
In Problems
13.7
to
13.9
, determine the safety factors
against overturning and sliding for the gravity and semi-
gravity walls shown if
30
and the coefficient of fric-
tion (concrete on soil) is 0.5. Compute also the soil
pressure under the toe and heel of each footing. The soil
weighs 100 lb/ft
3
, and the plain concrete used in the foot-
ing weighs 145 lb/ft
3
. Determine horizontal pressures
using the Rankine equation.
and the soil weighs 100 lb/ft
3
.
Neglect the fill on the toe for each wall.
30
Problem 13.7
(
Ans.
5.69, 2.67,
2193 psf,
1015 psf)
3' 0"
5' 0"
5' 0"
12' 0"
soil
7' 0"
8' 0"
Problem
A
B
CDE
h
13.1
6
0
3
0
1
6
5
6
1
6
16
0
Problem 13.8
13.2
10
6
2
6
1
9
6
3
1
8
20
0
3' 0"
4' 0"
13.3
13
0
4
6
1
6
6
0
1
6
24
0
13.4
14
6
4
0
1
6
9
0
2
0
28
0
8' 0"
soil
16' 0"
(
Answer to Problem 13.1:
4266 lb; 22,754 ft-lb)
(
Answer to Problem 13.3:
9600 lb; 76,800 ft-lb)
13.5
Repeat Problem 13.1 if
8' 0"
is 20
. (
Ans.
6276 lb;
33,472 ft-lb)
13.6
Repeat Problem 13.3 if
is 23
40
.
7' 0"
