Civil Engineering Reference
In-Depth Information
where
M
0
seismic moment, N
m
shear modulus of material along fault plane
3
10
10
N/m
2
A
f
area of fault plane undergoing slip
15 (600)
9000 km
2
9
10
9
m
2
D
average displacement of ruptured segment of fault
2.5 m
Therefore,
M
0
A
f
D
(3
10
10
N/m
2
) (9
10
9
m
2
) (2.5 m)
6.75
10
20
N
m
Using Eq. (2.4) gives
M
w
6.0
0.67 log
M
0
6.0
0.67 log (6.75
10
20
)
8.0
2.6
Half Moon Bay is located on the California coast, about 40 km due south of San
Francisco. Based on Fig. 2.20, it should expect a modified Mercalli level of damage of IX,
which corresponds to heavy damage. Per Table 2.3, at a level of IX, well-designed frame
structures are thrown out of plumb.
CHAPTER 5
5.1
N
value
8
9
17. Assume
E
m
0.6,
C
b
1.0, and
C
r
1.0. From Eq. (5.1),
N
60
17. Per Table 5.2, the sand has a medium density.
5.2
v
0
v
u
t
(1.5)
b
(1.5)
18.9 (1.5)
9.84 (1.5)
43 kPa
N
60
1.67
E
m
C
b
C
r
N
Eq. (5.1)
where
E
m
0.45 (doughnut hammer)
C
b
1.0 (100-mm-diameter hole)
C
r
0.75
(3-m length of drill rods)
N
4
5
9 (
N
value)
Substituting these values into the equation gives
N
60
1.67 (0.45) (1.0) (0.75) (9)
5.1
5.3
From Prob. 5.2, the
N
value corrected for field testing procedures is
N
60
5.1.
Using Eq. (5.2) with
v
0
43 kPa and
N
60
5.1, then (
N
1
)
60
7.8. Per Table 5.3, for (
N
1
)
60
7.8, the sand has a medium density
5.4
Use
q
c
40 kg/cm
2
and
v
0
43 kPa (Prob. 5.2). Therefore,
1.8
q
c
1.8 (40)
____________
___________
59 kg/cm
2
q
c
1
100
0.8
43
100
v
0
0.8
5.5
In Fig. 5.12, using
N
60
5 and
v
0
43 kPa, we get
30°.
5.6
In Fig. 5.14, using
q
c
40 kg/cm
2
and
v
0
43 kPa, we get
40°.
CHAPTER 6
6.1
Soil type no. 4:
Assuming this soil is in a loose state and below the groundwater
table, this soil would be the most susceptible to liquefaction. As indicated in Sec. 6.3, the
