Civil Engineering Reference
In-Depth Information
OTHER GEOTECHNICAL
EARTHQUAKE ENGINEERING
ANALYSES
The following notation is used in this chapter. See Chap. 8 for bearing capacity notation.
SYMBOL
DEFINITION
a
Acceleration
a
max
Peak ground acceleration
A, B, C
Seismic source types
B
Width of pipeline (for trench conditions
B
width of trench at top of pipeline)
c
A
Adhesion between cohesive soil and pile or pier perimeter
C
a
, C
v
Seismic coefficients needed for development of a response spectrum
C
w
Coefficient used to calculate load on a pipeline for trench or jacked condition
D
Diameter of pipeline
E
Modulus of soil resistance
F
v
Vertical pseudostatic force (pipeline design)
g
Acceleration of gravity
H
Height of soil above top of pipeline
k
,
k
0
Dimensionless parameter equal to
h
divided by
v
k
h
Horizontal seismic coefficient
k
v
Vertical seismic coefficient
K
b
Bedding coefficient
L
,
L
1
Length of pile or pier subjected to the downdrag load
m
Total mass of soil bearing on pipeline
N
a
, N
v
Near-source factors
(
N
1
)
60
N
value corrected for field testing procedures and overburden pressure
Q
D
Downdrag load acting on the pile or pier
Q
p
,
Q
s
Ultimate end-bearing and skin friction capacity of pile or pier
r
,
R
Radius of the pile or pier
s
u
Undrained shear strength
S
A
, S
B
, etc.
Soil profile types
T
Period of vibration
T
0
,
T
s
Periods needed for determination of response spectrum
T
ult
Ultimate capacity for the pile or pier in tension
V
s
1
Corrected shear wave velocity [Equation (6.9)]
W
Total weight of soil bearing on top of pipeline
W
min
Minimum vertical load on rigid pipeline
z
Embedment depth of the pile or pier
t
Total unit weight of soil
w
Friction angle between soil and pile or pier
11.1 INTRODUCTION
The prior chapters in Part 2 have described field investigation, liquefaction analyses, earth-
quake-induced settlement, bearing capacity, slope stability, and retaining wall analyses.
There are many other types of earthquake analyses that may be required by the geotechnical
11.1
