Civil Engineering Reference
In-Depth Information
Table 17.9
Material parameters of soil
Velocity of P wave
V
S
(m/s)
Velocity of P wave
V
P
(m/s)
Poisson ratio
μ
Soil density
ρ
(kg/m
3
)
Thickness of soil
(m)
500
866
0.25
2200
30
forces of piers subjected to P waves of different input angles of the oblique
incidence wave are shown in Figure 17.26. The results showed that the
shear force of the middle pier is smaller than the other two piers. The shear
force and moment of the piers with seismic wave in the vertical direction
are smaller than the force and moment with inputting wave at a 30° angle.
Conversely, the axial force of the piers is larger in the vertical direction.
The amplitudes of the internal forces of piers with SV waves of differ-
ent input angles of the oblique incidence waves are shown in Figure 17.27.
The shear force of the middle pier is smaller than those of the other two
piers as well. But the results of the SV waves showed a reverse trend from
the P waves. The shear force and moment of the piers with seismic wave in
the vertical direction is larger than the force and moment with inputting
wave at a 30° angle. Conversely, the axial force of the piers is smaller in the
vertical direction.
1600
100
1500
80
1400
60
0
30°
1300
40
0
30°
1200
20
0
1100
2
3
4
2
3
4
(a)
Pier number
(b)
Pier number
600
400
0
30°
200
0
2
3
4
(c)
Figure 17.26
Maximum amplitude of internal forces at bottom of piers under oblique
incidence P waves: (a) shear force (
V
); (b) axial force (
N
); (c) Moment (
M
y
).
Pier number
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