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Modal deck displacements
0.30
MPA
THA-ElCentro 3% MAX
THA-North CC1 3% MAX
THA-S. Monica 3% MAX
AVE THA
0.25
0.20
0.15
0.10
0.05
0.00
1
2
3
4
5
6
7
8
9
10
11
12
13
Figure 17.23
Comparison of different methods by deck displacement.
Modal deck displacements
0.25
SPA
MPA
AVE THA
0.20
0.15
0.10
0.05
0.00
1
2
3
4
5
6
7
8
9
10
11
12
13
Figure 17.24
Comparison of different methods by deck displacement (PGA
=
0.30
g
).
most rigorous procedure to compute seismic demands. To this effect, a set
of three real-time acceleration records compatible with the design spectrum
was used in the NL-THA analyses. The deck displacements determined
from each of the SPA and MPA analyses with respect to the control point of
the most critical pier were compared with those from NL-THA for increas-
ing levels of earthquake excitation, as shown in Figure 17.22, for multiple
earthquake with their average, and Figures 17.23 and 17.24 compared SPA,
MPA, and NL-THA, both for PGA = 0.30
g
.
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