Incremental dynamic analysis (IDA) applied to seismic risk assessment of bridges - Seismic Risk Analysis and Management of Civil Infrastructure Systems - page 566

5

UHS
CMS-Inslab

CMS-Crustal

CMS-Interface
CMS-All

0.5

Vancouver
Vs30 = 555 (m/s)
2% probability of exceedance in 50 years
GMPEs: Z06 and BA08

0.05

0.2 Period, T 1 (s) 2

21.3 CMS using BA08 and Z06 GMPEs for T = 0.7 s (Tehrani et al .,

2012).

Table 21.1 Seismic deaggregation results for Vancouver at T = 0.7 s (epsilon values

using the BA08 and Z06 GMPEs)

Percentage of
contribution:
[Crustal,
Interface, Inslab]

Crustal events Interface events Inslab events

Probability
of
exceedance [ M - , - , ε [ M - , - , ε [ M - , - , ε

- ] - ] - ]

10% in
50 yr

[48%, 17%, 35%] [6.61, 37.2, 1.27] [8.51, 142.4, 0.20] [6.65, 76.1, 1.19]

2% in 50 yr [40%, 27%, 33%] [6.78, 18.3, 1.51] [8.63, 142.8, 1.04] [6.82, 64.6, 1.64]

0.5% in
50 yr

[38%, 30%, 32%] [7.03, 10.3, 1.56] [8.69, 141.4, 1.63] [7.00, 55.9, 1.83]

Source: Tehrani: et al . (2012).

'CMS-All' is also computed which represents the weighted average of all
three CMS according to the percentage of contribution of each event type.
Figure 21.3 shows that the 'CMS-All' is very close to the 'CMS-Crustal'
(Tehrani et al. , 2012).

21.5.4 Infl uence of record selection on IDA result

The infl uence of different record selection methodologies and the infl uence
of including records from different earthquake types (i.e., crustal,