Civil Engineering Reference
In-Depth Information
1
10
0
0.8
0.6
10
-1
0.4
10
-2
0.2
50% in 50 yrs
10% in 50 yrs
1
%
in
5
0
y
r
s
0
10
-1
10
0
10
1
5
10
20
50
100
Period,
T
(s)
Peak ground velocity,
PGV
(cm/s)
(b)
(a)
1
1
0.8
0.8
0.6
0.6
0.4
0.4
0.2
0.2
50% in 50 yrs
10% in 50 yrs
1
%
i
n
5
0
y
r
s
50% in 50 yrs
10% in 50 yrs
1
% in 50
y
rs
0
0
0.1
0.2
0.5
1.0
2.0
2
5
10
20
50
100
Cumulative absolute velocity,
CAV
(g s)
5-95% significant duration,
Ds
595 (s)
(d)
(c)
4.7
Distributions of ground motions selected for three different
exceedance probabilities: (a) pseudo-acceleration response spectra,
SA
; (b) peak ground velocity,
PGV
; (c) cumulative absolute velocity,
CAV
; and (d) 5-95% signifi cant duration,
Ds
595 (after Bradley,
2011b).
Table 4.3
Median
IM
j
values of the selected ground motions for various
exceedance probabilities (ratios with the 10% in 50 years value are shown
in brackets)
Exceedance
probability
SA
(0.1)
SA
(0.3)
SA
(1.0)
SA
(3.0)
PGV
CAV
Ds
595
50% in 50 yrs
0.18
(0.95)
0.16
(0.52)
0.09
(0.5)
0.038
(0.46)
10.5
(0.48)
0.33
(0.49)
17.9
(1.1)
10% in 50 yrs
0.19
0.31
0.18
0.083
22.0
0.68
15.7
1% in 50 yrs
0.27
(1.4)
0.43
(1.4)
0.27
(1.5)
0.17
(2.0)
37.5
(1.70)
0.84
(1.2)
16.8
(1.1)
Source: Bradley (2012b).
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