Civil Engineering Reference
In-Depth Information
1
IM
j
:
SA
(3.0 s) = 0.0827
Prob = 0.1
84th percentile
of realizations
10
0
0.8
0.6
10
-1
0.4
16th percentile
of realizations
Realizations
Single realization
GCIM median
G
CIM 1
6
th,
8
4t
h
p
e
r
cen
t
i
l
es
10
-2
GCIM distribution
Realizations
Single realization
KS b
o
u
nd
s,
0.2
a
=
0.
1
0
10
-1
10
0
10
1
5
10
20
50
100
Period,
T
(s)
Peak ground velocity,
PGV
(cm/s)
(a)
(b)
1
1
IM
j
:
SA
(3.0 s) = 0.0827
Prob = 0.1
IM
j
:
SA
(3.0 s) = 0.0827
Prob = 0.1
0.8
0.8
0.6
0.6
0.4
0.4
0.2
GCIM distribution
Realizations
Single realization
KS
bounds,
0.2
GCIM distribution
Realizations
Single realization
KS bounds,
a
= 0.1
a
= 0.1
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)
(c)
(d)
4.3
Realizations of the vector
IM
|
IM
j
for the particular site at an
exceedance probability of 10% in 50 years: (a) pseudo-acceleration
response spectra,
SA
; (b) peak ground velocity, PGV; (c) cumulative
absolute velocity,
CAV
; and (c) 5-95% signifi cant duration,
Ds
595 (after
Bradley, 2011b).
realization the
PGV
,
CAV
, and
Ds
595 values are below the median of the
GCIM distribution. This single realization therefore serves to illustrate the
effect of correlation between the different
IM
i
s considered.
4.6.2 Effect of weight vector on semi-automated ground
motion selection
In order to illustrate the effect of different intensity measures in the selec-
tion of ground motions, this section presents details of ground motions
selected using the previously presented algorithm for two different weight
vectors,
w
i
. In both cases, the NGA database (Chiou
et al.
, 2008) of as-
recorded ground motions is used to provide the set of prospective ground
motions which can be selected. No 'screening-criteria' of causal earthquake
parameters, such as ranges of magnitude or source-to-site distance were
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