Using a performance-based earthquake engineering (PBEE) approach to estimate structural performance targets for bridges - Seismic Risk Analysis and Management of Civil Infrastructure Systems - page 543

1

0.1

Data wrt S a (long)
Longitudinal model
Data wrt S a (trans)
Transverse model

0.01

0.1 1

IM (horizontal S a )

20.6 Distribution of Type 1-EDP (in natural log units) vs. the
transverse and longitudinal IMs.

1

Data wrt S a (long)
Longitudinal model
Data wrt S a (trans)
Transverse model

0

-1

-2

-3

-4

0.01 0.1 1

IM (horizontal S a )

20.7 Distribution of Type 2-EDP (in natural log units) vs. the
transverse and longitudinal IMs.

horizontal S a at the longitudinal period is a better predictor of the response
in terms of effi ciency. Figure 20.7 presents the actual data points and two
PSDMs that model the same structural response data using different IMs;
S a at the longitudinal period of the bridge and Sa at the transverse period