Deaggregation of seismic loss of spatially distributed buildings |
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Authors: | K Goda H P Hong |
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Institution: | (1) Department of Civil and Environmental Engineering, University of Western Ontario, London, ON, Canada, N6A 5B9 |
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Abstract: | The catastrophic nature of seismic risk resides in the fact that a group of structures and infrastructure is simultaneously
excited by spatially correlated seismic loads due to an earthquake. For this, both earthquake-to-earthquake (inter-event)
and site-to-site (intra-event) correlations associated with ground motion prediction equations must be taken into account
in assessing seismic hazard and risk at multiple sites. The consideration of spatial correlation of seismic demand affects
aggregate seismic losses as well as identified scenario seismic events. To investigate such effects quantitatively, a simulation-based
seismic risk model for spatially distributed structures is employed. Analysis results indicate that adequate treatment of
spatial correlation of seismic demand is essential and the probability distribution of aggregate seismic loss can be significantly
different from those based on the assumptions that seismic excitations are not correlated or fully correlated. Furthermore,
the results suggest that identified scenario events by deaggregation in terms of magnitude and distance become more extreme
if the spatial correlation is ignored. |
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Keywords: | Aggregate seismic loss Scenario earthquakes Seismic loss estimation Seismic risk deaggregation Spatial correlation of seismic demand |
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