Seismic Risk Evaluation of Existing Building
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Date
2020-06
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Addis Ababa University
Abstract
In spite of the advances of research in earthquake engineering in general and particularly on
seismic design codes, catastrophic losses have occurred recently in many countries in the world,
including countries in which earthquake engineering studies are priority tasks. It is clear that new
developments in earthquake resistant design can only be applied to new projects, which represent
a small part of the existing structures in a seismic area.
This thesis work investigates seismic risk assessment of nine story building located in Addis
Ababa City. ETABS software is used for non-linear static pushover analysis whereas Federal
Emergency Management Agency (FEAM) earthquake loss estimation methodology is employed
for earthquake loss estimation during risk assessment for the building model.
Pushover analysis is used in order to investigate the capacity of the study building and from
intersection of capacity curve and demand curve performance point of the building has been
determined with this estimated performance value of the building probability of reaching or
exceeding different damage state are calculated and finally with these probability of reaching or
exceeding four different damage states the total loss due to structural damage becomes 1.585B
birr The estimated value of economic losses based on the method FEMA-1999 approach
obtained by MDP (mean damage probability) value of 18.09%. This means that the building has
a small damage economic loss probability of 18.09% due to the expected earthquake scenario.
And human life loss is calculated based on the assumption that 5 people dwell in single
household. From the result it is observed that night time earthquake scenario causes high
causality than day time scenario and rush hour scenario. And for particular time earthquake
scenario the number of casualty decreases as level of severity increase.
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Keywords
Seismic Risk, Building