Assessment and Retrofitting Mechanisms of Existing Reinforced Concrete Buildings
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Date
2017-11
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Addis Ababa University
Abstract
In the past many cities around the world have been struck by a range of earthquakes which have
resulted in the loss of many lives along with the destruction of properties. Cites have been turned
into dust and rubbles. Earthquake causes different intensities of shaking at different locations and
the damage induced in buildings at these locations is also different. In many countries, tools have
been designed and incorporated in their national building codes to decrease the hazards caused by
earthquakes starting from the inception of design to the final stage of construction to harmonize
designs for the reduction of seismic risk.
The goal of this study is to focus on the solution mechanisms to be addressed in strengthening of
older and existing reinforced concrete framed building to ensure an appropriate level of safety for
occupants in the event of an earthquake. As it is known, the earthquake design parameters have
been revised in the new Ethiopian Building Code Standard. According to EBCS 8: 1995, Addis
Ababa was categorized in zone 2 in the seismic hazard map. But the new revised code locates the
city in zone 3, which doubles the peak ground acceleration. More over the city is expanding
towards the outskirts of Addis Ababa like Akaki, Bole Arabssa.
In this study, it is considered that the building stock designed earlier before the revision of the code
will not survive an earthquake based on the new peak ground acceleration. This brings a question
on how these buildings will be strengthened before this kind of destruction and loss of life and
property occurs in the city.
Therefore, the outcome of this study will benefit the owners as well as the authorities on the
retrofitting procedures as well as solution mechanisms of reinforced concrete framed building
structures are undertaken.
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Keywords
words-Seismic risk, Serviceability, Seismic hazard, Peak ground acceleration, Retrofitting procedures, Seismic vulnerability, EBCS-8:1995