Performance Assessment of Representative Unreinforced Masonry Buildings in Addis Ababa As Per
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Date
2017-04
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Addis Ababa University
Abstract
Unreinforced Masonry (URM) buildings constructed earlier than 1930 are the largest
stoke of buildings made in those years in many parts of the world. Such buildings are
also common in older parts of Addis Ababa, which includes; many private residential,
buildings, governmental offices, schools, hospitals, spiritual places, and market centers;
these buildings were constructed in the absence of mandatory earthquake design
requirements and unquestionably recognized as the type of construction most vulnerable
to earthquakes.
According to previous code EBCS 8 1995 seismic zoning, Addis Ababa was categorized
under Peak Ground Acceleration of 0.05g. However, the revised Ethiopian Standard
codes ES EN 1998:2015 specified a value 0.1g. This increased estimate indicates that
Addis Ababa is no longer in low seismic zone and there is related posed seismic hazard.
The main goal of this study is to develop a simplified performance assessment procedure
to URM buildings so that practitioners can be able to estimate quicker the status of
similar buildings and ultimately to propose valuable intervention works to avert posed
seismic hazard.
In particular simplified hand calculation approach which includes defining material
properties from non destructive tests and visual data have been used to analyze sample
building. The commercially available, finite element software tool, SAP2000, is used. So
that to model a case-study-building. Results found both from the hand calculation and
3D modeling are compared which can be seen in respective parts of this thesis; and
finally the performance level status of the sample building is evaluated.
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Structures