الفهرس 
AcknowledgementsOnly 14 pages are availabe for public view
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Abstract
Earthquake behavior of structural systems depends strongly on geometry of
the building. Structural irregularities are one of the major causes of damage
amplification under seismic action. Past earthquakes, indeed, have shown that
buildings with irregular configuration or asymmetrical distribution of structural
properties are subjected to an increase in seismic demand, causing greater damages.
If the earthquake damages are examined, it can be seen that structures which have
overhangs are damaged more than the others. In this study, the effect of overhangs
of RC frames on linear and nonlinear lateral response of the structure is evaluated.
Also, torsional irregularity factors and torsional moment ratios of corner columns
are evaluated. The research extends to evaluate the seismic performance of studied
buildings and possible retrofit strategies.
The studied buildings are either 6 or 9-story buildings. They have 4@5 m bays
along X and Y directions. Five different overhang alternatives and three different
overhang lengths are used in the modeling.
Structural systems are modelled using SAP2000 software. The buildings are
investigated under earthquake load represented by response spectrum analyses,
equivalent static load and the nonlinear static analysis (pushover analysis) methods.
Lateral displacement, inter-story drift, base shear, torsional irregularity factors, and
torsional moment ratios were the key parameters to study the behavior and
ascertain performance points of all buildings.