الفهرس 
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Abstract
The study of multi-storey buildings composed of a combination of some concrete
floors and some steel floors is a complex process especially when studied under the
effect of the earthquakes.
In this thesis, the seismic behaviors of hybrid structures which have
statical systems of reinforced concrete frames for the lower floors and steel
frames for the upper floors were studied.
Nowadays, Steel-Concrete hybrid constructions are very popular; due to
their advantages over conventional concrete and steel constructions. Concrete
structures are bulky and impart more seismic weight and deflection whereas
Steel structures exhibit less deflections and more ductility, which is beneficial
in resisting earthquake forces. Hybrid Construction combines the good
qualities of both steel and concrete along with a less cost, speedy
construction, fire protection etc.
The main idea of this thesis was to prepare a structural model to
investigate tall building using one of the most renowned structural analysis
program (ETABS).
Comparative study of seismic performance of 30 storey structures under
seismic conditions to zone 2A with UBC 1997, and with different numbers of
concrete and steel stories were designed to resist an earthquake.
All frames were designed under the same gravity loads, and the same
boundary conditions.
Equivalent Static Method, Response Spectrum Method, and load Time
History Analysis method; all were used for conducting seismic analysis. The
main working loads namely dead load and seismic load were defined
according to (UBC 1997). The model created to investigate different
parameters as the seismic behavior, base shear, storey displacement, storey
drift and overturning moment. from the comparative study, it was concluded
that the Steel buildings are the most efficient type of buildings in terms of
seismic behavior.