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Abstract
Reinforced Concrete is the most commonly used construction material in many
countries including ”Egypt”. Reinforced Concrete is used in the construction of
many types of structures and components, including slabs, walls, beams, frames
and columns on which the study in this thesis is focused. Reinforced Concrete
elements are designed to satisfy safety, serviceability, functionality and economy
which is in fact the most important point guiding the design and the choice of the
suitable and most economic statical system of the whole building since that all
other design factors can be easily satisfied during the design procedure just by
satisfying different safety provisions (conditions) mentioned in different
International Building Codes.
Reinforced Concrete Columns, the main interest of this thesis, are the most
important members besides foundations in the whole building. They are recognized
as the structural vertical compression members which resist all vertical loads as
well as part of the lateral loads acting on the building then transmit those loads to
the foundation then to the soil. Further, one of the main functions of the columns in
any building is their contribution in the overall stiffness of the structure of that
building. According to the different International Building Codes, columns are
classified according to two main points of view either geometrically (Related to
their geometric properties) or structurally (Related to their structural properties
such as Braced or Unbraced Columns). And since that this classification is
mentioned in the different International Building Codes in different manners, it was
decided to compare these different definitions to that of Egyptian Code of Practice
which results sometimes in huge columns cross sections when compared to those
mentioned according to other building codes.
from this huge gap between the cross sections obtained by Egyptian Code of
Practice and those by the other building codes due to its definition as braced or
unbraced, it was decided to study the lateral stability of the skeletal reinforced
concrete buildings in order to clarify the term “Braced & Unbraced Buildings”,
trying to reach a new logic, realistic definition of the term Braced & Unbraced
Buildings to reduce the economic gap in differentiating between both types of
buildings in Egyptian Code of Practice compared with other International Building
Codes. The study of this point in this thesis was concerned also with studying the
factors that the Egyptian Code of Practice doesn’t take into consideration in
differentiating between braced and unbraced buildings in addition to a comparison
between Egyptian Code of Practice and different International Building Codes.