الفهرس 
Abstract
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Abstract
Slender steel I-columns (3 plates elements) are used in a variety of
structural engineering applications, for their high strength to weight ratios
and their relatively good strength. Large portions of plates composing the
columns are subjected to compressive stresses which may cause local
buckling in flanges and web. This could be due to initial and geometric
imperfection during the fabrication process. In addition to imperfection,
global buckling of member may happen.
So, in this thesis we focus our work on studying the effect of local
and global buckling in column and showing the effect of using horizontal
stiffeners on the load capacity. Several buckling modes for steel slender
sections have been studied.
In this thesis also the behavior of slender steel I-column is studied
through numerical analysis and experimental work. A validation of the
numerical model through previously published works and the
experimental results is carried out. A satisfactory agreement was obtained
between F .E. and experimental work. A parametric study for different
effective parameters is carried out. These parameters are web depth to
web thickness ratio, out-stand width of flange to its thickness, column
slenderness and horizontal stiffeners locations. Using horizontal stiffener
at web leads to an increase in the column failure load up to 50% for short
columns with large dw/tw and small C/tf.
A series of tests has been conducted on five slender steel I-columns
to study the behavior of these columns under axial compression force and
the effect of horizontal stiffeners. The tested columns are divided into
two categories : short column with Lzr =50 and semi long column with
Lr = 100, with and without horizontal stiffeners. Experimental results