الفهرس 
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Abstract
It is well known that I-steel plate girders (IPGs), obtained by welding web plate elements and flanges. When these girders are loaded in their principle planes, may buckle out of plane if they don’t have sufficient lateral stiffness. These girders can buckle by lateral displacement and twisting of the cross-section. This phenomenon is called lateral torsional buckling (LTB). Another type of buckling is known as local buckling (LB) in which compression elements can buckle locally over a short length of the member with local changes in the cross-section shape. It is important to know that two modes of buckling may interact to consist anther mode of buckling called by lateral distortional buck-ling (LDB). The present thesis investigates the LDB of stainless steel IPGs. The stainless steel material has been chosen due to its high strength, durability, weldability and its esthetically clean surface with high corrosion resistance. The main goal from this work is to study the flexural strength of LDB of stainless steel IPGs using finite element (FE) and to compare the results of the flexural strength from FE to its counterpart in AS4100 and EN1993. Accordingly, The thesis considers two analyses phases (linear and non-linear analysis). The objective of the linear analysis is to get the value of the moment gradient coefficient factor (𝐶𝑏) for LDB of stainless steel IPGs. Also from this analysis, the different parameters which effect on the strength of IPGs are to be studied.