الفهرس 
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Abstract
With the increment use of the Fiber Reinforced Plastic (FRP) structure members in the different civil engineering structure applications, the FRP members’ properties needed to be studied. Also as the full characteristics of the FRP materials are not fully identified, and many countries still do not have a solid code for the use of those materials.This research aims to investigate the buckling behavior of FRP columns, and the direct effect of changing the column’s physical properties beyond such behavior. Also, an empirical load formula is to be introduced to predict the buckling load capacity associated with different physical properties of the column due to the changing of the fiber orientations. In this research, finite element analysis is done to study the buckling behavior of the FRP columns. Many columns’ cross section shapes are studied (H-shape, I-shape, square tube, rectangular tube, and rectangular tube with internal stiffeners) were studied. For every column shape, different combinations of layers orientations were modeled to study the effect of changing the cross section physical properties (Young’s modulus, in both the fiber’s directions and the transverse direction (Eyy), (Exx), also the shear modulus (G), as well as Poisson’s ratios (νxy), (νyz)) on the columns buckling
behavior. The maximum and minimum buckling load capacities are identified with the different layers orientations.Different column end conditions were tested (Hinged-Fixed, Fixed- Fixed, Fixed-Free) to study the relation between their buckling failure loads with the Hinged-Hinged end conditions buckling failure loads. The relation between the buckling behaviors around both the minor and major inertia column’s cross section is studied.Then a modified equation is introduced to Zureick buckling load empirical equation (modified Euler buckling equation), to calculate the effect of changing the layers orientation and the percentage of the layers oriented toward the load on the buckling column load.