الفهرس 
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Abstract
This thesis presents a theoretical analysis of composite beam sections. The considered composite section consists of two materials bonded together by a flexible bond layer. The top profile material has a flexural rigidity and. the bottom one has an axial resistance only. Relative shear deformation of the bond material is considered. The differential equations of the proposed model” are developed and then solved theoretically. Two methods of solution have been used. These are the transport matrix method and the finite element method. The solution methods are extended in order to solve frames as well as beams. Sandwich beams with top profiled face and reinforced concrete beams strengthened by epoxy-bonded steel plates are two types of examples . which have been used to verification the theoretical model. Comparisons between the theoretical model and the available experimental results show good agreement. Also, a parametric study on sandwich beams is carried out in order to examine the influence of core thickness, its shear modulus and inertia of top profiled face on the relative shear deformation, bending moment and deflection. A similar study is performed on reinforced concrete beams strengthened by epoxy- bonded steel plates. Design curves of sandwich beams are given for different cases of loading and different boundary conditions .Finally, computer programs to implement the methods of solution are developed and employed to solve frames as well as beams.