الفهرس 
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Abstract
The concept of prestressing steel structures has not been widely considered, despite a long and successful history of prestressing concrete members. Several analytical and experimental studies of externally prestressed composite beams were reported in literature. These researches did not consider the effect of partial interaction between the concrete slab and the steel beam on the behavior of prestressed beams. The slippage between the cables and saddles was not analyzed in these researches. Also, the influence of long-term effects of the concrete slab and the relaxation of the cables on the behavior of externally prestressed beams with partial shear interaction was not reported in these researches. All international codes did not br>give design guide lines or design recommendations for externally prestressed composite beams with partial shear interaction. Also, these codes did not give design recommendations for the influence of long-term effects on the behavior of prestressed composite beams with partial shear interaction. Thus, the objective of this research is to deepen the understanding of the behavior of externally prestressed composite beams by the several of parametric study. A theoretical investigation was conducted using the finite element package COMSOL MUL TIPHYSICS. The results of the finite element model were verified by checking with previous researches in literature. In this research, some design guide lines and design recommendations of composite prestressed beams will be presented.