الفهرس 
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Abstract
An investigation of the behavior of strengthened RC elements under cyclic loading is presented. To get better understanding of the behavior of strengthened elements under cyclic loading, their behavior under static loading is investigated first. Two models are developed to simulate the performance of the strengthened elements. under static and cyclic loading. An analytical model is produced to help understanding the behavior of strengthened RC beams under flexure due to static loading. The model takes into account the materials properties of concrete, reinforcing steel, and Fiber Reinforced Polymers (FRP). Results of the analytical model are compared to results of static experimental tests available in the literature. in order to verify the analytical model. Results show good agreement between experimental and analytical model results. A finite element model is produced to simulate the behavior of the strengthened RC beams under either static or cyclic loading. The produced model takes into consideration properties of the used materials.