الفهرس 
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Abstract
This study presents an experimental and analytical investigation and comparison of the structural behavior of externally bonded R.C. beams with different methods of strengthening (steel plates, steel angels , steel channels and carbon fiber Sheets (CFRP)) . For the experimental investigation, five R.C. beams were tested, one of them was tested without strengthening to act as the control beam. The second beam was strengthened using steel plate externally bonded to the bottom surface of the beam. The third beam was strengthened using two steel angels. The forth beam was strengthened using steel channel, while the last beam was strengthened using CFRP laminate.
The test results show that, the beam strengthened with CFRP laminate recorded a slightly higher failure load compared to the beams strengthened with steel. While the beam strengthened with steel plate recorded a higher cracking load and less deflection, steel strains, concrete strains and cracks width compared to the CFRP laminate strengthened beam. Results also showed that the beam strengthened with CFRP laminate failed by premature concrete cover separation failure. The theoretical study using the Finite Element Method (FEM) package (ANSYS11) shows a good agreement with the experimental study .