This research aimed to analytically investigate the shear strength of reinforced concrete (RC) T-beams strengthened in shear with Carbon Fiber Reinforced Polymer (CFRP) Sheets. Based on the experimental results, obtained by both the author and Farghal 2004, concerning the shear strength of RC beams strengthened in shear with CFRP Sheets, a study to address the applicability of the proposed analytical models (Egyptian code and American Concrete Institute 'ACI' code) to predict the shear strength of the strengthened beams is presented in this research. The proposed models showed an underestimation in predicting the shear strength of strengthened RC T-beams. However, these models showed a better estimation in case of beams of rectangular cross-section. Both of the proposed models haven't taken into account the effect of the flange of the T-section when computing the shear strength of strengthened T-beams and consequently showed an underestimation. To treat such a problem and on the basis of both the results of the experiments and the observed failure behavior, the author suggests a modification in both proposed codes "Modified Egyptian code" and Modified ACI code". Such a modification takes into account the effect of the shape of cross-section in computing the contribution of the concrete to the shear strength. As a consequence, the shear strength of RC strengthened T-beams predicted according to the modified models showed an acceptable approach to the experimental results.