With the deterioration of this nation's infrastructure comes the growing need for effective means of rehabilitating structures. Possibly one of the most challenging tasks is to upgrade the overall capacity of concrete structures. The utilization of composite materials in rehabilitating such structures represents an innovative use of new technology. Laboratory experiments have recently been conducted on a series of reinforced concrete T-beams to study the effectiveness of using externally applied composite fabrics as a method of increasing a beam's shear capacity. In the experiments, woven composite fabrics made of aramid, E-glass, and graphite fibers were bonded to the webs of T-beams using a two-component epoxy. The beams were loaded in flexure and tested to failure. All beams failed in shear. The ultimate strengths of the externally reinforced beams were 60–150% higher than the strengths of beams without external reinforcement. This paper presents analyses of the externally reinforced concrete beams using finite element models. The quality of numerical simulations are assessed by comparing them with experimental results. To gain better insight into the behavior of externally reinforced concrete T-beams, several numerical parametric analyses were also performed. The significance of the results of these analyses with respect to potential retrofits of existing concrete beams in the civil infrastructure is addressed.