The article presents the test results of reinforced concrete rectangular cross-section beams strengthened with external flexible steel bars. Lack of rigid elements in the strengthening system reduces the weight and the cost for its implementation. The proposed strengthening system is regulating. It shows an increase in the carrying capacity up to 4.4 times, while significantly reducing beam deformability. Besides compression the bottom strained beam zone, the proposed system unloads the upper compressed beam fiber.
