Reinforced concrete elements, such as beams, slabs and columns, may be strengthened in flexure through the use of FRP composites epoxy-bonded to their tension zones, with the direction of fibers parallel to that of high tensile stresses (member axis). The calculations described below address both the Ultimate Limit State (ULS) and the Serviceability Limit State (SLS).
For the design, the parabola-rectangular method is used by the software to determine the compressive strain and stress ratio of the concrete across the section´s height (Fig. 2-1).