Optimization of reinforced concrete beams with FRP rebars and sheets in different installation methods by finite element method

Flexural reinforcement of reinforced concrete beams with composite materials is one of the most common methods of structural reinforcement. Composite materials have several advantages such as ease of implementation, easy access, relatively low cost, increased bearing capacity, low weight, etc., but despite all these advantages, the use of these materials also has disadvantages, which can be Premature and sudden bending failure in beams reinforced with these materials, which occurs due to premature rupture of composite materials or even deterioration of the joint area due to lack of attention to the stability of epoxy adhesive from the concrete surface in the tensile zone of the beam, noted. In this paper, by designing a computational program with Abacus software, 7 examples of reinforced concrete beam reinforcement design with GFRP rebar by near-surface installation method (NSM) and its integration with various FRP sheet enclosure cases taken from a This is a laboratory study, an attempt was made to prevent premature failure of the reinforced beam and to be able to use the maximum capacity of GFRP rebar. It is noteworthy that in modeling this reinforcement design with composite materials, the effect of ultimate adhesion resistance and failure or deterioration of epoxy adhesive between NSM rebar and concrete surface is important, so in this modeling of the joint area which is epoxy adhesive modeling and its behavior Has been examined. The use of this reinforcement method with four NSM rebars and FRP sheets increased the final bearing capacity by more than 60% compared to conventional reinforced concrete beams.