Reforço à Flexão de Vigas de Concreto Armado com Fibras de Carbono Utilizando o ACI 440.2R e a NBR 6118 Adaptada

Abstract

Reinforcement with carbon fiber composites started in Switzerland as an alternative to steel plate bonding that were not viable in some aesthetic, agility and corrosion situations. Japan was also a pioneer in the use of these composites as structural reinforcement. The carbon fiber reinforced polymer has gained recognition due to its high mechanical properties, low specific weight, versatility and durability. This technique is widespread and standardized in several countries. This research has a general objective to brink knowledge and discussion about the structural reinforcement using carbon fiber composites and proposing a standardization of this technique to guarantee the quality of the projects. As a reference for structural reinforcement design using fiber reinforced polymers, the method proposed by the American Standard ACI 440.2R was used, and later this method was adapted to NBR 6118/2014, for the validation of the methodology, numerical examples were performed. The results showed a difference between the Standards involving the stress-strain concrete curve, reduction of the strength that affects, directly, the stress calculation. However, the both solved examples, the rupture is governed by the FRP system. The propose of this research is to serve as a starting point for an appropriate standardization to the Brazil’s characteristics.