Análise não-linear de vigas de concreto armado reforçadas à flexão com fibra de carbono.

Abstract

Reinforced concrete has shown for more than a century, be a building material of good performance and structural adequacy in the resistance to the efforts originated from the acting actions. Despite its performance characteristics, the lack of maintenance of structures jointly with design flaws or execution has generated pathologies that reduce their conditions of projects. The technique of application of carbon fiber reinforced polymers (CFRP) is an alternative of strengthening and repair of the concrete structures that emerged from development of the research of strengthening using glued metal plates, solution that although inexpensive, presents disadvantages such as steel corrosion, low resistance to fire, high weight and difficulty in handling. This work aims to develop through the Finite Element Method (FEM) the nonlinear analysis of reinforced concrete beams strengthened in bending with CFRP varying the number of strengthening layers and compare the results with the analytical results obtained using the Classical Beam Theory and with the experimental results obtained by Vieira (2014). The DIANA program was used in the numerical analysis. This program is a finite element computational package, based on the displacement method and developed by civil engineers. The modeled beams were divided into three groups called VA, VB and VC with different reinforcement ratios. Regarding the reference beams (not reinforced), the DIANA provided expected results. In relation to the strengthened beams, due to premature ruin, comparison of numerical analysis with experimental was difficult, but observing the graphs of load -displacement curves was noted that the number curves were approaching the experimental curves in the final phase of test before rupture.