Estudo de resistência à tração e seu comportamento em vigas de concreto armado de barras de PRFV

Abstract

Reinforcement corrosion in reinforced concrete structures is one of the main causes of pathologies in buildings and infrastructure works, compromising the stability and safety of the buildings, as well as being a factor of economic loss. As an alternative to mitigate this problem, Glass Fiber Reinforced Polymer (GFRP) bars in order to reinforce concrete structures are corrosion-resistant and less polluting in their manufacturing process. Currently, there are already examples of projects around the world that use this polymeric material, but with few applications are known in Brazil. Therefore, the present research focuses on studying the characteristics of tensile strength of GFRP bars compared to steel bars, as well as evaluating their behavior in concrete beams through an experimental program, in order to contribute to the construction of a technical framework on the subject. To achieve these objectives, GFRP bars and steel bars were submited to tension tests and reinforced concrete beams subjected to four-point bending were tested. It was possible to conclude that GFRP bars have higher tensile strength comparing to steel bars, with differences in their failure modes. With the assays on reinforced concrete beams, it was verified that different behaviors were obtained, being possible to verify analysis about the opening of cracks, displacement in the center of the span and ultimate resistance.