Caracterização à tração de barras de polímero reforçados com fibra de vidro (GFRP)

Abstract

The constant search for innovations within the construction sector often comes from the principle of solving problems or increasing existing constructive methods, so that they are able to fully fulfill their requests. In the case of reinforced concrete, for example, there is a great concern of its use in aggressive means, mainly due to durability. In this respect, fiber reinforced polymer bars (FRP) arise as an alternative to replace steel for these cases. However, its application requires greater studies regarding its properties, including tensile resistance which is an important Project parameter. In this sense, this work sought to perform tensile tests, based on ASTM D7205 (2011), with polymeric fiberglass bars (GFRP) of three different diameters (8, 10 and 12mm) of the same manufacturer, aiming to determine ultimate tension, modulus of elasticity and ultimate strain. The bars and anchors were prepared according to the above standard. After the tests were performed and the properties determined, it was concluded that the 8 and 10mm bars had consistent behaviors and matched with the literature, but the 12mm bars did not have such satisfactory results compared to the others, breaking three test subjections with tensions inferior to the minimums. Among the diameters, the highest tensile strengths were achieved by the bars of: 8, 10 and 12mm, respectively. However, it was assumed that the diameter was not a determining factor in the final results of strength of this work between the tested diameters. Keywords: FRP bars; tensile tests; mechanical properties.