Análise teórica e experimental de vigas de concreto armadas com barras não metálicas de GFRP

Abstract

Steel reinforcement replacement aims an increase at the durability of structures with corrosion and electrical magnetic problems. But, inserting a new material at the civil construction industry demands specifications of its composition, behavior and procedures for its utilization. This work is a flexural behavior analysis of reinforced concrete beams reinforced with GFRP bars. To make this, a technical literature research was made considering the pioneer until the most recent researches, and components and concrete reinforced beams tests were done. GFRP bars properties tests went from the determination of its strains X stress diagram to its tension resistance. GFRP reinforced beams were submitted to four points flexural tests and the results compared with a CA-50 steel reinforced beam also submitted to the flexural test. The specimens showed the influence of GFRP properties at the behavior of the structure. For example, longitudinal bars large strains and the large displacement of the beam were determined by GFRP bars low longitudinal elastic modulus. Continuing the studies evolving GFRP bars is certainly a need. New researches might be able to design a way to use the composite properties to improve the structure behavior.

Comportamento de vigas de concreto armadas com barras de GFRP

“…onde é a deformação da armadura interna de FRP na ruptura da viga, dada em ‰ pela Equação P a g e | 212 Revista Ibero-Americana de Ciências Ambientais v.12 -n.3  Mar 2021 (BENMOKRANE et al, 1996;TAVARES, 2006;CHITSAZAN et al, 2010;ABDELKARIM et al, 2019) sendo duas em concreto armado, outras duas armadas com barras longitudinais de GFRP e estribos de aço e as restantes armadas com barras longitudinais e estribos de GFRP. O parâmetro variado nos ensaios foi a taxa de armadura longitudinal das vigas (0,88% e 2,02%), que neste trabalho é definida como a relação entre a área total da armadura longitudinal e o produto entre a largura e a altura útil da seção transversal da viga.…”

Behavior of reinforced concrete beams reinforced with GFRP bars

“…Beam reinforcement was determined based on the ACI 440 [1] and [2] and the fib 9.3 task group [12]. The procedure can be found elsewhere (Tavares [17] and [18]). …”

Bending reinforced concrete beams with glass fiber reinforced polymer bars: an experimental analysis

“…When comparing construction with other industries, it becomes obvious that it is lagging behind, since it has long used concrete, wood and steel as its main materials. Yet, analyzing the concrete throughout history, it has not changed significantly since the 1930s [1]. According to Medeiros and Helene [2], this is because concrete has always been an extremely durable material, with no concern for its performance in terms of service life.…”

“…Furthermore, reinforced concrete with steel bars is the most used structural system in Brazil. Therefore, improvements to this system regarding service life and maintenance cost are necessary, mainly in coastal structures, such as bridges, subways, and slope abutments, which are the most critical cases [1].…”