Abstract
abstract: There is a recurring need to construct in places where environmental aggressiveness is very high, such as tidal-splash sites, chemical industries, etc. In these places, steel bars, commonly used for concrete reinforcement, can suffer deterioration, losing cross-sectional area and consequently the resistant capacity. In this regard, Glass Fiber Reinforced Polymers (GFRP) bars can replace steel because of its high strength to harsh environments, low weight and high tensile strength. Thus, this work aimed to compare reinforced concrete beams with steel bars and GFRP bending bars using the procedures indicated in ABNT:NBR 6118 and ACI 440.1R-15, respectively. Experimental three-point flexural tests were performed on six concrete beams, three reinforced with steel bars and three reinforced with GFRP bars. The beams were designed for centered point loads of 23.5 kN, 37.5 kN and 57 kN, and for each load one beam was reinforced in steel and one in GFRP. As main conclusions, it can be said that the beams reinforced with GFRP bars presented greater transverse displacements due to the low modulus of elasticity of this material. In addition, the beams presented rupture loads close to each design load, showing agreement in the recommendations of the two normative documents. Comparing the maximum loads of steel and GFRP beams, ratios of +9.3%, -3.2% and -3% were obtained for beams designed for 23.5 kN, 37.5 kN and 57 kN, respectively. Also, that variations in design loads cause greater variation in the longitudinal reinforcement rate of GFRP bar-beams compared to steel-bar beams.
Highlights
Technology is constantly and rapidly advancing, and this can be observed in all industries, where new products and materials are constantly made available
The beam ruptured abruptly, which is consistent with the brittle linear behavior of the Glass Fiber Reinforced Polymers (GFRP) bars
The mode of failure of the concrete beam occurred due to the tensile rupture of the GFRP bars, as expected, and according to the calculation for this beam, in which the bars were designed considering their tensile strength. This mode of failure of the concrete beam is the one that uses the GFRP bars to their maximum, it is the form that requires the greatest care, due to the brittle form of rupture
Summary
Technology is constantly and rapidly advancing, and this can be observed in all industries, where new products and materials are constantly made available. 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. 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. According to Bolina et al [3], a concern with the principles of durability was what started to constitute studies linked to the science of materials used in construction. The belief that buildings were “forever” started to dissolve, and a restriction on the indiscriminate use of materials in all circumstances began to gain strength. A concern with constructing a usable building, and ensuring that it was a durable product, began to take place
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
