Flexural behavior of concrete beams reinforced with glass fiber reinforced polymer and steel bars

Farías, Cristian; Pessi, Sarah Lodeti; Wanderlind, Augusto; Piva, Jorge Henrique; Pavei, Elaine

doi:10.7764/rdlc.21.3.506

Cited by 1 publication

(1 citation statement)

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“…The findings of the study showed that concrete beams containing M-sand and reinforced with GFRP possessed a 12% higher load than corresponding beams with river sand and reinforced with steel, although the lower modulus of elasticity of the GFRP bars affected the post-cracking stiffness. Farias et al [23] compared the flexural behavior of GFRP-reinforced concrete beams with corresponding concrete beams containing a steel area equal to 40% of the fiber glass area. The results of the study showed that the beams with GFRP bars possessed a 64% higher flexural resistance and exhibited less deflection compared with those containing steel bars.…”

Section: Literature Reviewmentioning

confidence: 99%

Effect of Rebar Harsh Storage Conditions on the Flexural Behavior of Glass FRP Concrete

Tabsh,

Tamimi,

El-Emam

et al. 2024

Sustainability

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Nowadays, fiber-reinforced polymer (FRP) has become a widely accepted alternative reinforcement to steel bars in concrete members due to its many sustainability traits, as represented by its high strength-to-weight ratio, corrosion resistance, non-conductive properties, and electromagnet neutrality. However, FRP bar exposure for an extended period of time to harsh environmental conditions and chemicals can have an adverse effect on their mechanical properties. In this investigation, glass FRP bars were exposed to indoor controlled temperature, outdoor direct sunlight, outdoor shade, seawater, and alkaline solution for six months prior to using them as reinforcement in concrete flexural members. This research involves the fabrication and testing of five pairs of 3 m-long concrete beams with 200 mm by 300 mm cross-sections embedded in the tension zone with the exposed GFRP bars. The 10 beams were instrumented with strain gauges and tested following a four-point loading scheme using a hydraulic jack attached to a rigid steel frame. Crack width records from the tests showed the inferior serviceability of the beams that contained rebars stored in an outdoor environment relative to the control beams. GFRP bar exposure to an alkaline solution or outdoor direct sunlight slightly affected the cracking and ultimate moment capacities, reducing them by 5% and 3% in terms of the same parameters as the controlled indoor exposure, respectively. The influence of GFRP bar exposure to open-air shade or sunlight decreased the pre-cracking stiffness by 25% and flexural ductility by 10–20% when compared with the control specimens. The predicted ultimate flexural strength using the ACI 440 provisions gave comparable results to the experimentally obtained values. A simple mathematical equation that envelops the moment–deflection relationship for GFRP over-reinforced concrete beams and only requires information about initial cracking and ultimate flexural conditions is proposed.

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Section: Literature Reviewmentioning

confidence: 99%