Serviceability and Flexural Behavior of Concrete Beams Reinforced with Basalt Fiber-Reinforced Polymer (BFRP) Bars Exposed to Harsh Conditions

Alkhraisha, Hakem; Mhanna, Haya H.; Tello, Noor; Abed, Farid

doi:10.3390/polym12092110

Cited by 19 publications

(9 citation statements)

References 29 publications

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“…Much research has been conducted to investigate the tensile behavior of FRP bars, ranging from GFRP [50] and CFRP [66], to BFRP [74,75] and AFRP [76]. The FRP bars do not exhibit any plastic behavior under tensile loading and remain linearly elastic until their ultimate strain [77,78]. Since fibers play a significant role in tensile strength, it can be stated that bars with the same diameter, appearance, and processing may have different strengths, depending on their fiber to matrix ratio [79].…”

Section: Behavior Of Frp Bars Under Tensionmentioning

confidence: 99%

A Comprehensive Review of the Effects of Different Simulated Environmental Conditions and Hybridization Processes on the Mechanical Behavior of Different FRP Bars

et al. 2022

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When it comes to sustainability, steel rebar corrosion has always been a big issue, especially when they are exposed to harsh environmental conditions, such as marine and coastal environments. Moreover, the steel industry is to blame for being one of the largest producers of carbon in the world. To supplant this material, utilizing fiber-reinforced polymer (FRP) and hybrid FRP bars as a reinforcement in concrete elements is proposed because of their appropriate mechanical behavior, such as their durability, high tensile strength, high-temperature resistance, and lightweight-to-strength ratio. This method not only improves the long performance of reinforced concrete (RC) elements but also plays an important role in achieving sustainability, thus reducing the maintenance costs of concrete structures. On the other hand, FRP bars do not show ductility under tensile force. This negative aspect of FRP bars causes a sudden failure in RC structures, acting as a stumbling block to the widespread use of these bars in RC elements. This research, at first, discusses the effects of different environmental solutions, such as alkaline, seawater, acid, salt, and tap water on the tensile and bonding behavior of different fiber-reinforced polymer (FRP) bars, ranging from glass fiber-reinforced polymer (GFRP) bars, and basalt fiber-reinforced polymer (BFRP) bars, to carbon fiber-reinforced polymer (CFRP) bars, and aramid fiber-reinforced polymer (AFRP) bars. Furthermore, the influence of the hybridization process on the ductility, tensile, and elastic modulus of FRP bars is explored. The study showed that the hybridization process improves the tensile strength of FRP bars by up to 224% and decreases their elastic modulus by up to 73%. Finally, future directions on FRP and hybrid FRP bars are recommended.

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Section: Behavior Of Frp Bars Under Tensionmentioning

confidence: 99%

A Comprehensive Review of the Effects of Different Simulated Environmental Conditions and Hybridization Processes on the Mechanical Behavior of Different FRP Bars

et al. 2022

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“…The utilization of fiber-reinforced polymer (FRP) reinforcement in engineering is widespread [ 3 , 4 ]. The composite reinforcement may be made of glass fiber-reinforced polymer (GFRP) [ 5 ], aramid fiber-reinforced polymer (AFRP) [ 6 ], basalt fiber-reinforced polymer (BFRP) [ 7 ] or carbon fiber-reinforced polymer (CFRP) [ 8 ]. Of various FRP composites, carbon fiber-reinforced polymer (CFRP) possesses the best resistance to creep, namely, it can sustain around 80% of the tensile strength without experiencing creep rupture [ 9 , 10 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Tendon-Related Variables on the Behavior of Externally CFRP Prestressed Concrete Beams

Lou

Pang

2023

Materials

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This work assesses the flexural performance of prestressed concrete beams with external carbon fiber-reinforced polymer (CFRP) tendons, focusing on tendon-related variables. A finite element analysis (FEA) method is verified. A numerical parametric analysis of prestressed concrete beams with external CFRP tendons is carried out. Four tendon-related variables are considered, namely, the area, initial prestress, depth and elastic modulus of tendons. The analysis shows that flexural ductility decreases as the tendon area, initial prestress or elastic modulus increases but is insensitive to the tendon depth. The ultimate tendon stress increment (Δσp) is influenced by all of the four variables investigated. JGJ 92-2016 (Chinese technical specification for concrete structures prestressed with unbonded tendons) significantly underestimates Δσp and, hence, is over-conservative for the strength design of these beams. An equation is proposed for calculating Δσp, taking into account all four variables investigated. An analytical model is then developed to estimate the flexural strength (Mu) of prestressed concrete beams with external CFRP tendons. The proposed analytical model shows good agreement with FEA, i.e., the mean discrepancy for Δσp is 0.9% with a standard deviation of 11.1%; and the mean discrepancy for Mu is −1.6% with a standard deviation of 2.1%.

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“…Fiber reinforced polymer (FRP) has the advantages of non-corrosiveness and high strength, and is recognized as an alternative to steel bars [ 5 ]. These composite materials are widely employed for reinforcing or strengthening concrete structures [ 6 , 7 , 8 ]. However, FRP is linearly elastic until rupture without yielding, thereby raising concerns about the flexural ductility of RC elements with FRP bars [ 9 , 10 ].…”

Section: Introductionmentioning

confidence: 99%

Prediction of Structural Behavior of Continuous Reinforced Concrete Beams with Hybrid CFRP-Steel Bars

et al. 2022

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The present investigation aims to identify the flexural performance of two-span concrete beams reinforced with hybrid carbon fiber reinforced polymer (CFRP) and steel bars. By applying a finite element analysis, a comprehensive numerical assessment is performed. The investigated variables are Af/Ar (Af = area of CFRP bars; Ar = total area of CFRP/steel bars), load pattern (symmetrical and unsymmetrical loading) and load type (center-point, third-point and uniform loading). The results show that beams with Af/Ar of 0.25 show 16.0% and 11.3% higher ultimate load at symmetrical and unsymmetrical loading, respectively, than beams with Af/Ar of 0.0 (i.e., beams with steel bars), but the change in ultimate load is not apparent when varying Af/Ar between 0.25 and 1.0. Unsymmetrical loading causes 6.0–15.0% greater deflection capacities than the symmetrical one. When Af/Ar increases from 0.0 to 1.0, moment redistribution at symmetrical loading is decreased significantly by 62%, while the redistribution variation is marginal at unsymmetrical loading. In addition, the applicability of two equations based on the ultimate strain in tensile bars for predicting moment redistribution is evaluated. It is generally shown that these equations can account for the influence of Af/Ar and load type.

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Serviceability and Flexural Behavior of Concrete Beams Reinforced with Basalt Fiber-Reinforced Polymer (BFRP) Bars Exposed to Harsh Conditions

Cited by 19 publications

References 29 publications

A Comprehensive Review of the Effects of Different Simulated Environmental Conditions and Hybridization Processes on the Mechanical Behavior of Different FRP Bars

A Comprehensive Review of the Effects of Different Simulated Environmental Conditions and Hybridization Processes on the Mechanical Behavior of Different FRP Bars

Effect of Tendon-Related Variables on the Behavior of Externally CFRP Prestressed Concrete Beams

Prediction of Structural Behavior of Continuous Reinforced Concrete Beams with Hybrid CFRP-Steel Bars

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