Shear tests of GFRP-reinforced concrete beams strengthened in shear by textile reinforced concrete

Tran, Cao Thanh Ngoc; Nguyen, Xuan Huy; Le, Anh‐Tuan; Nguyen, Huy Cuong; Le, Dang Dung

doi:10.1016/j.istruc.2021.10.045

Cited by 11 publications

(5 citation statements)

References 22 publications

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“…The three-point bending test creates a stress concentration mainly at the loading point's center, whereas the four-point bending test generates a more uniformly distributed stress distribution. This latter approach provides advantageous circumstances for examining non-homogeneous materials like concrete, [9]. Choosing the four-point bending test for simulations improves precision and captures intricate deformation patterns more accurately compared to the three-point bending test.…”

Section: Introductionmentioning

confidence: 99%

Simulation of four-point bending tests for the viscoelastic fracture properties of concrete

Tran Nam,

Nguyen Thi Thu

2024

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Understanding the fracture properties of concrete, such as crack propagation behavior and fracture energy, is crucial for designing and evaluating concrete structures. Experimental results are insufficient and cannot be directly employed for a comprehensive analysis of the fracture behavior of concrete structures under load, particularly when considering concrete as viscoelastic with the presence of cracks. Recognizing the time and cost constraints of traditional experimental testing, this research leverages numerical simulations as a cost-effective alternative to determine viscoelastic material parameters. Thus, the critical evaluation of concrete fracture properties, fundamental for the design and assessment of concrete structures, is addressed. Employing a finite element method for four-point bending tests, the study systematically investigates parameters such as initial crack depth, displacement acceleration, and time step. The material properties of concrete are described using viscoelastic models. The findings provide valuable insights into crack propagation behavior and deformation characteristics, emphasizing the significant influence of the modulus of elasticity on both maximum load values and displacement. These findings contribute to a deeper understanding of the structure's response and underscore the importance of considering these parameters in similar simulations. The study highlights the importance of considering these parameters in simulations to enhance the understanding of concrete fracture behavior. The paper's contributions can extend to optimizing concrete mixtures, formulating repair strategies, and improving structural assessments. Further research is suggested to improve the accuracy of simulations and investigate material properties under various conditions.

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Section: Introductionmentioning

confidence: 99%

Simulation of four-point bending tests for the viscoelastic fracture properties of concrete

Tran Nam,

Nguyen Thi Thu

2024

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“…The fiber-reinforced polymer (FRP) reinforcement method is to attach FRP materials to the surface of concrete beams to inhibit the development of cracks on the surface of beams, so as to ensure the flexural capacity of the normal section of concrete beams. Research [16][17][18][19][20][21] used the combination of steel and glass-fiber reinforced polymer (GFRP) to improve the bending form of concrete beams. The strengthened beams showed obvious secondary stiffness, significantly improved stiffness and deformation capacity, and enhanced the ductility of reinforced concrete beams.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on flexural performance of reinforced concrete beams strengthened by PET

Liu

et al. 2023

Structural Concrete

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Polyethylene terephthalate (PET) is a new type of fiber‐reinforced polymer (FRP) composite material, which has the characteristics of high performance, high toughness, high tensile fracture load, low elongation, low creep, no rust, and safety in use. The good performance of PET can significantly improve the mechanical properties of its components. A total of six reinforced concrete (RC) beams were produced in the test, one of which was a comparison beam, and the other five were reinforced with PET. In the test, the PET reinforcement spacing, number of reinforcement layers, and laying method were used as control variables, and an experimental study on the normal section bending performance of the specimen was performed. The test analyses the failure characteristics, crack width, bearing capacity, and deflection of the specimens under different reinforcement conditions. The test results showed that PET reinforcement can effectively inhibit the occurrence and development of cracks in RC beams and improve the ultimate bearing capacity and ductility of the components. The smaller the PET reinforcement spacing, the higher the ultimate bearing capacity; the greater the number of PET layers, the better the ductility of the specimen. Additionally, the economy, environmental protection, and portability of PET are of great significance for its application in practical engineering reinforcement.

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“…Previous experiments were performed on reinforced concrete (RC) beams upgraded with FRP plates bonded to their outside surfaces 5–8 . Engineered cementitious composites (ECC), stainless steel plates (SSPs), textile‐reinforced concrete (TRC), and U‐wrapping TRC are other techniques to strengthen RC beams in shear 9–11 . Using ECC and SSPs as shear strengthening for the RC beams could enhance their shear capacity by 36%–97% 9 …”

Section: Introductionmentioning

confidence: 99%

“…[5][6][7][8] Engineered cementitious composites (ECC), stainless steel plates (SSPs), textilereinforced concrete (TRC), and U-wrapping TRC are other techniques to strengthen RC beams in shear. [9][10][11] Using ECC and SSPs as shear strengthening for the RC beams could enhance their shear capacity by 36%-97%. 9 The earlier research reported in References 5-10 concluded that EB-FRP enhanced the shear and flexural capacity of RC beams.…”

Section: Introductionmentioning

confidence: 99%

Shear performance of reinforced concrete beams strengthened in shear using NSM bars and reinforced HSC layers

Abdo

Sharaky

Ahmed

2023

Structural Concrete

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The reinforced concrete (RC) beams could be upgraded in shear using steel and fiber‐reinforced polymer (FRP) having several shapes (bars, strips, or sheets). Using near‐surface mounted (NSM) Glass FRP (GFRP) bars is still limited compared to carbon FRP (CFRP) elements as shear reinforcement. Moreover, using reinforced high‐strength concrete layers (HSCL) as NSM shear strengthening for the RC beams is still limited. Herein, three RC beams internally reinforced in shear using different shear areas (without, 100 mm stirrups apart, and 200 mm stirrups apart) were experimentally tested as reference beams (CB). Other eight beams strengthened in shear using NSM HSCL, and bars were experimentally tested. Moreover, an extended finite element (FE) simulation was implemented through a verified FE model to study the effect of other NSM aspects on shear‐strengthened beam response. The results explained that, regardless of the internal stirrups area and external NSM characteristics, the shear‐strengthened beams showed higher load efficiency than the corresponding CB. The NSM upgraded shear beam had slightly higher load efficiency than the un‐strengthened beam having the same steel area as internally shear stirrups. Moreover, increasing the internal shear stirrups decreased the total efficiency of the NSM shear strengthening and the internal stirrups regardless of the NSM characteristics. Furthermore, the NSM HSCL was more efficient than the corresponding NSM bars in increasing the load capacity and stiffness of the shear‐strengthened beams. The reported analytical model predicted well the shear capacity of the tested beams.

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Shear tests of GFRP-reinforced concrete beams strengthened in shear by textile reinforced concrete

Cited by 11 publications

References 22 publications

Simulation of four-point bending tests for the viscoelastic fracture properties of concrete

Simulation of four-point bending tests for the viscoelastic fracture properties of concrete

Experimental study on flexural performance of reinforced concrete beams strengthened by PET

Shear performance of reinforced concrete beams strengthened in shear using NSM bars and reinforced HSC layers

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