Flexural Performance of Cracked Reinforced Concrete Beams Strengthened with Prestressed CFRP Sheets under Repeated Loads

Wang, Huijuan; Li, Changyong; Song, Sihao; Wang, Yao; Meng, Qingxin; Li, Fenglan

doi:10.3390/buildings13082115

Cited by 3 publications

(2 citation statements)

References 28 publications

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“…Fiber-reinforced polymer (FRP) is composed of fiber and resin matrix, which boasts high strength and superior corrosion resistance, as well as being a lightweight and convenient construction. This highlights that the FRP is rational to be widely applied for the reinforcing of concrete structures [4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 94%

“…Accompanied with the specimens for the bonding test, the cubic specimens were fabricated. The cube compressive strength of the concrete was measured using a group of cubic specimens with a dimension of 150 m. With the aim of applying the CFRP to reinforcing the existing curved beams or concrete pipes using prestressed technics [9,44], high-strength CFRP with a higher modulus of elasticity was selected in this study. The nominal thickness of the CFRP laminate was 0.167 mm.…”

Section: Materials Propertiesmentioning

confidence: 99%

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Experimental Study on Bond Behavior between CFRP and Concrete with a Convex-Circular Arc Interface

Qu,

Wei,

et al. 2023

Buildings

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The bond performance of CFRP to concrete plays a vital role in CFRP strengthening on concrete structures. In this paper, an experimental study was carried out to investigate the bond performance of CFRP to concrete with a convex-circular arc interface. The main factors were the curvature of the concrete surface and the bond length and the layers of the CFRP laminate. Based on the experimental results, the failure mode of the bond specimens, the variation of the bond capacity, the CFRP strain, and the bond–slip constitutive model are analyzed. The results showed that most of the specimens failed to peel off the interface concrete, and the bond capacity tended to increase with the increase in bond length when the bond length was within an effective value. When the interface curvature increased to 1/0.8 m, the bond capacity tended to increase due to the CFRP exerting a certain pressure on the concrete surface. The prediction formula of the bond capacity between the CFRP and concrete is proposed considering the influence of the interface curvature. The bond–slip curves are given out based on the finite differential analysis of the strain distribution of CFRP laminates. The accuracy and applicability of the proposed model are verified with a comparison to the test results and other existing models.

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Section: Introductionmentioning

confidence: 94%

Section: Materials Propertiesmentioning

confidence: 99%

Experimental Study on Bond Behavior between CFRP and Concrete with a Convex-Circular Arc Interface

Qu,

Wei,

et al. 2023

Buildings

Self Cite

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A Novel Approach to Monitoring the Performance of Carbon-Fiber-Reinforced Polymer Retrofitting in Reinforced Concrete Beam–Column Joints

Sapidis,

Naoum,

Papadopoulos

et al. 2024

Applied Sciences

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Due to insufficient transverse reinforcement, the retrofitting of beam–column joints (BCJs) in existing reinforced concrete (RC) frame structures is commonly required to alter their brittle behavior. The construction industry has extensively embraced carbon-fiber-reinforced polymers (C-FRPs) as near-surface-mounted (NSM) reinforcement. Monitoring the performance of C-FRP retrofitting is crucial due to the wide range of factors influencing its effectiveness. A novel methodology has been implemented to assess the efficacy of the C-FRP retrofitting method in this study. This approach was validated through experimental investigation of full-scale BCJs, which were retrofitted with C-FRP ropes and subjected to cyclic loading. Furthermore, piezoelectric lead zirconate titanate (PZT) patches were placed on the NSM C-FRP ropes, and the electro-mechanical impedance (EMI) method was employed to monitor the retrofitting technique’s performance. A combination of the commonly used statistical damage index root mean squared deviation (RMSD) and a hierarchical clustering-based approach (HCA) was used to assess the performance of the C-FRP retrofitting technique. The experimental investigation results strongly indicate the proposed approach’s positive impact on the reliable assessment of C-FRP retrofitting performance. Thus, the proposed approach enhances the safety and resilience of retrofitted BCJs in RC structures.

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Computational and Experimental Substantiation of Strengthening Reinforced Concrete Structures with Composite Materials of Power Plants under Seismic Action

Rubin,

Bellendir,

Antonov

et al. 2024

Buildings

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In Russia, a significant number of power facilities built in the 1960s and 1970s are located in regions where seismic effects were revised upward. This has led to an increase in the seismicity of the sites of facilities’ locations by magnitude 1–2 (MSK-64) in comparison with the data of design documentation. During the long-term operating period of power facilities, the load-bearing capacity of building structures, as a rule, decreases. This article presents the results of computational and experimental studies of reinforced concrete structures of thermal power plants and hydroelectric power plants for seismic effects in the range of magnitude 4–10 (MSK-64). The computational studies were carried out using ANSYS 16.0 software, and experimental studies were carried out on stands modeling seismic impacts with the help of hydraulic cylinders. The results of the studies showed that cracking of reinforced concrete structures without strengthening occurs at magnitude 6.0 (MSK-64) of seismic impact, and destruction occurs at magnitude 7.5. Thus, the seismic resistance of structures without reinforcement does not meet the requirements for seismic resistance, and strengthening is required. This study considers a variant of strengthening based on external composite reinforcement with CFRP. It is shown that the strengthening of structures with composite material increases their earthquake resistance up to magnitude 9–10 (MSK-64). This article presents recommendations on the CFRP strengthening of building structures of power facilities, both after receiving damage under seismic impact and in a planned manner to increase seismic resistance. The novelty of this work lies in the fact that quantitative results of increasing the seismic resistance of structures depending on the placement and number of layers of composite material are given.

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Flexural Performance of Cracked Reinforced Concrete Beams Strengthened with Prestressed CFRP Sheets under Repeated Loads

Cited by 3 publications

References 28 publications

Experimental Study on Bond Behavior between CFRP and Concrete with a Convex-Circular Arc Interface

Experimental Study on Bond Behavior between CFRP and Concrete with a Convex-Circular Arc Interface

A Novel Approach to Monitoring the Performance of Carbon-Fiber-Reinforced Polymer Retrofitting in Reinforced Concrete Beam–Column Joints

Computational and Experimental Substantiation of Strengthening Reinforced Concrete Structures with Composite Materials of Power Plants under Seismic Action

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