Study on axial compressive properties of RC square columns strengthened with prestressed CFRP sheets

Lu, Chun‐Ling; Xiao, Yi-Peng; Wang, Qiang; Zhu, Wanxu

doi:10.1016/j.istruc.2020.07.033

Cited by 15 publications

(10 citation statements)

References 14 publications

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“…While these methods led to varying degrees of improvement in the seismic performance of the RC columns, they also presented challenges such as complex construction processes and high costs. Fiber-reinforced polymer (FRP) has gained widespread attention and application in practical engineering due to its advantages such as ease of installation, lightweight, high strength, excellent corrosion resistance, and superior fatigue resistance [13][14][15][16][17][18]. Ma et al [19] employed polyethylene terephthalate (PET) FRP to reinforce RC columns, and the results showed that the columns reinforced with PET FRP exhibited less severe damage, narrower cracks, and smaller crack angles under high axial loading.…”

Section: Introductionmentioning

confidence: 99%

Seismic Performance Analysis of Concrete Columns Reinforced with Prestressed Wire Ropes Embedded in Polyurethane Cement Composites

Guo,

Zhang,

Chen

et al. 2024

Buildings

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In order to improve the seismic performance of reinforced concrete (RC) columns, a reinforcement technology using prestressed steel wire ropes embedded in polyurethane cement composite material is proposed. Four concrete columns reinforced with different materials were subjected to a combination of axial compression and horizontally repeated loading tests (one of which was not reinforced, while the remaining three were reinforced with prestressed steel wire rope, polyurethane cement composite material, and prestressed steel wire ropes embedded in polyurethane cement composite material). The experimental results show that the ductility and energy dissipation capacity of reinforced concrete columns after reinforcement are significantly improved. After strengthening with prestressed steel wire ropes embedded in polyurethane cement composite material, the ultimate horizontal displacement and energy dissipation capacity of reinforced concrete columns were significantly improved, which were 69% and 3.2 times higher than those of unreinforced columns, respectively.

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Section: Introductionmentioning

confidence: 99%

Seismic Performance Analysis of Concrete Columns Reinforced with Prestressed Wire Ropes Embedded in Polyurethane Cement Composites

Guo,

Zhang,

Chen

et al. 2024

Buildings

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“…[15][16][17] Moreover, FRPs possess superior properties and advantages such as (i) lightweight, (ii) corrosion resistance, and (iii) high strength-to-density ratio than conventional strengthening materials. [18][19][20][21] The external bonding (EB) of FRP significantly improves the strength and ductility of the RC elements under compression loading by enhancing the confinement of concrete. [22][23][24] However, the efficiency of the EB strengthening in improving the strength reduces drastically under flexural loading.…”

Section: Introductionmentioning

confidence: 99%

Cracking and failure mode behavior of hybrid FRP strengthened RC column members under flexural loading

Balla,

Prakash

2024

Structural Concrete

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Strengthening of reinforced concrete (RC) members in bridges and buildings is often required to improve flexural performance. Strengthening using fiber‐reinforced polymer (FRP) composites has become popular as FRPs offer multiple advantages compared with conventional strengthening practices like steel jacketing and concrete enlargement. External bonding (EB) using carbon FRP (CFRP) laminates/fabric has become a common strengthening practice. The effectiveness of the EB strengthened system is reduced due to possible debonding of FRP from concrete substrate. The near‐surface mounting (NSM) of FRP laminates is efficient in reducing the debonding failure, but it is not effective under dominant compression loading. Hybrid FRP (HYB) strengthening combines the advantages of both the NSM and EB techniques. HYB strengthening can enhance the performance of RC members under all loading combinations. The main objective of this study is to understand the flexural crack opening behavior of control and hybrid FRP strengthened RC column members under pure bending. The digital image correlation (DIC) analysis shows that the crack width and its propagation are significantly reduced due to hybrid FRP strengthening. The crack widths measured using the DIC are compared with the analytical predictions based on Eurocode 2 and fib bulletin 90. HYB FRP strengthening increased the strength and post‐cracking stiffness of RC elements under flexure without compromising the ductility. In addition, the HYB strengthening distributed the damage under flexural loading, unlike localized damage observed in control RC elements.

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“…Hence, CFRP is regarded as one of the most suitable materials for prestress tensioning and is more suitable for strengthening large‐size and complex cross‐section specimens 26,27 . Studies demonstrated that active confinement of prestressed CFRP can significantly improve the axial bearing capacity and ductility performance of RC columns during axial compression 28–31 . Zhou et al 32,33 conducted experimental tests on the seismic performance of RC columns with prestressed CFRP transverse active confinement.…”

Section: Introductionmentioning

confidence: 99%

“…26,27 Studies demonstrated that active confinement of prestressed CFRP can significantly improve the axial bearing capacity and ductility performance of RC columns during axial compression. [28][29][30][31] Zhou et al 32,33 conducted experimental tests on the seismic performance of RC columns with prestressed CFRP transverse active confinement. The results indicated that active confinement could effectively prevent shear failure.…”

Section: Introductionmentioning

confidence: 99%

Seismic behavior of RC columns under high active confinement force

Wang,

Qin,

Gong

et al. 2023

Structural Concrete

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This paper details the invention of a tensioning and anchoring device based on the “wedge‐cutting effect” that can tension and anchor multi‐layer carbon fiber reinforced polymer (CFRP) fabric. To achieve a high active confinement effect on an RC column, the device is characterized by its capability to lift the applied prestress to the greatest extent and minimize prestress loss. All eight RC columns with identical structural dimensions were designed and fabricated, including three unstrengthened and five strengthened columns. The seismic performance test and finite element simulation were conducted under a low cyclic reciprocating load. The test parameters include active confinement force and axial compression ratio, with active confinement force varying as a function of the number of layers of CFRP fabric. The results indicate that the seismic performance of RC columns with high active confinement can be significantly improved. Under a high axial compression ratio, the maximum displacement ductility coefficient and ultimate drift ratio of specimens strengthened with four layers of prestressed CFRP fabrics can increase by 87% and 152%, respectively, while the energy consumption can increase by 4.3 times. Additionally, the ultimate horizontal bearing capacity can be raised by 41%. The seismic performance of strengthened columns increases with the increase of active confinement, particularly under high axial compression. The finite element model is in good accord with the experiment. With an increase in active confinement force, the properties of confined concrete and CFRP are utilized to a greater extent, and more energy is dissipated by the opening and closing of numerous micro cracks.

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Study on axial compressive properties of RC square columns strengthened with prestressed CFRP sheets

Cited by 15 publications

References 14 publications

Seismic Performance Analysis of Concrete Columns Reinforced with Prestressed Wire Ropes Embedded in Polyurethane Cement Composites

Seismic Performance Analysis of Concrete Columns Reinforced with Prestressed Wire Ropes Embedded in Polyurethane Cement Composites

Cracking and failure mode behavior of hybrid FRP strengthened RC column members under flexural loading

Seismic behavior of RC columns under high active confinement force

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