Seismic behavior of RC columns strengthened with near-surface-mounted aluminum alloy bars and CFRP wraps

Wang, Haonan; Xing, Guohua; Zhao, Jiahua; Wen, Fayong

doi:10.1016/j.engstruct.2022.114742

Cited by 7 publications

(3 citation statements)

References 56 publications

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“…In (Wang et al 2022) the FE model was used to analyze and compare the strains and the value of lateral loads at characteristic points. In addition, the model was used to analyze concrete damage.…”

Section: Numerical Simulationmentioning

confidence: 99%

RC-Columns Subjected to Lateral Cyclic Force with Different FRCM-Strengthening Schemes: Experimental and Numerical Investigation

John,

Cascardi,

Verre

et al. 2023

Preprint

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The vulnerability of reinforced concrete (RC) structures against seismic events has prompted extensive research into retrofitting techniques aimed at enhancing their seismic performance. Among these, Fabric-Reinforced Cementitious Matrix (FRCM) systems have gained prominence as promising solutions for strengthening RC-columns. This study presents a comprehensive investigation into the seismic strengthening of RC columns using FRCM, combining experimental and numerical approaches to assess their effectiveness. The experimental phase of this research involved the fabrication of scaled RC-column specimens representing typical real-world conditions. These columns were subjected to a series of cyclic loading tests to simulate seismic forces. Multiple FRCM configurations, including different fiber types and dosages, were applied to these specimens. The experimental results revealed a substantial increase in the ductility, stiffness, and ultimate strength of the strengthened RC-columns, indicating the potential of FRCM systems as effective seismic retrofit solutions. In parallel, a numerical analysis was conducted using finite element modeling (FEM) to simulate the behavior of the strengthened RC-columns under seismic loading conditions. The FEM simulations were validated against the experimental data, demonstrating good agreement. This numerical investigation allowed for a more in-depth understanding of the stress distribution and deformation patterns within the strengthened columns, aiding in the optimization of FRCM reinforcement strategies. The integrated experimental and numerical investigation presented in this study contributes valuable insights into the seismic strengthening of RC-columns using FRCM systems. It provides a holistic understanding of their performance, including their enhanced load-carrying capacity, as well as improved ductility guiding the adoption of FRCM systems as a viable solution for mitigating seismic risk in existing RC-structures.

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Section: Numerical Simulationmentioning

confidence: 99%

RC-Columns Subjected to Lateral Cyclic Force with Different FRCM-Strengthening Schemes: Experimental and Numerical Investigation

John,

Cascardi,

Verre

et al. 2023

Preprint

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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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“…It has advantages such as lightweight, high tensile strength, and corrosion resistance. Consequently, it is being used for retrofit not only in columns [10][11][12][13] but also in beam-column joints [14][15][16], beams [17][18][19], and even bridge piers [20][21][22]. However, to achieve optimal performance in column retrofits, it is necessary to wrap all sides with fiber sheets.…”

Section: Introductionmentioning

confidence: 99%

Strengthening damaged columns on the soft first story of reinforced concrete building using ultra-high-strength fiber-reinforced concrete panels

Lim,

Tani,

Watanabe

et al. 2024

BNZSEE

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In this study, ultra-high-strength fiber-reinforced concrete (UFC) panels were used as a quick and effective measure for seismic strengthening of damaged reinforced concrete (RC) columns. Four 1/3-scale specimens, which replicated RC columns of the soft-first-story of a 10-story condominium building that was heavily damaged in the 2016 Kumamoto Earthquake, were constructed and tested. The specimens were strengthened using UFC panels after being preloaded to the drift ratio, at which the maximum load capacity of the target column was measured, and then subjected to the main loading until the ultimate state was reached. The UFC panels were installed on the two faces of the column in a direction parallel to the assumed loading direction. Two of the specimens had a UFC or RC wing wall attached to one side of the column, which was also aligned with the assumed loading direction. During the preloading and main loading, the specimens were subjected to a cyclic lateral load and varying axial load that simulated an earthquake load. The proposed method improved the maximum strength and ultimate drift ratio, and helped restore the initial stiffness of specimens with UFC panels and a wing wall to that of a column specimen during preloading. The test results of a previous study, wherein the target column, loading method, and strengthening method were the same but the specimens were not damaged before strengthening, were compared to study the impact of the damage on the RC column before strengthening.

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Seismic behavior of RC columns strengthened with near-surface-mounted aluminum alloy bars and CFRP wraps

Cited by 7 publications

References 56 publications

RC-Columns Subjected to Lateral Cyclic Force with Different FRCM-Strengthening Schemes: Experimental and Numerical Investigation

RC-Columns Subjected to Lateral Cyclic Force with Different FRCM-Strengthening Schemes: Experimental and Numerical Investigation

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

Strengthening damaged columns on the soft first story of reinforced concrete building using ultra-high-strength fiber-reinforced concrete panels

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