FRP Reinforcement to Retrofit Bridge Pier After Repair: Experimental Test Results

Xue, Junqing; Lavorato, Davide; Fiorentino, Gabriele; Bergami, Alessandro Vittorio; Briseghella, Bruno; Nuti, Camillo

doi:10.1007/978-3-030-88166-5_38

Cited by 2 publications

(2 citation statements)

References 29 publications

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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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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

View full text Add to dashboard Cite

show abstract

“…12,13 Most current research focuses on the perceptual knowledge that FRP can prevent or delay the buckling of longitudinal bars, but quantitative analysis of this FRP feature is rare. [14][15][16] In this regard, Nuti et al [17][18][19] replaced the severely damaged buckling reinforcement after the earthquake. They repaired the plastic hinge area of the bridge pier using ultra-high performance fiber reinforced concrete (UHPFRC) with steel fiber and carbon fiber reinforced polymer (CFRP).…”

Section: Introductionmentioning

confidence: 99%

Mechanical properties and constitutive model of the buckling restraint rebar under compression loads

Jia

Zhao

Bai

et al. 2023

Structural Concrete

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Buckling of the longitudinal rebar is one of the main forms of plastic hinge failure in reinforced concrete (RC) columns after an earthquake. This rebar buckling significantly impacts the seismic bearing capacity and energy dissipation capacity. To restrain the development of longitudinal rebar buckling behavior and delay the degradation of lateral strength in RC columns, this paper developed a new type of buckling restraint rebar (BRR) consisting of three components: longitudinal rebar, a restraint sleeve, and foam material. First, the BRR mechanical properties under compression and tension‐compression cyclic loading were obtained through quasi‐static loading tests. Then, the BRR compression and tension‐compression cyclic loading processes were numerically simulated based on ABAQUS finite element software. The simulated results were compared with the test results. Finally, a stress–strain constitutive model for this new BRR was proposed based on this study. Results showed that the restraint sleeve could significantly enhance the lateral stiffness and the bearing capacity of longitudinal reinforcement after yielding. The compressive performance of BRR was mainly affected by the length and wall thickness of the sleeve. The cyclic performance was mainly affected by the length of the sleeve and the clearance between the sleeve and the reinforcement. The BRR constitutive model proposed in this paper can accurately reflect the influence of restraint sleeves on the stiffness of longitudinal reinforcement after yielding.

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FRP Reinforcement to Retrofit Bridge Pier After Repair: Experimental Test Results

Cited by 2 publications

References 29 publications

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

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

Mechanical properties and constitutive model of the buckling restraint rebar under compression loads

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