Structural strengthening of concrete beams using prestressed plates

Garden, H N; Mays, Geoff

doi:10.1533/9781855737617.135

Cited by 9 publications

(3 citation statements)

References 3 publications

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“…To repair damaged full-size bridges, non-prestressed and prestressed CFRP strengthening methods are used. Gardern [12] reinforced two 18.0 m long damaged beams from a failing bridge using 30% of the ultimate strength of prestressed CFRP. The load-carrying capacity of the strengthened beams increased by up to 60%.…”

Section: Introductionmentioning

confidence: 99%

Flexural Behavior of Damaged Hollow RC Box Girders Repaired with Prestressed CFRP

et al. 2023

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In recent years, numerous studies have explored the benefits of utilizing prestressed carbon fiber-reinforced polymer (CFRP) for strengthening concrete structures. However, research on the reinforcement of prestressed CFRP on full-scale hollow RC box girders, particularly damaged bridges, remains limited. In this study, both experiments and finite element analysis (FEA) were performed to investigate the flexural behavior of full-scale hollow RC box girders with varying degrees of damage, which were strengthened using CFRP with different levels of prestress. The adhesive behavior of the CFRP–concrete interface was considered in the FEA. Numerical simulations were conducted to assess the flexural behaviors of the girders, including failure modes, yield and ultimate loads, and deflections. The results revealed that the application of prestressed CFRP efficiently increased the yield and ultimate loads of the box girders. Specifically, when the degree of damage of the hollow box girder was less than 23%, the flexural bearing capacity of the repaired girder could be recovered after being strengthened with two prestressed CFRP strips measuring 50 mm in width and 3 mm in thickness. However, the risk of premature debonding at the CFRP–concrete interface increased when the prestressing level of CFRP and degree of damage of hollow RC box girders exceeded 35% and 40%, respectively. These findings suggest that the use of prestressed CFRP may be a promising method for repairing damaged hollow RC box girders, but careful consideration of the degree of damage and prestressing level would be necessary to ensure the effectiveness and safety of the repair.

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Section: Introductionmentioning

confidence: 99%

Flexural Behavior of Damaged Hollow RC Box Girders Repaired with Prestressed CFRP

et al. 2023

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“…The field or full-scale applications of prestressed CFRP for strengthening are very limited. Gardern [ 17 ] utilized two damaged beams with 18.0 m length from a deteriorated bridge and strengthened them by prestressed CFRP with 30% of ultimate strength. Compared to the unreinforced beams, the load-carrying capacity of strengthened beam was up to 60%.…”

Section: Introductionmentioning

confidence: 99%

Flexural Behavior of Full-Scale Damaged Hollow RC Beams Strengthened with Prestressed SCFRP Plate under Four-Point Bending

Zeng

Guo

et al. 2022

Polymers

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The advantages of using prestressed carbon fiber reinforced polymer (CFRP) for strengthening and retrofitting structures have been reported in recent years. In this regard, most of the studies on prestressed CFRP technique have been carried out in the laboratory test with small-scale and no damage (reinforced concrete) RC beam. However, the real structures that need to be retrofitted in service are often degraded or damaged due to early cracking. This paper aims at studying the effect of prestressed CFRP method on full-scale and damaged RC beams. The damaged levels of four full-scale damaged hollow RC beams taken from an old bridge were evaluated. One damaged beam was tested to check the residual capacity, and the other three were strengthened with prestressed composite strengthened CFRP and steel-carbon fiber reinforced polymer (SCFRP). The flexural behavior of non-strengthened and prestressed strengthened beams was investigated. During the experiments, the failure modes, deflection, yield and ultimate load, strains of concrete, steel reinforcements, and SCFRP were measured and analyzed. The results showed that the stiffness at the elastic stage was increased by 64.9%, 66.9%, and 67.1% after strengthened by SCFRP with 30%, 40%, and 60% prestressing level. Moreover, the ultimate load of damaged hollow RC beams were improved by 19.53%, 21.82%, and 31.9%, respectively. The flexural behavior of the severely damaged RC beam with strength reduction coefficient of 0.65 can be recovered after being strengthened by SCFRP with 40% prestressing levels. Meanwhile, SCFRP-concrete interface debonding failure occurred when the prestressing level exceed 60%, and the characteristics of brittle failure became more evident with increased prestressing level of the SCFRP.

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“…Only 20~30 percent of the tensile strength of CFRP can be employed before the reinforcing steel bars of the CFRP-strengthened structures yield [1]. The drawback can be solved by the technique of prestressing FRP, and thus a great deal of research has been conducted to investigate the load-carrying behavior of prestressed CFRP-strengthened structures [2][3][4][5][6][7][8][9]. The RC structures in need of strengthening are often damaged and cracked due to loading.…”

Section: Introductionmentioning

confidence: 99%

Behavior of Pre-Cracked Reinforced Concrete Beam Strengthened with Prestressed CFRP Plate

Wang

Peng

Zhang

2013

AMM

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The technique of strengthening structures with prestressing CFRP can improve the load-carrying behavior of reinforced concrete structures and has gained more and more attention recent years. However the research about behavior of the pre-cracked structures after retrofit is rather limited. In this paper two RC beams with large dimension were constructed. One beam was strengthened by non-prestressed CFRP plate serving as reference beam. And the other beam had been loaded to its yielding load before it was strengthened with a prestressed CFRP plate. The monotonic tests were conducted to investigate the effect of strengthening with prestressed CFRP on the behavior of the pre-damaged beam. Based on the experiment results, the comparison of behavior between the beam with non-prestressed CFRP plate and the pre-cracked beam with prestressed CFRP was conducted. The experiment results indicated that although having been loaded to its steel yielding before being strengthened, the specimen with prestressed CFRP plate had a load-carrying capacity no less than the intact beam with non-prestressed CFRP plate. Despite the serious damages of section, the stiffness of the pre-cracked specimen was almost equal to that of the reference specimen, which indicates that the technique of strengthening structures with prestressed CFRP plates can be effective in the retrofit of the seriously cracked reinforced concrete structures.

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Structural strengthening of concrete beams using prestressed plates

Cited by 9 publications

References 3 publications

Flexural Behavior of Damaged Hollow RC Box Girders Repaired with Prestressed CFRP

Flexural Behavior of Damaged Hollow RC Box Girders Repaired with Prestressed CFRP

Flexural Behavior of Full-Scale Damaged Hollow RC Beams Strengthened with Prestressed SCFRP Plate under Four-Point Bending

Behavior of Pre-Cracked Reinforced Concrete Beam Strengthened with Prestressed CFRP Plate

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