Ultimate Shear of RC Beams with Corroded Stirrups and Strengthened with FRP

Spinella, Nino; Colajanni, Piero; Recupero, Antonino; Tondolo, Francesco

doi:10.3390/buildings9020034

Cited by 13 publications

(10 citation statements)

References 35 publications

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“…The loss of strength of the prestressing system strongly influences the load‐bearing capacity of the beam . Therefore, it could be adequately taken into account in more refined models, also if they were originally proposed for not corroded structural elements …”

Section: Qualitative Interpretation Of the Experimental Resultsmentioning

confidence: 99%

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Experimental tests on corroded prestressed concrete beams subjected to transverse load

Recupero

Spinella

2019

Structural Concrete

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In prestressed concrete beams, the stress level of tendons drastically modifies the steel corrosion process. Stress corrosion is characterized by the coupling between the conventional corrosion and the steel microcracking. Also, for a low corrosion level of the tendon and under normal service loading, the steel microcracking can lead to a brittle failure. An example of PC structure failure is the Santo Stefano viaduct built in 1954, along the coast of the Mediterranean Sea, in Sicily (Italy). In this scenario, an experimental campaign on corroded prestressed concrete beams is carrying out at the University of Messina (Italy). The goal of the research project is the influence of tendon corrosion on the response behavior of structural elements subjected to transversal load. In 2006, a set of prestressed concrete beams was casted at University of Messina Laboratory. Some defects were artificially induced in each specimen by introducing chemical solution or acid in the duct. Then, different damaging fluids were used to induce a prestressed tendon weakness and the specimens were maintained in the basement of the laboratory. In the last year, a destructive test campaign has been started to investigated the degradation of the load‐bearing capacity of beams due to the corrosion progression. In this work, the experimental results of the first group of tests, in terms of crack pattern and load‐deflection response, are reported and commented.

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Section: Qualitative Interpretation Of the Experimental Resultsmentioning

confidence: 99%

“…However, experimental investigations regarding the response behavior of PC beams affected by corrosion are limited, if compared to the literature about corroded RC elements …”

Section: Introductionmentioning

confidence: 99%

Experimental tests on corroded prestressed concrete beams subjected to transverse load

Recupero

Spinella

2019

Structural Concrete

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“…e thickness of the wrapping is about 3 mm and 5 mm. Now the compressive strength of the columns is to be tested, and then the results are to be analyzed: if thickness of wrapping can attain the maximum strength [8]. e comparison is made between the wrapped column and the unwrapped column [21].…”

Section: Gfrp-wrapped Columnsmentioning

confidence: 99%

“…It successfully matched experimental data, showing that it can accurately predict the shear strength. Numerical analysis was also calculated to show the significance of the key factors in predicting ultimate shear strength [8].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on the Ecofriendly External Wrapping of Glass Fiber Reinforced Polymer in Concrete Columns

Vijayan

Mohan²,

Daniel

et al. 2021

Advances in Materials Science and Engineering

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An ecofriendly fiber reinforced polymer (FRP) had been used in the last decade to enhance the short concrete column’s strength and deformation capacity. This study involves the wrapping of FRP sheets with a thickness of 3 mm and 5 mm on a short column, and then the compressive strength is determined. The rectangular columns of size 150 mm × 300 mm are used for this study, and cast under the grades of M20 and M40 are wrapped with GFRP sheets at the thickness of 3 mm and 5 mm. These results are clarified at a specific thickness of the FRP-wrapped columns. It provides a maximum axial compressive strength, and Young’s modulus gets enhanced rigorously when it is to be compared to the normal concrete. This thesis deals with experimental studies of different parameters associated with wrapped glass fiber reinforced polymer (GFRP). In M20 grade, when the 3 mm wrapped specimen and the 5 mm wrapped specimen are compared, the specimen wrapped with 5 mm increases 5.182% more than the specimen wrapped with 3 mm. In M40 grade, when the 0 mm, 3 mm, and 5 mm wrapped specimens are compared, the specimen wrapped with 5 mm increases 2.47% more than the specimen wrapped with 0 mm. The 5 mm wrapping attains the maximum strength.

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“…Carbon fiber composite (CFRP) has the advantages of lightweight, high strength, corrosion resistance, and fatigue resistance. erefore, CFRP is widely used to strength and repair damaged bridges, while greatly reducing installation time and cost [14]. At present, the reinforcement of corroded prestressed concrete structures by CFRP has attracted much attention.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Flexural Behavior of Prestressed Concrete Beams Reinforced by CFRP under Chloride Environment

Liu

Fan

2019

Advances in Civil Engineering

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In order to study the effects of initial damages, CFRP reinforcement, and chloride corrosion on the flexural behavior of prestressed concrete beams, ten prestressed concrete beams were designed and manufactured, which were preloaded with 0%, 40%, and 60% of the ultimate load to crack. Then, part of the beams were reinforced by CFRP and immersed in chloride condition for 120 days. After that, the four-point bending tests were performed. Then, the sectional strain, deformation, flexural stiffness, flexural capacity, ductility, and the cracking characteristics were researched. The test results demonstrate that the sectional strain of PC beams still follows the plane cross section assumption after a pure bending deformation considering of the initial cracks, chloride corrosion, and CFRP reinforcement. The initial damage accelerates the chloride corrosion, resulting in the loss of initial stiffness, ductility, and cracking load, and the reduction in flexural capacity is less than 10%, and the failure modes of these beams are prone to change from concrete crushing to shear failure. In the cracking stage, the reinforcement of CFRP inhibits the bending deformation, leading to the reduction in stiffness degradation rates and the increase of cracking load, and the ultimate load increases by 12.8%∼18.7%. The reinforcement of CFRP constrains the development of cracks, increases the cracks numbers by 50%∼130%, decreases the cracking rates of beam bottoms by 52.5%, and reduces the average crack widths by 65.8% at 195 kN. It can be seen that the reinforcing effect of CFRP is more significant compared with the weakening effect of short-term chloride corrosion and initial damage on the flexural behavior.

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Ultimate Shear of RC Beams with Corroded Stirrups and Strengthened with FRP

Cited by 13 publications

References 35 publications

Experimental tests on corroded prestressed concrete beams subjected to transverse load

Experimental tests on corroded prestressed concrete beams subjected to transverse load

Experimental Investigation on the Ecofriendly External Wrapping of Glass Fiber Reinforced Polymer in Concrete Columns

Experimental Study on Flexural Behavior of Prestressed Concrete Beams Reinforced by CFRP under Chloride Environment

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