Experimental and numerical study of strengthening non-ductile RC columns with and without lap splice by Carbon Fiber Reinforced Polymer (CFRP) jacketing

Juntanalikit, Pragasit; Jirawattanasomkul, Tidarut; Pimanmas, Amorn

doi:10.1016/j.engstruct.2016.07.019

Cited by 42 publications

(14 citation statements)

References 9 publications

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“…Juntanalikit et al [43] reported that after CFRP jacketing, lap-splice deficient specimens do not experience gravity load collapse, as the core, which mainly bears the gravity load, is effectively confined against concrete crushing and spalling by the CFRP jackets. In a recent study by Paultre et al [42], it was found that the enhancement in energy dissipation with CFRP strengthening is more pronounced for specimens with a relatively higher amount of transverse reinforcement and lower axial load ratio.…”

Section: Cfrp Strengtheningmentioning

confidence: 99%

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Strengthening and Repair of Reinforced Concrete Columns by Jacketing: State-of-the-Art Review

et al. 2019

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Sustainability necessitates the protection of infrastructure from any kind of deterioration over the life cycle of the asset. Deterioration in the capacity of reinforced concrete (RC) infrastructure (e.g., bridges, buildings, etc.) may result from localised damage sustained during extreme loading scenarios, such as earthquakes, hurricanes or tsunamis. In addition, factors such as the corrosion of rebars or ageing may also deteriorate or degrade the capacity of an RC column, thereby necessitating immediate strengthening to either extend or ensure its design life is not limited. The aim of this paper is to provide a state-of-the-art review of various strengthening and repair methods for RC columns proposed by different researchers in the last two decades. The scope of this review paper is limited to jacketing techniques for strengthening and/or repairing both normal- and high-strength RC columns. The paper also identifies potential research gaps and outlines the future direction of research into the strengthening and repair of RC columns.

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Section: Cfrp Strengtheningmentioning

confidence: 99%

Section: Cfrp Strengtheningmentioning

confidence: 99%

Strengthening and Repair of Reinforced Concrete Columns by Jacketing: State-of-the-Art Review

et al. 2019

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“…Raza et al [1] presented a state-of-the-art review of six types of strengthening and repair methods for RC columns: RC/mortar jacketing, steel jacketing, externally bonded FRP jacketing, near-surface-mounted FRP jacketing, shape memory alloy jacketing, and hybrid jacketing. The externally bonded FRP strengthening technique has been reported to be the most popular method.…”

Section: Introductionmentioning

confidence: 99%

Shear Strength of Reinforced Concrete Columns Retrofitted by Glass Fiber Reinforced Polyurea

2020

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Aged structures and structures constructed based on outdated non-seismic design codes should be retrofitted to enhance their strength, ductility, and durability. This study evaluates the structural performance of reinforced concrete (RC) columns enhanced via polyurea or glass fiber reinforced polyurea (GFRPU) strengthening. Four RC column specimens, including a reference specimen (an unstrengthened column), were tested to evaluate the parameters of the strengthening materials and the strengthened area. The tests were carried out under a combined constant axial compressive load and quasi-static cyclic loading. The experimental results show that the composite strengthening provides lateral confinement to the columns and leads to enhanced ductility, shear-resistance capacity, and dissipated energy. The shear strength provided by the composites depends on the degree of lateral confinement achieved by the composite coating. The specimens finally failed through the development of diagonal tension cracks within the potential plastic hinge regions. The specimen treated with GFRPU strengthening showed greater strength and dissipated more energy than the specimen treated with polyurea strengthening. Furthermore, by modifying ATC-40, this study proposed an equation to estimate the shear capacity provided by the composites.

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“…Moreover, it prevents brittle shear failure and allows formation of a plastic hinge mechanism [13]. Furthermore, the FRP external wrapping of RC columns can decrease crack width, which limits the apparition of the damage [14], as well as, it can delay the longitudinal reinforcement buckling and accordingly prevent the crushing of concrete cover [15,16]. Besides, from the literature, using CFRP anchor dowels with CFRP external wrapping in strengthening RC columns increases the ultimate drift ratio by more than two times of RC columns with no strengthening [17].…”

Section: Introductionmentioning

confidence: 99%

A Numerical Study on Seismic Performance Evaluation of Rc Rectangular Columns Strengthened With CFRP Sheets

Youssef¹,

Ahmed

et al. 2020

JES. Journal of Engineering Sciences

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External confinement of reinforced concrete columns using fiber-reinforced polymer (FRP) sheets can significantly enhance their seismic behavior. This research presents a numerical investigation to evaluate the seismic performance of RC rectangular columns with limited cross-sections' aspect ratios (1, 1.5, and 2) strengthened with a fully wrapped CFRP jacket under constant axial and pushover lateral loads. Therefore, a three-dimensional finite element model was implemented via ABAQUS software, which has been adopted in this study, where the proposed model showed a reliable agreement with the previous experimental work. The studied parameters are longitudinal steel reinforcement ratio, CFRP confinement ratio, and axial load/capacity ratio for each cross-section aspect ratio. The obtained numerical results have proved that the external wrapping of RC rectangular columns with CFRP sheets has effectively increased drift capacity ratios for cross-sections aspect ratios 1, 1.5, and 2. Moreover, the strengthening of RC rectangular columns using external CFRP wrapping increases the nominal shear and flexural strengths of the strengthened columns. Also, the effect of increasing the longitudinal steel reinforcement ratio can significantly decrease the ultimate lateral displacement and drift capacity ratios. Besides, with the increase of the axial load/capacity ratios, the

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Experimental and numerical study of strengthening non-ductile RC columns with and without lap splice by Carbon Fiber Reinforced Polymer (CFRP) jacketing

Cited by 42 publications

References 9 publications

Strengthening and Repair of Reinforced Concrete Columns by Jacketing: State-of-the-Art Review

Strengthening and Repair of Reinforced Concrete Columns by Jacketing: State-of-the-Art Review

Shear Strength of Reinforced Concrete Columns Retrofitted by Glass Fiber Reinforced Polyurea

A Numerical Study on Seismic Performance Evaluation of Rc Rectangular Columns Strengthened With CFRP Sheets

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