Strengthening of Reinforced Concrete Columns with Combined Ultra-High-Performance Fiber-Reinforced Concrete and Glass Fiber-Reinforced Polymer Jacketing

Dadvar, Sayyed Ali; Mostofinejad, Davood; Bahmani, Hadi

doi:10.14359/51732836

Cited by 3 publications

(3 citation statements)

References 27 publications

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“…The columns are the primary and critical components of a structure which damages to these elements can expose the whole structure to the danger of collapse [132][133][134][135][136]. Hence, strengthening and rehabilitation of RC columns by FRP composites are widely accomplished to improve the loading capacity and ductility of the columns [137][138][139][140][141][142]. When FRP composite is utilized for RC columns strengthening, it may buckle for compressive stresses induced in the FRP composite and, subsequently, debond from the concrete substrate.…”

Section: Strengthening Rc Columnsmentioning

confidence: 99%

RC members externally strengthened with FRP composites by grooving methods including EBROG and EBRIG: A state-of-the-art review

Sanginabadi

Yazdani

Mostofinejad

et al. 2022

Construction and Building Materials

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Section: Strengthening Rc Columnsmentioning

confidence: 99%

RC members externally strengthened with FRP composites by grooving methods including EBROG and EBRIG: A state-of-the-art review

Sanginabadi

Yazdani

Mostofinejad

et al. 2022

Construction and Building Materials

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“…The test results show that FRP jackets would increase the ductility, ultimate strength, and elongation of HSC columns by up to 300%, 198%, and 195%, respectively. However, due to the limitation of curing conditions of HSC or UHPC, it is difficult to produce the concrete confined by FRP tube, so the test model in the existing research was mainly to wind the FRP jackets on the cured concrete column (Dadvar et al, 2021;Liao et al, 2021Liao et al, , 2022Pour et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Axial compressive behavior of self-compacting micro-expansive high-strength concrete confined by glass fiber reinforced plastic tube

Wang

Ming-qiao

et al. 2023

Advances in Structural Engineering

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To solve the instability of the compression bars in the space truss composed of GFRP tubes, a composite column with high-strength concrete (HSC) confined by glass fiber-reinforced plastic (GFRP) tube was proposed. High-strength self-compacting micro-expansive concrete with a slump greater than 255 mm was produced under normal-temperature curing conditions and confined by GFRP tubes. A mechanical performance test of the GFRP-confined HSC short column under axial compression was performed. The effects of GFRP tube types, concrete expansion agent, constraint effect, ultimate load capacity, and failure mode of the composite structure were discussed and analyzed through the test. A model of the stress-strain response of the GFRP confined HSC column was proposed. The results show that the 45° fiber-wound GFRP tube has a significant restraining effect on the HSC. The stress-strain relationship increases quadratically in a linear fashion. When the composite column was damaged, the GFRP fiber was broken and the concrete was crushed. The ultimate strength was about 1.5 times that of unconstrained HSC columns, and the loading method has less influence on the results. The expansion agent has a significant effect on the deformation performance of the composite column, and its ultimate strain was about 1.4 times that of the composite column without expansion agent.

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“…[20][21][22] The requirement for upgrading and strengthening reinforced columns could be ascribed to increased external loading, faults in the construction, unintended damage to members, uncertainty on site, and residual stresses in the column steel rebars. [23][24][25] The strengthening and rehabilitation of concrete structures have attained significant attraction in the structural engineering domain. [26][27][28] Reinforced concrete members should be appropriately strengthened to satisfy the current design requirements and prevent wear and tear issues.…”

Section: Introductionmentioning

confidence: 99%

Rehabilitation of post‐heated rectangular reinforced concrete columns using different strengthening configuration

Abadel

2023

Structural Concrete

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It is common knowledge that increased temperatures have a negative impact on the axial load‐capacity and stiffness of reinforced concrete (RC) rectangular columns. This is something that is commonly acknowledged. For the purpose of restoring the axial capacity and stiffness of heat‐damaged RC columns, it is absolutely essential to carefully pick a suitable method for strengthening and repairing the columns. This research paper investigates the performance of various strengthening methods, such as the use of carbon fiber‐reinforced polymer (CFRP) jackets with near‐surface mounted (NSM) steel bars and a combination of welded wire mesh (WWM) and CFRP strengthening techniques, for the rehabilitation of RC rectangular columns that have been damaged due to exposure to high temperatures. Specifically, the paper focuses on the performance of these methods in relation to the rehabilitation of RC rectangular columns. There were three groups of tested RC rectangular columns: pre‐heated and unstrengthened, post‐heated and unstrengthened, and post‐heated and strengthened. Over a period of 3 h, 600°C was applied to the heated columns. Both a scheme utilizing a combination of unidirectional CFRP strips and NSM steel bars and another utilizing a combination of unidirectional CFRP strips and WWM were evaluated. Axial compression tests were performed on each column until failure occurred. The experimental test outcomes revealed that exposure to high elevated temperatures led to a decrease in the axial load‐carrying capacity of 38.6% and a decrease of 75.9% in initial stiffness, compared to unheated RC columns. Both strengthening schemes proved effective in restoring and surpassing the initial load‐carrying capacity of undamaged RC rectangular columns by an average of 35%. Notably, the combination of CFRP strips and WWM exhibited superior performance in restoring the initial stiffness of post‐heated RC rectangular columns, representing a novel finding. The strengthening scheme employing WWM and CFRP recovered 61.3% of the lost axial strength caused by high temperature, while the NSM/CFRP scheme restored 34.5% of the lost axial strength. In addition, the utilization of NSM in combination with CFRP strips as well as utilization of the WWM and CFRP systems leads to stiffness enhancement of 52.1% and 123.7%, respectively, when compared to post‐heated and unstrengthened RC columns. However, the study's findings have clearly shown that combination of WWM and CFRP strips is efficient in enhancing the strength of heated and unheated damage RC beams.

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Strengthening of Reinforced Concrete Columns with Combined Ultra-High-Performance Fiber-Reinforced Concrete and Glass Fiber-Reinforced Polymer Jacketing

Cited by 3 publications

References 27 publications

RC members externally strengthened with FRP composites by grooving methods including EBROG and EBRIG: A state-of-the-art review

RC members externally strengthened with FRP composites by grooving methods including EBROG and EBRIG: A state-of-the-art review

Axial compressive behavior of self-compacting micro-expansive high-strength concrete confined by glass fiber reinforced plastic tube

Rehabilitation of post‐heated rectangular reinforced concrete columns using different strengthening configuration

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