Experimental and Numerical Studies on Effectiveness of Hybrid FRP Strengthening on Behavior of RC Columns under High Eccentric Compression

Chellapandian, M.; Prakash, Shamsher; Mahadik, Vinay; Sharma, Akanshu

doi:10.1061/(asce)be.1943-5592.0001420

Cited by 19 publications

(6 citation statements)

References 44 publications

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“…Moreover, FRP strengthening and rehabilitation of concrete members with non-circular sections is still a challenging issue for researchers because of the reduced efficiency of confinement (EB) through FRP wrapping [15][16][17]. Additionally, EB strengthening alone cannot improve the performance of columns under flexure-dominated loading [4][5][6]. This work investigates the behaviour of hybrid strengthening using a combination of NSM CFRP strips confined by carbon FRP fabrics for improving the performance of pre-damaged columns under compression.…”

Section: Research Motivationmentioning

confidence: 99%

“…First, the columns are strengthened using the NSM technique followed by external CFRP confinement. The complete details of performing hybrid strengthening were already documented elsewhere [4][5][6]21,22] and are not repeated for brevity. A schematic illustration of a hybrid FRP technique is shown in Figure 4.…”

Section: Hybrid Frp Strengtheningmentioning

confidence: 99%

“…Externally bonded (EB) strengthening is highly efficient in improving the strength and ductility of columns under axial compression [1][2][3]. However, the confinement effect reduces with increase in aspect ratio for non-circular specimens (cross-section changes from circular to rectangular) [4][5][6]. The effect of confinement reduces for a high strength concrete column due to reduced lateral dilation when compared to normal strength concrete columns.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Cyclic Damage on the Performance of RC Square Columns Strengthened Using Hybrid FRP Composites under Axial Compression

Chellapandian

Jain

Prakash

et al. 2019

Fibers

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The effectiveness of hybrid fibre-reinforced polymer (FRP) strengthening is evaluated for rapid repair of the pre-damaged plain concrete (PC) and reinforced concrete (RC) columns. The objective of this study is to understand the efficiency of hybrid technique for completely restoring the initial stiffness, load carrying capacity and ductility of pre-damaged columns under cyclic compression loads. Two series of PC and RC square columns were cast. The columns were pre-damaged by loading up to 80% of peak load capacity for three cycles under pure compression. After cyclic damage, the columns were strengthened with two techniques, namely (a) near-surface mounted (NSM) carbon FRP (CFRP) laminates and (b) hybrid FRP technique, which uses a combination of NSM and externally bonded (EB) CFRP fabric. Analytical modelling was carried out for predicting the behaviour of columns with initial cyclic pre-damage. Additionally, a phased three-dimensional nonlinear finite element (FE) analysis was performed to validate the behaviour of pre-damaged columns with different strengthening techniques. Test results show that cyclic pre-loading and resulting damage causes a reduction in axial stiffness of all damaged specimens. Hybrid strengthening completely restored the stiffness and strength under compression. Prediction of analytical and FE analysis correlated well with the tests.

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Section: Research Motivationmentioning

confidence: 99%

Section: Hybrid Frp Strengtheningmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of Cyclic Damage on the Performance of RC Square Columns Strengthened Using Hybrid FRP Composites under Axial Compression

Chellapandian

Jain

Prakash

et al. 2019

Fibers

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“…The FRCM method provided good results for the retrofitting of RC elements to obtain sufficient ultimate capacity, ductility, and stiffness. Although the FRCM method exhibits good results in strengthening/retrofitting, the effect on the ultimate capacity and ductility decreases when the number of FRCM layers increases [16][17][18][19][31][32][33][34][35][36]. The failure of the FRCM is caused by the slippage of the fibre inside the cementitious matrices rather than by fibre rupture.…”

Section: Introductionmentioning

confidence: 99%

Failure analysis of hybrid strengthened RC square column

2024

JCE

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This paper presents an analytical and experimental examination of reinforced concrete (RC) columns strengthened with a combined system of fibre-reinforced cementitious material (FRCM) and externally bonded fibre-reinforced plastics (EB-FRP). The proposed technique makes use of these advantages in enhancing the strength and minimising the premature failure of RC columns. Seven square RC columns were cast: one control column, four FRCM-strengthened columns, and two hybrid-strengthened columns. Two fibres, namely, carbon and glass fibres, were used. The columns were tested under an axial compression load in a loading frame. The ultimate strength, load vs. deformation, failure, and ductility were discussed to examine the failure and strengthening behaviour. The proposed method provided a higher confinement effect and increased capacity with fewer FRCM with EB-FRP than the other methods. Analytical predictions of the peak load were made and correlated with the experimental results.

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“…By using inorganic materials to strengthen the main beam, the stiffness and strength of the beam are changed to effectively stop the structure from cracking. Organic reinforcement methods mainly include composite reinforcement (FRP) [20], polymer filling, and polymer-modified materials [21]. The use of organic materials for reinforcement and strengthening treatment of concrete structures not only improves the load-bearing capacity of bridges but also has the advantages of corrosion resistance and high toughness.…”

Section: Introductionmentioning

confidence: 99%

Static Load Test Analysis of T-Beam Bridge Shear Strengthening by Prestressed Steel Wire Rope Embedded in Polyurethane Cement (PSWR-PUC)

Liu

Jian

et al. 2023

Sustainability

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Many bridges suffer from aging and deterioration problems and need to be strengthened. PSWR-PUC is an emerging structural strengthening technology that enhances the load-bearing capacity of concrete bridges by embedding prestressed steel wire ropes into polyurethane cement. This paper focuses on investigating the shear reinforcement effectiveness of PSWR-PUC. Firstly, the composition of PSWR-PUC is introduced. Subsequently, two T-beam bridges in similar service condition are selected, and shear strengthening schemes involving PSWR-PUC and externally bonded steel plates are devised. Lastly, static loading tests are conducted, and the deflection and strain data of the two bridges before and after reinforcement intervention are analyzed. The results indicate that both strengthening methods improve the bridge load-carrying capacity. However, compared to the bridge strengthened with the externally bonded steel plate method, the deflections in the bridge strengthened with PSWR-PUC decreased by 36.8% and 42.1%, the strains decreased by 18% and 23%, and the shear stiffness was improved to a greater extent. These results verified that the PSWR-PUC strengthening method is effective for improving structural capacity and performance. This study will contribute to an in-depth understanding of the performance characteristics and application scope of PSWR-PUC shear strengthening technology, and it provides a scientific basis and guidance for practical engineering applications.

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Experimental and Numerical Studies on Effectiveness of Hybrid FRP Strengthening on Behavior of RC Columns under High Eccentric Compression

Cited by 19 publications

References 44 publications

Effect of Cyclic Damage on the Performance of RC Square Columns Strengthened Using Hybrid FRP Composites under Axial Compression

Effect of Cyclic Damage on the Performance of RC Square Columns Strengthened Using Hybrid FRP Composites under Axial Compression

Failure analysis of hybrid strengthened RC square column

Static Load Test Analysis of T-Beam Bridge Shear Strengthening by Prestressed Steel Wire Rope Embedded in Polyurethane Cement (PSWR-PUC)

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