Experimental and finite element studies on the flexural behavior of reinforced concrete elements strengthened with hybrid FRP technique

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

doi:10.1016/j.compstruct.2018.10.028

Cited by 55 publications

(22 citation statements)

References 44 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Several researchers compared the experimental and analytical flexural and shear capacities of different CFRP strengthened RC beams [21][22][23][24][25][26][27][28][29][30][31][32]37,38]. However, most of them [22,[26][27][28]37] found close analytical values when ACI 440.2R-08 [33] was used. In the current study, ACI 440.2R-08 [33] was adopted to analytically obtain the flexural and shear capacities of the beams.…”

Section: Analytical Prediction Of Beam Capacitiesmentioning

confidence: 99%

Cracking Behavior of RC Beams Strengthened with Different Amounts and Layouts of CFRP

et al. 2019

View full text Add to dashboard Cite

The bending and shear behavior of RC beams strengthened with Carbon Fiber-Reinforced Polymers (CFRP) is the primary objective of this paper, which is focused on the failure mechanisms and on the moment-curvature response prior-to, and post, strengthening with different amounts and layouts of the CFRP reinforcement. Seven reinforced concrete beams were tested in 4-point bending, one without any CFRP reinforcement (control beam, Specimen C1), four with the same amount of CFRP in flexure but with different layouts of the reinforcement for shear (Specimens B1–B4), and two with extra reinforcement in bending, with and without reinforcement in shear (Specimens B6 and B5, respectively). During each test, the load and the mid-span deflection were monitored, as well as the crack pattern. The experimental results indicate that: (a) increasing the CFRP reinforcement above certain levels does not necessarily increase the bearing capacity; (b) the structural performance can be optimized through an appropriate combination of CFRP flexural and shear reinforcement; and (c) bond properties at the concrete–CFRP interface play a vital role, as the failure is very often triggered by the debonding of the CFRP strips. The experimental values were also verified analytically and a close agreement between the analytical and experimental values was achieved.

show abstract

Section: Analytical Prediction Of Beam Capacitiesmentioning

confidence: 99%

Cracking Behavior of RC Beams Strengthened with Different Amounts and Layouts of CFRP

et al. 2019

View full text Add to dashboard Cite

show abstract

“…Although numerous studies in the past have focused on the strengthening of the RC (or plain concrete) members through FRP materials; only a handful of research work has focused on the strengthening of pre-damaged columns under axial compression [11][12][13][14]. 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].…”

Section: Research Motivationmentioning

confidence: 99%

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

View full text Add to dashboard Cite

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.

show abstract

“…In this approach, NSM CFRP laminates were first applied to act as external longitudinal reinforcement. After that, the column elements were wrapped with CFRP fabric to provide the required confinement . During hybrid strengthening of columns, no interference between the CFRP laminates and smoothened corners was observed.…”

Section: Experimental Investigationsmentioning

confidence: 99%

Experimental investigations on hybrid strengthening of short reinforced concrete column elements under eccentric compression

Chellapandian

Prakash

Sharma

2019

Structural Concrete

Self Cite

View full text Add to dashboard Cite

This work experimentally investigates the efficacy of hybrid strengthening technique using a combination of near‐surface mounted (NSM) carbon fiber laminates and externally bonded (EB) carbon fiber‐reinforced polymer (CFRP) wraps for short reinforced concrete (RC) columns under eccentric loads. The performance of the hybrid FRP strengthened column elements was compared with the members strengthened using only NSM CFRP laminates or only EB CFRP wraps. The behavior of columns without and with different types of strengthening under concentric and eccentric compression was also compared. The tests showed that the RC column elements upgraded using hybrid strengthening displayed significant improvement in both the stiffness and strength, especially under eccentric compression. The performance improvement was primarily due to the substantial contribution of NSM laminates to the bending resistance. Existing analytical models were used to validate the observed behavior. The analytical results obtained had a close match when compared to the experimental results.

show abstract

Experimental and finite element studies on the flexural behavior of reinforced concrete elements strengthened with hybrid FRP technique

Cited by 55 publications

References 44 publications

Cracking Behavior of RC Beams Strengthened with Different Amounts and Layouts of CFRP

Cracking Behavior of RC Beams Strengthened with Different Amounts and Layouts of CFRP

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

Experimental investigations on hybrid strengthening of short reinforced concrete column elements under eccentric compression

Contact Info

Product

Resources

About