A new flexural strength model of CFRP-strengthened RC beams with intermediate crack induced debonding failure

Li, Guibing; Zhang, Aihui; Xiao, Yifei; Li, Huaying

doi:10.1016/j.compstruct.2023.116681

Cited by 6 publications

(3 citation statements)

References 30 publications

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“…where I g is the inertia moment of the gross concrete section shown in Equation (18). h is the depth of the rectangular section.…”

Section: Fatigue Limit Statementioning

confidence: 99%

“…Based on comparisons and the failure mode theory, they proposed a method to calculate the bending capacities of corroded RC beams strengthened with CFRP. The initial bonding failure was taken as the ultimate limit state of RC beams strengthened with CFRP [18]. A new method was developed to calculate the bending strength based on theoretical analyses and experimental results.…”

Section: Introductionmentioning

confidence: 99%

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Unified Flexural Resistance Design Method and Evaluation Frame for the B-Regions of RC Flexural Members—Theory and Application

et al. 2023

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The load and resistance factor design (LRFD) method is normally used to design B-regions of reinforced concrete (RC) flexural members. The design includes many checks corresponding to different limit states. The LRFD method requires many loop calculation steps in the design, demonstrating its relative inefficiency. It cannot be applied to compare limit states directly and quantitatively. Different design limit states are separated and isolated. How to improve the analytical calculation efficiency of the LRFD method and to realize direct and quantitative comparisons between limit states are very important problems in structural engineering. This paper presents an innovative unified flexural resistance design (UFRD) method and a unified flexural resistance evaluation (UFRE) frame to solve these problems to some extent. The main contents include the unified flexural resistance (UFR) principles, formulas for the unified flexural resistance design (UFRD) method, the operation procedure to facilitate its usage, the UFRE framework to compare limit states, and three examples. The results show that the UFRD method can provide the same design outcomes as the LRFD one. However, UFRD calculations are simpler, requiring at most 20% of the calculation steps of the LRFD method. The UFRE frame can make different limit states compare with each other directly and quantitatively, which cannot be realized by the LRFD method. It helps expose some potential and insufficient flexural resistance hazards for some limit states, such as the only 10% relative strength reservation of one example. Thus, the UFRD method and the UFRE frame supplement and develop the LRFD method to some degree. The simplicity and practicality of the approach and the frame make them appropriate for many applications.

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“…where I g is the inertia moment of the gross concrete section shown in Equation (18). h is the depth of the rectangular section.…”

Section: Fatigue Limit Statementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Unified Flexural Resistance Design Method and Evaluation Frame for the B-Regions of RC Flexural Members—Theory and Application

et al. 2023

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show abstract

“…Additionally, the relationship between the angle of the CFRP strips and the behavior of the RC beams was experimentally investigated by Norris et al [ 23 ], Chaallal et al [ 24 ], and Monti and Liotta [ 25 ]. In addition, the effect of CFRP on the flexural strength of RC structures was studied by Vrettos et al [ 26 ], Sun et al [ 27 ], Smith et al [ 28 ], and Li et al [ 29 ]. Furthermore, research on the anchors of CFRP-strengthened structures was performed by Zhou et al [ 30 ], Zhang and Smith [ 31 ], Sun et al [ 32 ], Mostafa and Razaqpur [ 33 ], Pudleiner et al [ 34 ], Li et al [ 35 ], and Tatar et al [ 36 ].…”

Section: Introductionmentioning

confidence: 99%

Performance of Reinforced Concrete Beams Strengthened by Bidirectional Carbon-Fiber-Reinforced Polymers Based on Numerical Models

Moon¹,

Kim

et al. 2023

Polymers

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The use of carbon-fiber-reinforced polymers (CFRPs) for the repair and rehabilitation of reinforced concrete (RC) structures has been receiving a lot of attention. Specifically, the shear strengthening of RC members based on CFRP materials has been treated as an effective and efficient strengthening method. Previous research projects focused on the shear strengthening of RC members with unidirectional CFRP strips. Although the effectiveness of a bidirectional CFRP layout compared to a unidirectional CFRP layout was discussed in several studies, these studies only investigated the issue based on experiments. Morever, the parameters of the bidirectional CFRP layout were not clearly defined. This study investigates the performance of RC beams strengthened by bidirectional CFRP based on numerical models. A numerical model based on finite element analysis is designed. Using the numerical model, the parameters of the horizontal CFRP strips, such as the layouts of horizontal CFRP strips and the number of horizontal CFRP strips, are studied. The results show that the effect of horizontal CFRP strips is maximized if the strips are distributed along the depth. In contrast, the number of horizontal CFRP strips does not significantly affect the shear strength of RC members.

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Automated Detection of Delamination Defects in Composite Laminates from Ultrasonic Images Based on Object Detection Networks

Cheng,

Qi,

et al. 2024

J Nondestruct Eval

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A new flexural strength model of CFRP-strengthened RC beams with intermediate crack induced debonding failure

Cited by 6 publications

References 30 publications

Unified Flexural Resistance Design Method and Evaluation Frame for the B-Regions of RC Flexural Members—Theory and Application

Unified Flexural Resistance Design Method and Evaluation Frame for the B-Regions of RC Flexural Members—Theory and Application

Performance of Reinforced Concrete Beams Strengthened by Bidirectional Carbon-Fiber-Reinforced Polymers Based on Numerical Models

Automated Detection of Delamination Defects in Composite Laminates from Ultrasonic Images Based on Object Detection Networks

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