An effective improvement for enhancing the strength and feasibility of FRP spike anchors

Sun, Wei; Liu, Shukui; Zhang, Chunyang

doi:10.1016/j.compstruct.2020.112449

Cited by 13 publications

(3 citation statements)

References 27 publications

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“…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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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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“…Another anchorage system that was proven effective in attaining the full capacity of the FRP is FRP spike anchors. FRP spike anchors are made of a bundle of fibers soaked in epoxy resin, with one end of the fibers inserted into the concrete and the other end splayed in a fan shape over the FRP plate [ 31 , 32 , 33 ]. The main advantage of FRP spike anchors, as opposed to other anchorage systems, is their applicability to a wide range of structural applications and their compatibility with the FRP sheets [ 34 , 35 , 36 ].…”

Section: Introductionmentioning

confidence: 99%

CFRP U-Wraps and Spike Anchors for Enhancing the Flexural Performance of CFRP-Plated RC Beams

et al. 2023

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Deterioration of infrastructure is a major challenge in the civil engineering industry. One of the methods that has been deemed effective in upgrading reinforced concrete (RC) structures is using externally bonded fiber-reinforced polymer (FRP) composites. However, the efficacy of this retrofitting technique is limited by the premature debonding failure of the FRP at the concrete-FRP interface; thus, the full capacity of the FRP is rarely utilized. Anchorage systems were proposed as a feasible solution to suppress or delay debonding failure. This paper presents an experimental investigation on the use of end U-wraps and carbon FRP (CFRP) spike anchors to anchor CFRP plates bonded to flexure-deficient RC beams. The experimental program consisted of seven RC beams with the length of the CFRP plate, type of anchorage, and the number of anchors as experimental variables. Test results indicated a remarkable enhancement in the ultimate load-carrying capacity when longer CFRP plates were used to strengthen the beams. In addition, anchoring the plates enhanced the strength of the CFRP-plated beams by 16–35% compared to the unanchored specimen, depending on the anchorage type and scheme. Finally, fib Bulletin 90 (2019) provisions provided the most accurate predictions of the moment capacity of the strengthened specimens.

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“…Additionally, it was shown that the interfacial bond's performance was dependent on the site of the anchorage. Anchoring FRP laminates at their ends with anchor bolts can effectively prevent brittle debonding failure while also improving bond shear resistance and ductility of the reinforced structures [25,26]. Such anchorage systems have the potential to significantly improve the interfacial bond between FRP and RC concrete surfaces [27].…”

Section: Introductionmentioning

confidence: 99%

Flexural Behavior of RC Beams Strengthened with GFRP Laminate and Retrofitting with Novelty of Adhesive Material

Rageh¹,

El-Mandouh

Elmasry³

et al. 2022

Buildings

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Two unique approaches were proposed to strengthen the bond between the glass fiber reinforcement polymer (GFRP) and the RC concrete surfaces. The two bonding materials are epoxy (EP) and geopolymer (GPP) with different ratios of short glass fibers (SGF). The experimental program includes seven reinforced concrete (RC) beams that have the same cross-section (150 mm × 200 mm) and are 1500 mm in length. The first beam is the control beam (B0-Control). The next three beams B1-0-GPP, B2-0.6-GPP, and B3-1.2-GPP have GPP with SGF ratios of 0%, 0.6%, and 1.2%, respectively. The last three beams B4-0-EP, B5-0.6-EP, and B6-1.2-EP have EP with SGF ratios of 0%, 0.6%, and 1.2%, respectively. The results show that the failure loads of beams B1-0-GPP, B2-0.60-GPP, and B3-1.2-GPP are greater than the control beam B0-Control by approximately 20.80%, 25.60%, and 31.40%, respectively, whereas the failure loads of beams B4-0-EP, B5-0.6-EP, and B6-1.2-EP are greater than the B0-Control by approximately 16.90%, 26.90%, and 26.10%, respectively; it is also noted that debonding occurs. In addition to the adhesive material, GPP has a great effect on increasing the beam’s failure load capacity due to the enhanced interfacial bond shear strength. Additionally, a finite-element program ABAQUS is performed to verify the experimental results.

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An effective improvement for enhancing the strength and feasibility of FRP spike anchors

Cited by 13 publications

References 27 publications

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

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

CFRP U-Wraps and Spike Anchors for Enhancing the Flexural Performance of CFRP-Plated RC Beams

Flexural Behavior of RC Beams Strengthened with GFRP Laminate and Retrofitting with Novelty of Adhesive Material

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