Behaviour of reinforced GFRP bars concrete beams having strengthened splices using CFRP sheets

Mahmoud, Akram S.; Ali, Ziadoon M.

doi:10.1177/13694332211001515

Cited by 8 publications

(3 citation statements)

References 12 publications

(8 reference statements)

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“…The traditional technique of FRP strengthening is externally bonding the FRP sheets/plates onto the surface of RC members (e.g. Ahmad et al, 2021; Allawi et al, 2021; Cao et al, 2021; Mahmoud and Ali 2021; Oehlers et al, 2016; Teng et al, 2002). However, it was found that the externally bonded (EB) FRP is likely to debond from the RC members, and the EB FRP is sensitive to the environmental factors such as fire, incision and ultraviolet radiation (e.g.…”

Section: Introductionmentioning

confidence: 99%

Shear strengthening of RC beams with NSM FRP. I: Review of strength models

Jedrzejko

Zhang

Yan

et al. 2022

Advances in Structural Engineering

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Near-surface mounted (NSM) fiber-reinforced polymer (FRP) technique is known as a promising alternative to the externally bonded (EB) FRP technique for strengthening reinforced concrete (RC) members, on account of its many advantages such as high bond efficiency with concrete and good durability. Shear strengthening of RC beams by near-surface mounting the FRP bars/strips into the concrete cover on beam sides is one of the most prevalent applications of NSM FRP. Abundant experimental studies have been conducted to investigate the behaviour of NSM FRP shear strengthened beams, and many strength models for predicting the contribution of NSM FRPs to the shear capacity of the beam have been proposed. The present paper presents a comprehensive review of these strength models, in which all the models collected from the existing literature are first classified into three categories based on their used approach and then summarized and discussed. This paper not only aims to bring a deep understanding of the existing strength models for NSM FRP shear strengthened RC beams, but also provides a background and basis for the assessment of these models by using the newly-generated experimental database in the companion paper.

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Section: Introductionmentioning

confidence: 99%

Shear strengthening of RC beams with NSM FRP. I: Review of strength models

Jedrzejko

Zhang

Yan

et al. 2022

Advances in Structural Engineering

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“…It is important that ductility is taken into account prior to the failure of any structure. As compared to brittle structures, RC structures with ductile properties provide ample warning before failure [28][29][30][31]. e deflection ductility index of the specimen is derived using the load deflection diagram by using the following equations, displacement method in equation ( 1), and energy method in equation ( 2):…”

Section: Ductilitymentioning

confidence: 99%

Flexural Ductility, Stiffness, and Toughness of New Voided Reinforced Concrete One-Way Slab Using Waste Plastic Bottles

Rajab

Ali

Mahmoud

et al. 2022

Journal of Engineering

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The enhancement of concrete structures’ performance can easily be achieved. However, the main challenge is how to achieve this performance with respect to the economy and sustainability. The aim of this research is to examine the flexural strength, ductility, stiffness, and toughness of RC hollow one-way slabs that are voided by plastic bottles. A new technique of hollowing has been used in this work, where a steel mesh tube was prepared previously and filled manually with blank waste plastic bottles to form a light tube. This technique has some advantages including ease of installation and adequate bonding for the main steel reinforcements. Five RC one-way slabs were cast and tested in the lab to investigate some variables: the presence of hollow, the ratio of reinforcement, and slab thickness. Briefly, a new technique for voids enhances the flexural behavior with less concrete and weight. The ductility is increased by about 100% for the voided specimens for the same section’s thickness. Also, the rotation in supports had been reduced by about 30% when the thickness of voided slab was increased by about 15%.

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“…Extensive research has been conducted on retrofitting RC beams using FRP in the past decades [7][8][9][10]; most of which have been to achieve the maximum capacity of FRP and thus maximize the bearing capacity of existing beams.…”

Section: Introductionmentioning

confidence: 99%

Experimental Comparison of Different Types of FRP Wrapping in Repairing of RC Deep Beams with Circular Openings

Rahimi

Jalali

Mirhoseini³

et al. 2021

IJE

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Openings of reinforced concrete (RC) deep beams can be used to pass electrical, mechanical, and architectural equipment. A comparative experimental study of fiber reinforced polymer (FRP) type on the performance of deep RC beams with the circular opening was the most important purpose of this study. The variables were FRP type (carbon, glass, and aramid) and the number of layers (1, 2, and 3). The geometric and rebar characteristics of the beams were considered constant in all cases. Deep RC beams were constructed, and their response to four-point loading was evaluated. Depending on the layers (1, 2 and, 3), aramid, carbon and glass fiber reinforced polymers (AFRP, CFRP, and GFRP) sheets increased the maximum load by about 65 to 94%, 87 to 130%, and 133 to 196%, respectively. In RC deep beams retrofitted with GFRP sheets, the sheet separation from the beam surface decreased with expanding the number of layers. The CFRP sheets debonded from the beam surface at the supports along the center of the circular opening. CFRP showed much better performance in energy absorption capacity and load capacity than AFRP and GFRP. The CFRP were debonded from the beam surface at the moment of rupture. However, no significant separation was observed in RC deep beams retrofitted with AFRP and GFRP sheets. SEM images of the cores specimens showed that the fracture surface of the specimens extracted from the beam retrofitted with GFRP and CFRP sheets was much rougher than the control specimen, which indicates a stronger bond between the concrete components.

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Behaviour of reinforced GFRP bars concrete beams having strengthened splices using CFRP sheets

Cited by 8 publications

References 12 publications

Shear strengthening of RC beams with NSM FRP. I: Review of strength models

Shear strengthening of RC beams with NSM FRP. I: Review of strength models

Flexural Ductility, Stiffness, and Toughness of New Voided Reinforced Concrete One-Way Slab Using Waste Plastic Bottles

Experimental Comparison of Different Types of FRP Wrapping in Repairing of RC Deep Beams with Circular Openings

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