Retrofitting of shear-damaged RC T-beams using U-shaped SHCC jacket

Hassan, Ali; Baraghith, Ahmed T.; Atta, A.A.; El-Shafiey, Tarek F.

doi:10.1016/j.engstruct.2021.112892

Cited by 19 publications

(4 citation statements)

References 45 publications

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“…Further studies may address the impact of the surface treatment on the performance of concrete–UDFRC composite beams. It is noteworthy that this finding is consistent with some studies in the literature [ 31 , 50 , 51 ]. Likewise, this replacement seemed to delay cracking and steel yielding since the corresponding deflections were higher (19.2–56.6%) than those of the control beams.…”

Section: Resultssupporting

confidence: 93%

Behavioral Evaluation of Strengthened Reinforced Concrete Beams with Ultra-Ductile Fiber-Reinforced Cementitious Composite Layers

Khan

Abbas

2023

Materials

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In the literature, there is little information available regarding the behavior of composite beams made up of reinforced concrete (RC) and ultra-ductile fiber-reinforced concrete (UDFRC). In this study, UDFRC was examined for its effectiveness in enhancing the strength of RC beams. With a tensile strength of 4.35 MPa and a strain capacity of 2.5%, PVA-based UDFRC was prepared. The performance of 12 medium-sized reinforced concrete (RC) beams was measured under four-point flexural loading. The beams measured 1800 mm long, 150 mm wide, and 200–260 mm deep. The experimental program on beam specimens was divided into two phases. In the first, four 150 × 200 × 1800 mm RC beams with UDFRC layer thicknesses of 0, 30, 60, and 90 mm were tested. Additionally, four concrete and four concrete–UDFRC beams were investigated, measuring 150 × 230 × 1800 mm and 150 × 260 × 1800 mm, respectively. The study focused on medium-sized, slender RC beams under quasi-static loads and room temperature with additional or substituted UDFRC layers. As a result of replacing concrete with UDFRC, the load-carrying capacity at first crack and steel yield significantly increased between 18.4 and 43.1%, but the ultimate load-carrying capacity increased only in the range of 6.3–10.8%. Furthermore, beams with additional UDFRC layers could carry 30–50% more load than their concrete counterparts. An RC-UDFRC beam had a load-carrying capacity 10–15% greater than that of a comparable RC beam. Generally, there is a lower deflection response in UDFRC–concrete composite RC beams than in control concrete beams. The UDFRC layering can potentially improve the load-carrying capacity of RC beams, at least when ductility provisions are considered.

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Section: Resultssupporting

confidence: 93%

Behavioral Evaluation of Strengthened Reinforced Concrete Beams with Ultra-Ductile Fiber-Reinforced Cementitious Composite Layers

Khan

Abbas

2023

Materials

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“…The T-section beam (T-beam) is one of the most commonly used components because it is relatively light in weight and flexible for bridge engineering. Past and recent research has focused mainly on the performance of retrofitted T-beams [1][2][3][4][5][6][7][8][9][10][11] and has found that the morphology, number, propagation forms, and space of the flexural cracks are all related to the compressive strength of concrete, while the initial stiffness is related to its tensile strength [12]. The height-to-span ratio has a major influence on the flexural performance of T-beams, especially for beams with a span longer than 10 m. Prestressing technology is usually used to improve the flexural performance of T-beams [13], as achieving super spans without prestressing techniques is difficult.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Flexural Properties of FRP-Reinforced Super-Span Concrete T-Beam after Service

et al. 2023

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Super-span (20 m) non-prestressed T-section reinforced concrete beams have been in service for more than 30 years and are common in Chinese highway bridges. However, the actual performance of these super-span T-section reinforced concrete (RC) beams that have been reinforced with FRP, including their process of failure from a service state to a failure state, has not been determined. In this study, original RC T-beams, with a 20 m span and retrofitted with FRP, were taken from a highway bridge. Their flexural performance was detected via experiments in a laboratory. The experiments revealed that the sectional strain distribution is more non-uniform. The mid-span ribs clearly play a role in strengthening the section and the bearing reservation was studied based on a subsequent sectional analysis. It became clear that the load-bearing reservation of an old super-span T-beam changes during the entire life of the specimen; not only because of the depression of the resistant capacity and the reinforced measure, but also due to the updates to load codes.

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“…They investigated a type of composite steel-concrete jacket in RC beams and found that the proposed method can increase the bearing capacity of RC beams by about 2.25 times. Hassan et al [8] retrofitted damaged beams using strain-hardening cementitious composites. They showed that the proposed method could increase the shear capacity of the damaged beam by about 27%.…”

Section: Introductionmentioning

confidence: 99%

Retrofitting of Reinforced Concrete Beams using Lightweight RC Jacket Containing Silica Nano Particles and Glass Fiber

Ghanbari¹,

Kohnehpooshi²,

Tohidi³

2022

IJE

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The concrete jacket method is a common method used in retrofitting buildings. Although this method has many advantages, engineers criticize it due to an increase in the structure's weight. In the present study, lightweight concretes containing silica nanoparticles (SNPs) and glass fibers (GF) have been used in concrete jackets to strengthen concrete beams. Several reinforced concrete (RC) beams were constructed and retrofitted using the proposed lightweight concrete jackets and their response to fourpoint loading was evaluated. The SNPs amount in the lightweight concrete jackets was 0, 2, 4, and 6% by weight of cement and the amount of GF was 1.5% by volume of concrete. Load-deflection curves were extracted and the response of the beams was examined by parameters such as crack load, yield load, maximum load, energy absorption capacity, and ductility. The proposed lightweight concrete jacket containing 1.5% of GFs in which 0, 2, 4, and 6% of SNPs were used, increased the energy absorption capacity by 33%, 54%, 61%, and 62%, respectively. The presence of SNPs in lightweight concrete reinforced by GFs leads to the filling of small cavities in the concrete. Also, the bearing capacity of the retrofitted RC beams increased with an increase in SNPs in the concrete jacket. A portion of this increase can be attributed to an increase in tensile and compressive strength of the proposed concrete, and the other part can be attributed to the effect of SNPs on the surrounding surfaces of the main beam and jacket.

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Retrofitting of shear-damaged RC T-beams using U-shaped SHCC jacket

Cited by 19 publications

References 45 publications

Behavioral Evaluation of Strengthened Reinforced Concrete Beams with Ultra-Ductile Fiber-Reinforced Cementitious Composite Layers

Behavioral Evaluation of Strengthened Reinforced Concrete Beams with Ultra-Ductile Fiber-Reinforced Cementitious Composite Layers

Experimental Study on the Flexural Properties of FRP-Reinforced Super-Span Concrete T-Beam after Service

Retrofitting of Reinforced Concrete Beams using Lightweight RC Jacket Containing Silica Nano Particles and Glass Fiber

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