A state of the art review on reinforced concrete beams with openings retrofitted with FRP

Osman, Bashir H.; Wu, Erjun; Ji, Bohai; Abdelgader, Abdeldime Mohamed Salih

doi:10.1007/s40091-016-0128-7

Cited by 27 publications

(17 citation statements)

References 30 publications

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“…For predicting the ultimate capacity of the beam with opening, the equation model proposed by Mansur and Tan (1999) [51] was tested. The model was modified from ACI-318 [56] and was popularly referred by the researchers [3,5,35,43,47,49,54,59], with or without modifications.…”

Section: Predicting the Ultimate Capacitymentioning

confidence: 99%

“…The opening in RC beams have been extensively studied through experiments, numerical modelling and analytical derivation [3][4][5][6], (a) in various types of beam, such as simply supported beams [7][8][9][10][11][12][13][14], deep beams [15][16][17][18][19][20][21][22][23][24][25][26][27], continuous beams [28,29], cantilever beams [2,30], T-beams [31][32][33][34][35][36], curved beams [37][38][39] and etc, and (b) subjected to various types of load, such as the flexural and shear loads [18,[40][41][42][43][44], torsional load [45,46], impact load [31], and seismic load [2,…”

Section: Introductionmentioning

confidence: 99%

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Behaviour of Reinforced Concrete Beams With Circular Transverse Openings Under Static Loads

Ling

Tang

Leong

et al. 2020

JSAE

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Transverse opening in a reinforced concrete beam allows the crossing of mechanical and electrical services through the beam. However, it affects the strength of a beam. Understanding its structural behaviour is crucial to ensure a safe design of the beam. For that, an experimental study was carried out on reinforced concrete beams with circular transverse openings. The four-point load test was conducted to study the effects of the size and the position of the opening on the beam performance under the shear and flexural loads. In addition, three reinforcing methods for the opening were tested. The beams were evaluated in terms of the load-displacement responses, mechanical properties, deflections, and failure modes. The opening with the diameter not exceeding 0.25 times beam height affected about 20% of beam strength (without reinforcements at the opening). The diagonal bar reinforcing method effectively restored the beam strength for the opening size not exceeding 1/3 of beam height. The equation model proposed conservatively predicted the ultimate capacity of the beam with a transverse opening.

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Section: Predicting the Ultimate Capacitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Behaviour of Reinforced Concrete Beams With Circular Transverse Openings Under Static Loads

Ling

Tang

Leong

et al. 2020

JSAE

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show abstract

“…In recent years, following the deterioration of building structures and the need for retrofitting structures to satisfy the strict design requirements, much emphasis has been placed on repairing buildings [1][2][3]. One of the methods that can prevent the loss of materials as much as possible and reduce construction debris is retrofitting of buildings [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Retrofitting of RC Beams using Reinforced Self-compacting Concrete Jackets Containing Aluminum Oxide Nanoparticles

Faez

Sayari

Manei

2021

IJE

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The purpose of this study was to introduce a proposed method to retrofit RC beams. For this purpose self-compacting concrete containing aluminium oxide nanoparticles (ANPs) and silica fume (SF) was used in RC jackets. The laboratory experiment and numerical simulation were used to investigate the behavior of the beams. The experimental variables were included the amount of ANPs used in the jackets (0 and 2.5% by weight of cement) and the surface interaction between beam and jacket (75% and 100% of the side and bottom surfaces of the beam). Five RC beams with a length of 1.4 m and the same dimensions were made and subjected to four-point loading. After completing the laboratory steps, RC beams were simulated according to laboratory conditions using the finite element method and ABAQUS software. After verifying the used method, parametric analysis was performed and parameters such as beam span length (1.5, 3, 4.5 m), concrete jacket thickness (4, 8, and 12 cm), and the diameter of the bars used in the jacket (8, 10 and 12 mm) were examined. The results showed that the use of RC jackets containing ANPs, depending on the jacket thickness, the diameter of the bars used in the jacket, and the length of the beam span increased the beams flexural strength by 155 to 447%. It was observed that the crushing of concrete without nanoparticles compared to concrete contain nanoparticles is more severe because nanoparticles affected the concrete matrix and reduced its crushing in RC jackets.

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“…During the laying procedure of utility pipes and conduits, problems may occur [16]. The opening positions in the deep beam are provided or re-located by the mechanical and electrical engineers [39]. The structural engineer analyses the identified drilled position so that it may not exist in the critical region [16].…”

Section: Introductionmentioning

confidence: 99%

Strengthening the Structural Behavior of Web Openings in RC Deep Beam Using CFRP

et al. 2020

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Deep beams are more susceptible to shear failure, and therefore reparation is a crucial for structural reinforcements. Shear failure is structural concrete failure in nature. It generally occurs without warning; however, it is acceptable for the beam to fail in bending but not in shear. The experimental study presented the structural behavior of the deep beams of reinforced concrete (RC) that reinforces the web openings with externally connected carbon fiber reinforced polymer (CFRP) composite in the shear zone. The structural behavior includes a failure mode, and cracking pattern, load deflection responses, stress concentration and the reinforcement factor were investigated. A total of nine reinforced concrete deep beams with openings strengthened with CFRP and one control beam without an opening have been cast and tested under static four-point bending load till failure. The experimental results showed that the increase the size of the opening causes an increase in the shear strength reduction by up to 30%. Therefore, the larger the openings, the lower the capability of load carriage, in addition to an increase in the number of CFRP layers that could enhance the load carrying capacity. Consequently, utilization of the CFRP layer wrapping technique strengthened the shear behavior of the reinforced concrete deep beams from about 10% to 40%. It was concluded that the most effective number of CFRP layers for the deep beam with opening sizes of 150 mm and 200 mm were two layers and three layers, respectively.

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A state of the art review on reinforced concrete beams with openings retrofitted with FRP

Cited by 27 publications

References 30 publications

Behaviour of Reinforced Concrete Beams With Circular Transverse Openings Under Static Loads

Behaviour of Reinforced Concrete Beams With Circular Transverse Openings Under Static Loads

Retrofitting of RC Beams using Reinforced Self-compacting Concrete Jackets Containing Aluminum Oxide Nanoparticles

Strengthening the Structural Behavior of Web Openings in RC Deep Beam Using CFRP

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