Behavior of FRP-Strengthened RC Beams with Large Rectangular Web Openings in Flexure Zones: Experimental and Numerical Study

Almusallam, Tarek; Al-Salloum, Yousef; Elsanadedy, Hussein M.; Alshenawy, Abdulhafiz O.; Iqbal, Rizwan A.

doi:10.1186/s40069-018-0272-5

Cited by 30 publications

(34 citation statements)

References 28 publications

(30 reference statements)

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“…A number of studies have been reported in the literature on the behavior and strength of reinforced concrete deep beams with openings (Ashour and Rishi, 2000; Jasim et al, 2018; Kong and Sharp, 1977; Mansur and Alwis, 1984; Shanmugam and Swaddiwudhipong, 1988). Some researchers studied the effect of strengthening, using carbon fiber–reinforced polymer (CFRP) around openings, on upgrading the strength of flexural concrete members (Abdalla et al, 2003; Almusallam et al, 2018; El-Maaddawy and Sherif, 2009; Hawileh et al, 2013; Mansur and Tan, 1999; Nie et al, 2018).…”

Section: Introduction and Research Significancementioning

confidence: 99%

Strength compensation of deep beams with large web openings using carbon fiber–reinforced polymer sheets

Allawi

Oukaili

Jasim

2020

Advances in Structural Engineering

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This article presents the results of an experimental investigation of using carbon fiber–reinforced polymer sheets to enhance the behavior of reinforced concrete deep beams with large web openings in shear spans. A set of 18 specimens were fabricated and tested up to a failure to evaluate the structural performance in terms of cracking, deformation, and load-carrying capacity. All tested specimens were with 1500-mm length, 500-mm cross-sectional deep, and 150-mm wide. Parameters that studied were opening size, opening location, and the strengthening factor. Two deep beams were implemented as control specimens without opening and without strengthening. Eight deep beams were fabricated with openings but without strengthening, while the other eight deep beams were with openings in shear spans and with carbon fiber–reinforced polymer sheet strengthening around opening zones. The opening size was adopted to be 200 × 200 mm dimensions in eight deep beams, while it was considered to be 230 × 230 mm dimensions in the other eight specimens. In eight specimens the opening was located at the center of the shear span, while in the other eight beams the opening was attached to the interior edge of the shear span. Carbon fiber–reinforced polymer sheets were installed around openings to compensate for the cutout area of concrete. Results gained from the experimental test showed that the creation of openings in shear spans affect the load-carrying capacity, where the reduction of the failure load for specimens with the opening but without strengthening may attain 66% compared to deep beams without openings. On the other hand, the strengthening by carbon fiber–reinforced polymer sheets for beams with openings increased the failure load by 20%–47% compared with the identical deep beam without strengthening. A significant contribution of carbon fiber–reinforced polymer sheets in restricting the deformability of deep beams was observed.

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Section: Introduction and Research Significancementioning

confidence: 99%

Strength compensation of deep beams with large web openings using carbon fiber–reinforced polymer sheets

Allawi

Oukaili

Jasim

2020

Advances in Structural Engineering

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“…Previous research studies have been conducted on the behavior and strengthening of simply supported reinforced concrete deep beams with and without openings [ 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 ]. The creation of rectangular and circular openings in shear spans of the reinforced concrete deep beams affect the load-carrying capacity, where the reduction of the failure load reached 66% [ 6 , 8 ].…”

Section: Introductionmentioning

confidence: 99%

Strengthening of Continuous Reinforced Concrete Deep Beams with Large Openings Using CFRP Strips

et al. 2021

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To accommodate utilities in buildings, different sizes of openings are provided in the web of reinforced concrete deep beams, which cause reductions in the beam strength and stiffness. This paper aims to investigate experimentally and numerically the effectiveness of using carbon fiber reinforced polymer (CFRP) strips, as a strengthening technique, to externally strengthen reinforced concrete continuous deep beams (RCCDBs) with large openings. The experimental work included testing three RCCDBs under five-point bending. A reference specimen was prepared without openings to explore the reductions in strength and stiffness after providing large openings. Openings were created symmetrically at the center of spans of the other specimens to represent 40% of the overall beam depth. Moreover, finite elements (FE) analysis was validated using the experimental results to conduct a parametric study on RCCDBs strengthened with CFRP strips. The results confirmed reductions in the ultimate load by 21% and 7% for the un-strengthened and strengthened specimens, respectively, due to the large openings. Although the large openings caused reductions in capacities, the CFRP strips limited the deterioration by enhancing the specimen capacity by 17% relative to the un-strengthened one.

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“…Failure loads are largely affected by the strengthening scheme and are slightly affected by spacing. Tarek et al [6] investigated the response of FRP strengthened RC beams containing large rectangular web openings in the flexure zone. Parameters studied included type of loading, opening size, and strengthening scheme.…”

Section: Introductionmentioning

confidence: 99%

CFRP Strengthening of Beams in Reinforced Concrete Frames with Openings in Shear Zone

Mohamed¹,

Khattab²

2021

International Conference on Civil, Structural and Transportation Engineering

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Openings through reinforced concrete frame beams are often necessary to accommodate utility pipes and/or ducts. Openings in flexural members may decrease their load-carrying capacity and stiffness leading to increased deflection. This paper presents the findings of a numerical study that examined the effectiveness of carbon fibre reinforced polymer (CFRP) fabric in strengthening reinforced concrete flexural members with openings. The effectiveness of different strengthening configurations in the vicinity of openings in the shear zone are evaluated by modelling nine frames and comparing the results to the 10 th (control) frame with has opening but without strengthening. The FRP fabric configurations included strengthening around the opening, inside the opening, and both around and inside the opening. In addition, for each of the configurations, the thickness of fabric layers was varied. Finite element models demonstrated that CFRP strengthening increases the ultimate load-carrying capacity and decreases deflection. However, increasing CFRP sheet thickness has little effect on the maximum load capacity.

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Behavior of FRP-Strengthened RC Beams with Large Rectangular Web Openings in Flexure Zones: Experimental and Numerical Study

Cited by 30 publications

References 28 publications

Strength compensation of deep beams with large web openings using carbon fiber–reinforced polymer sheets

Strength compensation of deep beams with large web openings using carbon fiber–reinforced polymer sheets

Strengthening of Continuous Reinforced Concrete Deep Beams with Large Openings Using CFRP Strips

CFRP Strengthening of Beams in Reinforced Concrete Frames with Openings in Shear Zone

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