Behavior of reinforced concrete deep beam with web openings strengthened with (CFRP) sheet

Jasim, Waleed A.; Tahnat, Yazan B. Abu; Halahla, Abdulsamee M.

doi:10.1016/j.istruc.2020.05.003

Cited by 47 publications

(17 citation statements)

References 32 publications

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“…Several structural elements behave as deep beams; walls of bunkers, load-bearing walls in buildings, transfer beams in high-rise buildings, and pile caps are the typical examples [1,2]. It is wellknown that the behavior of long-span beams (Bernoulli beams) is governed mainly by flexure that results in the bending stress which is higher compared to the shear stress as observed in previous experimental studies [3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Effect of fiber amount and stirrup ratio on shear resistance of steel fiber reinforced concrete deep beams

Do-Dai

Tran

Nguyen-Minh

2021

STCE

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This paper deals with the effect of steel fiber amounts and the interaction between the fiber amount and stirrup ratio on the shear behavior and capacity of reinforced concrete (RC) deep beams with steel fibers. The experimental program was carried out on twelve deep beams with different fiber amounts (0, 30, 40, and 65 kg/m3) and stirrup ratios (0.1, 0.15, and 0.25%). The test results have shown that the use of steel fibers increased the shear resistance (up to 55%), reduced the shear crack width (up to 11 times) and deflection (up to 57%) of the tested deep beams. Also, it was found that using unsuitable steel fiber amount and stirrup ratio would reduce the efficiency of the fibers in a deep beam due to the interaction between the fibers and stirrups. Increasing the stirrup ratio in a deep beam with a high amount of steel fibers can reduce the efficacy of the fibers in enhancing the shear capacity of the beam. The most cost-effective steel fiber amount was found to be around 30 to 45 kg/m3. Keywords: steel fibers; deep beam; shear capacity; fiber amount; stirrup ratio.

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Section: Introductionmentioning

confidence: 99%

Effect of fiber amount and stirrup ratio on shear resistance of steel fiber reinforced concrete deep beams

Do-Dai

Tran

Nguyen-Minh

2021

STCE

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“…So far, compared with the experimental studies on this topic, the existing numerical studies on RC beams with an FRP-strengthened web opening are fewer. A total of 13 relevant FE studies can be found in the literature (Almusallam et al, 2018; Chin et al, 2012, 2016; Elsanadedy et al, 2019; Hassan et al, 2017; Hawileh et al, 2012; Jasim et al, 2020; Mahmoud, 2012; Mansour, 2021; Nie et al, 2020b, 2021a; Pimanmas, 2010; Salih et al, 2020), among which 11 studies were concerned with RC normal beams and the other two studies focused on RC deep beams. Based on the smeared crack approach, Pimanmas (2010) conducted two-dimensional (2-D) nonlinear FE analyses of RC beams with a rectangular web opening strengthened with near-surface mounted FRP bars.…”

Section: Existing Numerical Studiesmentioning

confidence: 99%

“…Based on ANSYS (2007), Hawileh et al (2012) proposed a 3-D nonlinear FE model for RC deep beams with a rectangular web opening strengthened with externally bonded FRP sheets, U-jackets and complete wraps. By using ABAQUS (2012), Jasim et al (2020) conducted 3-D nonlinear FE studies of RC deep beams with a rectangular web opening strengthened with externally bonded FRP sheets.…”

Section: Existing Numerical Studiesmentioning

confidence: 99%

A review on the behaviour of reinforced concrete beams with fibre-reinforced polymer-strengthened web openings

Nie

Zhang

Gao

et al. 2021

Advances in Structural Engineering

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Web openings often need to be created in reinforced concrete (RC) beams for the passages of utility ducts and/or pipes. Such web openings reduce the cross-section area of the beam in the affected region, leading to decrease in its load-carrying capacity and stiffness. Therefore, a fibre-reinforced polymer (FRP)-strengthening system generally needs to be applied around the web opening to ensure the safety of the weakened beam. A number of studies have been conducted by researchers all over the world to examine the behaviour of RC beams with FRP-strengthened web opening/web openings, and plenty of useful findings have been generated. This article presents a critical literature review of existing relevant research from three aspects: experimental studies, numerical studies and theoretical studies. The effect of main factors, including the size, shape, location and number of the web opening, the shape and shear span ratio of the beam, the concrete strength, the loading scheme and the FRP-strengthening scheme, on the structural performance of RC beams with FRP-strengthened web opening/web openings have been thoroughly analysed and discussed. Finally, directions for future research based on the gaps which exist in existing studies are pointed out.

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“…Openings must be designed in deep RC beams for electrical and computer network cables, mechanical installations, or commuting from room to room [11][12][13][14]. These openings interrupt the transfer of compressive forces from the place of application of the load to the abutment and cause it to collapse, and many cases requiring retrofitting [15][16][17][18][19][20][21]. Zhang et al [22] investigated RC deep 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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Behavior of reinforced concrete deep beam with web openings strengthened with (CFRP) sheet

Cited by 47 publications

References 32 publications

Effect of fiber amount and stirrup ratio on shear resistance of steel fiber reinforced concrete deep beams

Effect of fiber amount and stirrup ratio on shear resistance of steel fiber reinforced concrete deep beams

A review on the behaviour of reinforced concrete beams with fibre-reinforced polymer-strengthened web openings

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

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