RETRACTED: Behaviour of RC flat slabs with openings strengthened with CFRP

El-Mandouh, Mahmoud A.; Omar, Mostafa S.; El-Maula, Ahmed S. Abd

doi:10.1016/j.cscm.2021.e00587

Cited by 4 publications

(3 citation statements)

References 3 publications

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“…In contrast, slabs with small-size openings could maintain their behavior and internal stability [1,2]. In addition, the position of the opening plays a major role in determining the resulting strength and ductility reduction with respect to the maximum positive and negative moment regions [3][4][5][6][7]. It is recommended that RC slabs are designed based on the strip method, despite the lack of existing literature on this topic and the need for further investigations, as inadequate calculations and precise instruction can cause the strip method to underestimate the RC slab's load capacity [8].…”

Section: Introductionmentioning

confidence: 99%

NLFEA of the Behavior of Polypropylene-Fiber-Reinforced Concrete Slabs with Square Opening

Al-Rousan,

Alnemrawi

2024

Buildings

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The bending behavior of one-war reinforced concrete (RC) slabs with polypropylene fibers (PF) was examined in this study under the effect of different opening ratios using the nonlinear finite element analysis (NLFEA) method. The investigated parameters include the effect of different square opening ratios between 0 and 24% and PF volume percentages between 0 and 1% with 0.1% increments. The objectives of this study were fulfilled using 88 NLFEA models with different combinations of the studied parameters, including 11 control slabs without openings. The slab’s behavior was studied focusing on different structural performance characteristics, such as ductility, using energy-based and deflection-based approaches, stiffness (initial and yielding), cracking, and ultimate load strength. In addition, other structural performance parameters were considered, such as the crack opening, failure modes, and strain values, which were recorded for all specimens during the loading history. Moreover, the load-carrying capacity of the slabs was compared, looking at the NLFEA method’s results and the theoretical prediction results based on the sectional analysis method. However, it was observed that the inclusion of PFs of different percentages has a superior effect on the behavior of RC slabs with small openings (less than 2% opening ratio) compared to the acceptable improvements obtained for sabs with larger opening sizes. Consequently, PF could be utilized as a replacement for conventional steel rebars for RC slabs with small openings. In addition, increasing the PF percentage increases the resulting crack-opening value at failure due to the provided stabilization effect, in addition to increasing the system’s ability to sustain loads.

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Section: Introductionmentioning

confidence: 99%

NLFEA of the Behavior of Polypropylene-Fiber-Reinforced Concrete Slabs with Square Opening

Al-Rousan,

Alnemrawi

2024

Buildings

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“…A numerical study was also conducted using finite element (FE) software (ANSYS), reporting that the FE model represented the ultimate torque with a divergence of less than 13% from the experimental measurements, yet postcrack behavior was not well captured. Mahmoud [21] studied the behavior of 9 half scale RC continuous flat slabs include openings and without openings, noting that the size limit of the openings were in accordance with the Egyptian Code (ECP 203-2007), and ACI 318-19. The RC slabs were strengthened with CFRP.…”

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confidence: 99%

“…Figures(17)(18)(19)(20)(21)(22)(23)(24)(25)(26)(27) represent the failure pattern of all beams, revealing the tension damage of the FE model. These figures clearly show that the primary mode of failure was twisting.…”

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confidence: 99%

Numerical study on the torsional behavior of CFRP-strengthened RC beams

Noha Yehia Elwakkad

2023

Global J. Eng. Technol. Adv.

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The present paper offers a numerical study on the behavior of reinforced concrete (RC) beams strengthened with carbon fiber reinforced polymer (CFRP) under pure torsional loading. The failure mode of RC beams significantly changed in accordance with torsional loading. Therefore, the effect of strengthening RC beams by CFRP under torsion is a vital area of study. This paper attempted to fill the gap by conducting a numerical (Abaqus) study, whereby the numerical investigation was in line with the parametric for a previous study of an experimental program. The numerical model achieved agreement with the results of the experimental program, then, this model was used by applying CFRP, instead of GFRP. Additionally, the numerical study was completely in line with the parametric study in terms of sample dimensions, steel reinforcement, number of FRP layers, and width of FRP strips, for the aim of comparing results. The comparative evaluation in this study aims to contrast the behavior of RC beams strengthened by CFRP with the behavior of those strengthened by GFRP under pure torsion. Parameters such as ultimate torsional moment, and the maximum angle of twist were studied. The study revealed that strengthening with CFRP improved the ultimate strength and post-cracking stiffness, in addition to localizing the damage.

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Experimental investigation on performance assessment of flab slabs strengthened using basalt fiber-reinforced polymers

Gowda

Ravindra

2023

Asian J Civ Eng

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RETRACTED: Behaviour of RC flat slabs with openings strengthened with CFRP

Cited by 4 publications

References 3 publications

NLFEA of the Behavior of Polypropylene-Fiber-Reinforced Concrete Slabs with Square Opening

NLFEA of the Behavior of Polypropylene-Fiber-Reinforced Concrete Slabs with Square Opening

Numerical study on the torsional behavior of CFRP-strengthened RC beams

Experimental investigation on performance assessment of flab slabs strengthened using basalt fiber-reinforced polymers

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