Performance of reinforced concrete slabs under punching loads

Said, Mohamed; Mahmoud, Ahmed A.; Salah, Ahmed

doi:10.1617/s11527-020-01509-5

Cited by 7 publications

(5 citation statements)

References 6 publications

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“…The deformability of reinforced concrete beams under a torsional moment is determined by the ductility factor, which is a crucial parameter. It can be defined as the ratio of the angle of twist (at 80% of the peak torsional moment on the descending part of torsional moment-angle of twist curve) to the angle of twist (at 80% of the peak torsional moment on the ascending part of torsional moment-angle of twist curve) [16,17].…”

Section: Ductility and Energy Absorptionmentioning

confidence: 99%

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Experimental investigation of fibrous reinforced concrete beams under torsion loads

Abdel-Ghaffar

Salaheldin

Erfan

et al. 2023

Engineering Research Journal - Faculty of Engineering (Shoubra)

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This experimental work investigates the effect of hybrid fiber between polypropylene fiber (PPF), and glass fiber (GF) on the torsional behavior of fiber-reinforced concrete (FRC) beams. Five reinforced concrete (RC) beams were subjected to a test of pure torsion and loaded until failure. The tested beams had various fiber contents: Specimen 1 is a control beam (without fiber), specimen 2 contains 1% GF, specimen 3 contains 1% PPF, specimen 4 contains 1% GF and 1% PPF, and specimen 5 contains 1.5% GF and 1.5% PPF in terms of volume. In the experimental tests, the torsional moment, crack pattern, ductility, and energy absorption of specimens were determined. Tests demonstrated that using a hybrid of PPF and GF enhanced the torsional moment, ductility, and energy absorption of RC beams. Consequently, the maximum torsional strength increased by 29.14%, and 39.43% when (1% PPF and 1% GF), and (1.5% PPF and 1.5% GF) were added, respectively.

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Section: Ductility and Energy Absorptionmentioning

confidence: 99%

“…The area underneath the torsional moment-angle of twist curve up to the peak torsional moment is known as energy absorption [16,17]. Figure 9 shows that employing hybrid fiber significantly increases the amount of energy absorbed by rotation.…”

Section: Ductility and Energy Absorptionmentioning

confidence: 99%

Experimental investigation of fibrous reinforced concrete beams under torsion loads

Abdel-Ghaffar

Salaheldin

Erfan

et al. 2023

Engineering Research Journal - Faculty of Engineering (Shoubra)

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“…The convergence tolerance, which  was discovered to be between 0.01 and 0.05, produced satisfactory results. The analytical ultimate load of the test specimen has been defined as the load level at which the convergence criteria was not met, suggesting numerical instability [14].…”

Section: Analytical Proceduresmentioning

confidence: 99%

Nonlinear Finite Element Analysis for Concrete Deep Beam Reinforced with GFRP Bars

Said

EL-Rakeeb

Salah

et al. 2021

JERR

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This work investigates the behavior of concrete deep beams reinforced with GFRP bars by conducting an experimental test on a half-scale GFRP deep beam and evaluating the findings by ANSYS software. Also, ANSYS was used to perform nonlinear finite element analysis NLFEA on five specimens with different reinforcement ratios of GFRP bars (0.15%, 0.41%, 0.53%, 0.67%, and 0.79%) to examine the influence of the GFRP reinforcement ratio on the behavior of deep beams. The outcomes of the experiment were sufficiently reflected in the analysis. The program's viability was confirmed by comparing it to accessible experimental data, and the agreement was found to be acceptable. Throughout the loading stages, the NLFEA produced a reasonable estimate of the center deflection for the test specimen. It was established that raising the specimen's reinforcement ratio led to an increase in beam capacity by (10 %, 18%, 31% and 47%) for reinforcement ratios (0.41%, 0.53%, 0.67% and 0.79%) and also the ultimate stiffness increased by (6%, 7%, 29%, and 44%) compared to specimen B1. Also found that the energy absorption enhanced by (23 %, 38 %, 106 %, and 152 %), on the opposite, this increase causes the specimen's deflection to decrease by (11 %, 17%, 52%, and 66%) by comparing to specimen B1. From the outputs results, it was found that the code provision was more conservative than the analytical model. For future work, Significant and cost-effective improvements to the manufacture of GFRP bars from locally sourced raw materials. Also, Extensive experimental work to investigate the long-term behavior of GFRP-reinforced concrete beams in harsh situations. The performance of GFRP reinforced specimens subjected to shear, fatigue, and cyclic stresses in service must be evaluated.

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“…Furthermore, the punching shear performance of geopolymer concrete slabs was discovered to be superior to that of regular concrete. Mahmoud et al [15][16] studied experimentally and numerically the behavior of reinforced concrete slabs under punching loads. Minh and Rovňák [17] studied experimentally six slab column connections at large scale reinforced by GFRP and steel bars with different tensile steel ratios.…”

Section: Introductionmentioning

confidence: 99%

Performance of Reinforced Concrete Flat Slabs Having GFRP Gratings

Mahmoud,

Mostafa,

Mostafa

et al. 2023

Frattura Ed Integrità Strutturale

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A thorough study of the literature indicated that there is not much relevant research on the application of GFRP gratings. Otherwise, extensive study has been done on FRP bars, laminates, sheets, strips, and rods. This study proposes a novel approach to improve the punching shear resistance of flat slab column connections by inserting GFRP gratings across the slab thickness. The results of seven specimens tested under vertical static loading are presented, considering the influence of the grating’s characteristics. All specimens were tested as simply supported slabs under one point of static loading. Experimental results, including crack patterns, slab deflection, concrete compressive strain, tensile steel strain, GFRP grating strain, and failure load, were recorded using extensive electric instrumentation. Test results revealed an enhancement in the failure load ranging between 9.03% and 27.67% for the specimens provided with the GFRP grating. In addition, a nonlinear finite element numerical model analysis was carried out using the ANSYS 15 program. Correlational studies based on the load-deflection response and crack patterns were utilized, resulting in a good agreement between numerical simulations and experimental results with differences ranging from 1.0% to 8.0%.

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Performance of reinforced concrete slabs under punching loads

Cited by 7 publications

References 6 publications

Experimental investigation of fibrous reinforced concrete beams under torsion loads

Experimental investigation of fibrous reinforced concrete beams under torsion loads

Nonlinear Finite Element Analysis for Concrete Deep Beam Reinforced with GFRP Bars

Performance of Reinforced Concrete Flat Slabs Having GFRP Gratings

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