Effect of Load Distribution and Variable Depth on Shear Resistance of Slender Beams without Stirrups

doi:10.14359/51684037

Cited by 10 publications

(3 citation statements)

References 12 publications

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“…In cases where the major tensile stresses in the shear region of a RC beam exceed the concrete tensile strength, diagonal cracks finally cause failure. Several experimental and theoretical studies have confirmed that the key parameters affecting the response of RC beams are the type and direction of external loads, the shape and dimensions of the specimen, the strength of the concrete and steel reinforcement, the shear span to depth ratio and the reinforcement arrangement [1][2][3][4][5][6][7][8]. Depending on the factors, the ultimate loads and failure modes can change.…”

Section: Introductionmentioning

confidence: 98%

Hybrid Fibres as Shear Reinforcement in High-Performance Concrete Beams with and without Openings

Smarzewski¹

2018

Applied Sciences

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The article presents the results of research work aimed at testing the use of hybrid steel-polypropylene fibre as a strengthening solution to upgrade reinforced high-performance concrete (HPC) beams with openings (BO1 ÷ BO3) and without (B1 ÷ B3). A total of six simply supported beams were tested under four-point bending. The test beams had a cross section of 200 × 400 mm and a total length of 2500 mm. Two square openings in each shear span were located symmetrically about the mid-point in three BO beams. Research was carried out with regard to the quantity and type of reinforcement. Beams B1 and BO1 were constructed with traditional reinforcement made of steel bars. As regards the remaining beams, instead of stirrups and compressive bars, fibre reinforcement of varying fibre volume contents was applied. In the analysis, a non-contact system for three-dimensional measurements of strain and displacement was used. Analysis of the behaviour of the beams under static load was based on the measurements of cracks, deflections and strains. The test results show that the first diagonal crack and the ultimate shear strength increase significantly as the fibre content increases. The above study showed that the hybrid fibres have a positive effect, reducing crack width and ensuring an increase in the load-bearing capacity.

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Section: Introductionmentioning

confidence: 98%

Hybrid Fibres as Shear Reinforcement in High-Performance Concrete Beams with and without Openings

Smarzewski¹

2018

Applied Sciences

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“…The failure mechanism of non-prismatic beams was pronounced by the arching action within the haunched length that substantially differed from the behavior of prismatic beams. Caldentey et al [ 19 ] found that a tapered section substantially reduced the ultimate capacity of beams in comparison to that of prismatic beams. Qissab and Salman [ 20 ] found a 45.5% reduction in the ultimate shear capacity when the tapered angle increased from 7° to 12°.…”

Section: Introductionmentioning

confidence: 99%

Load-Bearing Performance of Non-Prismatic RC Beams Wrapped with Carbon FRP Composites

Suparp

Ejaz

Khan

et al. 2023

Sensors

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This study investigated the influence of CFRP composite wrapping techniques on the load–deflection and strain relationships of non-prismatic RC beams. A total of twelve non-prismatic beams with and without openings were tested in the present study. The length of the non-prismatic section was also varied to assess the effect on the behavior and load capacity of non-prismatic beams. The strengthening of beams was performed by using carbon fiber-reinforced polymer (CFRP) composites in the form of individual strips or full wraps. The linear variable differential transducers and strain gauges were installed at the steel bars to observe the load–deflection and strain responses of non-prismatic RC beams, respectively. The cracking behavior of unstrengthened beams was accompanied by excessive flexural and shear cracks. The influence of CFRP strips and full wraps was primarily observed in solid section beams without shear cracks, resulting in enhanced performance. In contrast, hollow section strengthened beams exhibited minor shear cracks alongside the primary flexural cracks within the constant moment region. The absence of shear cracks was reflected in the load–deflection curves of strengthened beams, which demonstrated a ductile behavior. The strengthened beams demonstrated 40% to 70% higher peak loads than control beams, whereas the ultimate deflection was increased up to 524.87% compared to that of the control beams. The improvement in the peak load was more prominent as the length of the non-prismatic section increased. A better improvement in ductility was achieved for the case of CFRP strips in the case of short non-prismatic lengths, whereas the efficiency of CFRP strips was reduced as the length of the non-prismatic section increased. Moreover, the load–strain capacity of CFRP-strengthened non-prismatic RC beams was higher than the control beams.

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“…In [13][14][15] sind experimentelle Untersuchungen an Kragbalken ohne Querkraftbewehrung unter gleich-und trapezförmigen Belastungen dokumentiert. Die Versuchsergebnisse zeigen, dass die Querkrafttragfähigkeiten von Kragbalken unter verteilten Lasten größer als diejenigen der Krag-oder Einfeldbalken unter Einzellasten sind.…”

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Experimentelle Untersuchungen zum Einfluss des statischen Systems und der Belastungsart auf die Querkrafttragfähigkeit von Balken mit geringer Querkraftbewehrung

Tue¹,

Betschoga

Tung

2023

Beton und Stahlbetonbau

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Der vorliegende Aufsatz berichtet über experimentelle Untersuchungen zum Querkraftverhalten von Balken mit geringer Querkraftbewehrung unterschiedlicher statischer Systeme und Belastungen. Insgesamt wurden vier Einfeldbalken unter Einzellasten, zehn Kragbalken und drei simulierte Durchlaufbalken unter Gleichstreckenlasten getestet. Der Querkraftbewehrungsgrad wurde zwischen dem 0‐ (querkraftunbewehrt) und 2,0‐Fachen der Mindestquerkraftbewehrung nach EC2 variiert. Die Versuchsergebnisse zeigen einen erheblichen Einfluss des statischen Systems und der Belastungsart auf das Rissbild und die Traglast der untersuchten Balken. Während eine Querkraftbewehrung unterhalb der Mindestquerkraftbewehrung kaum Einfluss auf die Querkrafttragfähigkeit von Einfeldbalken unter Einzellasten hat, führt eine derart geringe Querkraftbewehrung bereits zu einer deutlichen Steigerung der Querkrafttragfähigkeit bei Balken unter Gleichstreckenlast. Im Vergleich zu Balken ohne Querkraftbewehrung bleibt das Rissbild jedoch unverändert, sodass das Versagen weiterhin durch einen einzelnen kritischen Schubriss gekennzeichnet wird. Ein Vergleich mit derzeit gültigen Berechnungs‐ bzw. Normvorschriften zeigt mögliche Verbesserungspotenziale in den angewendeten Modellen.

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Effect of Load Distribution and Variable Depth on Shear Resistance of Slender Beams without Stirrups

Cited by 10 publications

References 12 publications

Hybrid Fibres as Shear Reinforcement in High-Performance Concrete Beams with and without Openings

Hybrid Fibres as Shear Reinforcement in High-Performance Concrete Beams with and without Openings

Load-Bearing Performance of Non-Prismatic RC Beams Wrapped with Carbon FRP Composites

Experimentelle Untersuchungen zum Einfluss des statischen Systems und der Belastungsart auf die Querkrafttragfähigkeit von Balken mit geringer Querkraftbewehrung

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