Experimental and Numerical Nonlinear Analysis of Hollow RC Beams Reinforced with Rectangular Spiral Stirrups under Torsion

Ibrahim, Ahmed; Askar, Hamed S.; El-Zoughiby, Mohamed E.

doi:10.1007/s40996-022-00852-7

Cited by 2 publications

(2 citation statements)

References 12 publications

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“…A numerical equation had also been created to estimate the torsional capacity of these kinds of beams. Furthermore, the comparison of numerical and experimental outcomes was highly satisfactory, and the recommended equation strongly corresponds with both experimental and numerical results [8]. Hussain et al (2022), investigated the fibres performance by examining twelve HSC beams under torsion load.…”

Section: Introductionmentioning

confidence: 61%

Enhanced Torsion Mechanism of Small-Scale Reinforced Concrete Beams with Spiral Transverse Reinforcement

Mahmoud

Mohammed²,

Salem³

2022

Civ Eng J

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The nonlinear torsional behaviour of small-scale reinforced concrete (RC) beams with continuous staggered spiral as transverse reinforcement stirrups is experimentally investigated. Twelve miniatures RC beams were tested under torsion load considering the closed shape of stirrups and compared with continuous staggered spiral ones. All miniatures beams were scaled down to be one-eighth the prototype beam size. The main parameters considered in this research are stirrup spacing and its configurations. Small scale RC beams were taken into account in the existing study because of their construction simplicity and financial feasibility. Mortar without coarse aggregate was applied instead of concrete to reduce the size effect of applying small scale models. Ongoing research trials have been carried out to obtain an efficacious approach to boost torsion failure mechanisms because brittle torsion failure of RC structural elements should be avoided. This study emphasized boosted torsion capacity, dissipated energy, and helical crack propagation. During testing, the primary cracking torsion moment, ultimate torsion moment, peak twist angle, and failure mechanism of the beams were inspected. The use of spiral stirrups showed great enhancement of the torsional behaviour of samples. It was observed that using spiral stirrups rather than closed stirrups could result in a substantial increase in torsion capacity and dissipated energy of 87.7% and 89.8%, respectively. As a result, the predicted capacities of the RC beams prototype were estimated in detail, taking account the scale down factor implemented by the authors. Values obtained based on international specifications and guidelines were used to compare the experimental results. Doi: 10.28991/CEJ-2022-08-11-019 Full Text: PDF

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Section: Introductionmentioning

confidence: 61%

Enhanced Torsion Mechanism of Small-Scale Reinforced Concrete Beams with Spiral Transverse Reinforcement

Mahmoud

Mohammed²,

Salem³

2022

Civ Eng J

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“…Conventional shear reinforcement, which functions to withstand bending moment loads, is converted into spiral reinforcement installed continuously on the axis of the concrete block and acts as reinforcement to withstand shear forces. Research related to spiral reinforcement is described by Ibrahim et al [21], Askandar and Mahmood [22], Ibrahim et al [23], and Al-Faqra et al [24]. The change of vertical shear reinforcement into spiral shear reinforcement in beams is considered to increase the flexural capacity; according to Shatarat et al [25], the shear capacity of SCC beams reinforced with rectangular spiral reinforcement is higher than traditional shear reinforcement regardless of the distance and angle of inclination for the stirrups.…”

Section: Figure 1 Compression-tension Of a Flexural Beam Figure 2 Rec...mentioning

confidence: 99%

Performance Flexural of RC Beams Without Concrete at Tension Cross-section

Amir

Rahman²,

Opirina³

et al. 2022

Civ Eng J

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This study aims to analyze the flexural capacity of RC without concrete in a tension cross-section using an experimental method. The number of specimens is three pieces, namely a spiral reinforced concrete beam (SBC) and a vertical reinforced concrete beam (CBN); both of these blocks are without concrete in the cross-section of the reinforcement and 60D tensile steel reinforcement in the support area, where D is the primary diameter, and a conventional concrete beam as the control beam (CB). The beam size is 3100×150×200 mm. The beams are supported by simple supports with a span of 3000 mm. The concrete in the structural beam elements, which work optimally to withstand the load, is the outermost fibre part of the side, while the concrete on the tension side does not have a direct role in determining the magnitude of the resisting moment. Therefore, the quality of the concrete in the concrete beam section must be optimized, while the concrete in the tension section must be minimized. Eliminating concrete in tension areas reduces the construction's self-weight and use of concrete-making materials. The main variables in this research are bending behaviour and crack pattern. The beam specimens were tested with two-point loading monotonically. By observing the crack pattern and failure mode, the results showed an increase in the capacity load of SBC by 21.58% CBN but a decrease of 27.57% compared to the CB control beam. Flexural cracks and beam failures resembled under-reinforcing. The flexural capacity was analyzed based on static analysis and then validated by calculating the ratio between the theoretical nominal moment and the experimental moment. This finding shows that changing the conventional shear reinforcement model to spiral can increase the flexural of the beam without concrete in the tension cross-section. Doi: 10.28991/CEJ-2022-08-11-014 Full Text: PDF

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Experimental and Numerical Nonlinear Analysis of Hollow RC Beams Reinforced with Rectangular Spiral Stirrups under Torsion

Cited by 2 publications

References 12 publications

Enhanced Torsion Mechanism of Small-Scale Reinforced Concrete Beams with Spiral Transverse Reinforcement

Enhanced Torsion Mechanism of Small-Scale Reinforced Concrete Beams with Spiral Transverse Reinforcement

Performance Flexural of RC Beams Without Concrete at Tension Cross-section

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