Torsional Strengthening of RC Beams with Continuous Spiral Near-Surface Mounted Steel Wire Rope

Askandar, Nasih Habeeb; Mahmood, Abdulkareem Darweesh

doi:10.1186/s40069-019-0386-4

Cited by 19 publications

(11 citation statements)

References 38 publications

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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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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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“…Sometimes, the reinforced concrete structures are exposed to torsional moments, and the strength for torsion needs to be increased. Therefore, the ways for these member strengthening in torsion are necessary [2,3,4], to strengthen concrete (RC) structures, the strengthening materials can be applied in two main different manners: (1) externally bonded reinforcement (EBR), in which the strengthening materials are adapted externally to the concrete surface; and (2) near surface mounted (NSM), in which the strengthening materials are integrated into the concrete surface in pre-cut grooves (Askandar, N.H. and Mahmood, A.D.,2020) [5].…”

Section: Introductionmentioning

confidence: 99%

“…(Askandar, N.H. and Mahmood, A.D., 2020) [5] investigate the properties of RC beams subjected to the combined actions of torsion and bending moment when strengthened by spiral NSM steel wire rope in various configurations. The experimental study included cast and investigated six rectangular RC beams, one of these beams is considered as a control beam (without strengthening), while the others were reinforced with spiral NSM steel wire rope with a 45° spiral inclination.…”

Section: Introductionmentioning

confidence: 99%

Untitled

2023

Inf. Sci. Lett.

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In this paper, the torsional behavior of strengthened beams, which were subjected to constant and incremental repeated loads is studied. Repeated loads have a negative effect on the strength of beams as they reduce the beam's resistance to external loads. External strengthening is usually used to increase the strength of beams for different applied loading. The near-surface mounted technique is a type of strengthening recently used to improve the strength of beams. The experimental program includes testing of twelve beams. All beams have the same dimensions and the same reinforcement. Nine of those beams are strengthened with different configurations of steel wire rope, and three beams are non-strengthened (reference beams). The results show that the decreasing of the spacing between wires (increasing the amount of steel wires) leads to an increase in the beam torsion strength and a decrease in the twist angle of beams. All strengthened beams show high resistance to the repeated load, especially constant repeated load, the increased torsional capacity has reached to 181.12% in beams under constant repeated load compared to the related beam subjected to monotonic load.

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“…It enhances the shear capacity and reduces the construction cost [10]. Thus, it is found that few researchers use spiral stirrups rather than traditional vertical stirrups [11]. Since the shear failure mechanism is complex, the experimental test of beams underestimated the contribution of the stirrups but increased the contribution of the concrete component.…”

Section: Introductionmentioning

confidence: 99%

Improvement behavior of RC beams with continuous spiral stirrups under shear

Mohammed

Breesem

2022

QJES

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Reinforced concrete, RC beams subjected to shear failure which is the most unwanted failure mode due to speed progress is studied numerically. Therefore, the effective design of beams is necessary because of the sudden failure types of these beams in shear. The minimum shear reinforcement ratio of RC beams must be provided around the longitudinal rebars. Thus, the stirrups with different patterns have a significant benefit for improving the RC beam. In this paper, the performance of specimens with different spiral stirrups using ANSYS programs is investigated by comparing them with conventional stirrups of RC beams. One statement on the experimental results has been obtained from previous research Karayannis et al. [17]. The behaviors of these experimental beams are compared with finite element analysis of the identical beams. It is found that the behaviors of the experimental beam in comparison with the behaviors of the numerical beam are slightly different. Based on the FE analysis, the shear strength results demonstrated the mean accuracy and standard deviation of about 0.994 and 0.028, respectively, compared with the experimental test. Furthermore, the curve determined from FE analysis is consistent with the experiment data. The results give knowledge about the importance of spiral stirrups of the beam, and the most effective method among the investigated cases.

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Torsional Strengthening of RC Beams with Continuous Spiral Near-Surface Mounted Steel Wire Rope

Cited by 19 publications

References 38 publications

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

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

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Improvement behavior of RC beams with continuous spiral stirrups under shear

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