Finite element analysis of rectangular RC beams strengthened with FRP laminates under pure torsion

Majed, Muhanad M.; Allawi, Abbas A.

doi:10.1002/suco.202000291

Cited by 13 publications

(7 citation statements)

References 24 publications

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“…Consequently, the torsional strength of the strengthened beam increased by 48% compared to the control beam with an opening and approached that of the reference solid beam without an opening. RC beams reinforced with FRP were studied numerically under torsional failure using an FE computer program and then validated using experimental data from several earlier investigations [19]. It was concluded that completely wrapped beams with continuous FRP sheets exhibited torsional failure at higher levels very little torsional cracking and tensile rupture of the FRP laminate.…”

Section: Introductionmentioning

confidence: 98%

Torsional Improvement of RC Beams Using Various Strengthening Systems

El-Mandouh

Shim

et al. 2022

Buildings

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Many structural elements are subjected to a significant torsional moment that affects the structural design and may require strengthening. This paper presents different effective strengthening techniques to enhance the torsional capacity of reinforced concrete (RC) beams. An experimental and numerical investigation was undertaken to evaluate the efficacy of utilizing various strengthening systems. The experimental program included six full-scale RC beams with a cross-section dimension of (150 mm × 300 mm) and a length of 1500 mm, split into one beam without strengthening as a control beam, and six beams strengthened with various materials. The various strengthening materials were wrapped aluminum strips with anchorage bolts, wrapped stainless steel strips with anchorage bolts, wrapped glass fiber reinforcement polymer (GFRP), one layer of wrapped steel wire, and two layers of wrapped steel wire meshes along the beam. The results showed that the ultimate torque of the beam strengthened by wrapped aluminum strips and the beam strengthened by wrapped stainless steel strips was larger than the control beam by about 32% and 40%, respectively, because the strips acted as an external reinforcement. In addition to the strengthening systems, using aluminum strips and stainless steel strips is effective in raising the capacity to a similar degree despite the high cost of the stainless steel strips. The ultimate torque of the beams strengthened by GFRP, one-layered wrapped steel wire meshes, and two-layered wrapped steel wire meshes along the beam is larger than the control beam by about 62%, 118%, and 163%, respectively, in addition to the ultimate angle of twist, which was larger than the control beam by about 53%, 93%, and 126%, respectively. This showed that the strengthening using the two-layered wrapped steel wire meshes along the beam would be very significant in increasing the ultimate torque strength. Moreover, the strengthened beam by two-layered fully wrapped steel wire meshes along the beam developed the highest ductility factor compared to all strengthened beams; in contrast, the beam strengthened by GFRP had less ductility. To verify the outcomes of the experimental tests, a finite-element program, ABAQUS, was performed. Finally, an excellent agreement between the experimental and numerical results was obtained.

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Section: Introductionmentioning

confidence: 98%

Torsional Improvement of RC Beams Using Various Strengthening Systems

El-Mandouh

Shim

et al. 2022

Buildings

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“…In general, many researchers used the numerical analysis of the concrete structure that is necessary to validate the experimental data. Furthermore, the results established that the numerical behaviour of strengthened beams was in good agreement with the strengthened beams tested under torsion [16][17][18]. Meanwhile, Mahmood (2007) analysed the six RC beams under torsion with the ANSYS-V10 software [19].…”

Section: Introductionmentioning

confidence: 75%

Numerical Analysis of Torsional Reinforcement of Concrete Beams in Unconventional by ANSYS Software

Mohammed

Breesem²,

Hussein³

2023

Civ Eng J

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In this study, a finite element analysis is conducted to study the behaviour of RC beams with different configurations of transverse reinforcement under torsion. These configurations of stirrups are traditional closed stirrups, circular spiral stirrups, and inclined rectangular spiral stirrups. The numerical torsional load values are compared with the experimental torsional load values from previous research. The numerical analysis determined by the ANSYS software shows a reasonable agreement with the experimental torsional load values. The numerical results demonstrate that the use of continuous rectangular spiral stirrups improved the torsional response compared to using another type of beam stirrup. Thus, numerical results show that continuous spiral stirrups are effective at increasing torsional capacity. It is also noted that the behaviour of these beams with continuous spiral stirrups is better than the behaviour of the beams with traditional stirrups. The beams with helical reinforcement, which are TB2, TB3, and TB4 spiral reinforcements, greatly enhanced the toughness. The equivalent stresses are 13.709, 13.728, 14.72, and 15.894 MPa, while the equivalent elastic strains are 0.00421, 0.00377, 0.00347, and 0.00539 mm/mm for the beams TB2, TB3, and TB4, respectively. The beam TB4 had the highest stress and strain value, so its strength improved its ductility properties. As a result, the stirrups' configurations enabled the detection of beam failure mechanisms by improving torsional behaviour when compared to the beam's traditional stirrups. As a result, this research adds more knowledge to the literature on the most effective spiral stirrups for transverse reinforcement to improve the torsional behaviour of beams. Doi: 10.28991/CEJ-2023-09-01-04 Full Text: PDF

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Section: Introductionmentioning

confidence: 99%

“…Numerical investigations were conducted previously to understand the structural performance of RC multicell box girders (Chai et al, 2015;Hsu, 1991;Majed et al, 2021aMajed et al, , 2021b. The concrete damage plasticity constitutive model was used to simulate the damage in concrete due to torsion (Majed et al, 2021b). A new computational procedure based on the softened truss model to predict the torsional behavior of RC beams strengthened with FRP (Majed et al, 2021a).…”

Section: Introductionmentioning

confidence: 99%

Experimental and finite element analysis of reinforced concrete multi-cell box girders retrofitted with carbon fiber reinforced polymer strips under torsion

Allawi,

Chai,

Majeed

et al. 2023

Advances in Structural Engineering

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This study expands the state of the art in studies that assess torsional retrofit of reinforced concrete (RC) multi-cell box girders with carbon fiber reinforced polymer (CFRP) strips. The torsional behavior of non-damaged and pre-damaged RC multi-cell box girder specimens externally retrofitted by CFRP strips was investigated through a series of laboratory experiments. It was found that retrofitting the pre-damaged specimens with CFRP strips increased the ultimate torsional capacity by more than 50% as compared to the un-damaged specimens subjected to equivalent retrofitting. This indicated that the retrofit has been less effective for the girder specimen that did not develop distortion beforehand as a result of pre-loading. From experimental observations, when the girder specimen was cracked and the transverse steel reinforcement bars started straining, the CFRP strips started to work more effectively and contributed together with the transverse steel reinforcement to resist torsion load. Additionally, Finite Element (FE) simulations were developed using Abaqus to model the torsional behavior of the retrofitted girders, the results of which were validated with the experimental data. With the numerical model, the effect of concrete compressive strength, transverse reinforcement spacing, and CFRP strip spacing were examined. The effectiveness of the CFRP strips in enhancing the torsional strength of the girder was found to increase with increasing the spacing between the transverse reinforcement.

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Finite element analysis of rectangular RC beams strengthened with FRP laminates under pure torsion

Cited by 13 publications

References 24 publications

Torsional Improvement of RC Beams Using Various Strengthening Systems

Torsional Improvement of RC Beams Using Various Strengthening Systems

Numerical Analysis of Torsional Reinforcement of Concrete Beams in Unconventional by ANSYS Software

Experimental and finite element analysis of reinforced concrete multi-cell box girders retrofitted with carbon fiber reinforced polymer strips under torsion

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