Experimental study and finite element modelling of the torsional behavior of self-compacting reinforced concrete (SCRC) beams strengthened by GFRP

ELWakkad, Noha Yehia; Heiza, Khaled; Tayeh, Bassam A.; Mansour, Walid

doi:10.1016/j.cscm.2023.e02123

Cited by 14 publications

(8 citation statements)

References 49 publications

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“…The total potential energy of distortion consists of three parts: distortion warping strain energy, distortion frame strain energy, and external load potential energy [ 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 ]. This derivation follows the principle of minimum potential energy.…”

Section: Total Potential Energy Variational Methodsmentioning

confidence: 99%

Distortion Effect on the UHPC Box Girder with Vertical Webs: Theoretical Analysis and Case Study

Wang,

Wu,

Zhang

et al. 2024

Materials

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Distortion deformation usually imposes a potential threat to bridge safety. In order to comprehensively understand the distortion effect on thin-walled ultra-high performance concrete (UHPC) box girders, an innovative approach encompassing the governing distortion differential equation is introduced in this study based on the general definition of distortion angle within the cross-section plane. The analytical results obtained from the proposed method are in accordance with those obtained from the energy method, and exhibit favorable agreement with experimental findings documented in the existing literature. Furthermore, a finite element model is developed on the ANSYS 2021 R1 software platform with the employment of a Shell 63 element. Numerical outcomes are also in good agreement with the experimental data, affirming the validity and reliability of the findings. In addition, parameter analysis results indicate that the distortion angle remains approximately constant at a location approximately 1/10 of the span from the mid-span cross-section of the box girder, regardless of changes in the span-to-depth ratio. Increasing the web thickness yields a notable reduction in the distortion effects, and decreasing the wall thickness can effectively mitigate the distortion-induced transverse bending moment. Compared with normal-strength concrete box girders, UHPC box girders can reduce the distortion angle within the span range, which is beneficial for maintaining the overall stability of the box girders. The outcomes obtained from this study yield engineers an enhanced understanding of distortion effect on the UHPC girder performance.

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Section: Total Potential Energy Variational Methodsmentioning

confidence: 99%

Distortion Effect on the UHPC Box Girder with Vertical Webs: Theoretical Analysis and Case Study

Wang,

Wu,

Zhang

et al. 2024

Materials

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“…Several other researchers, studied the improvement of the torsional behaviour of strengthened RC members. The behaviour of FRP strengthened RC beams under pure torsion or combined shear and torsion was experimentally [9][10][11][12][13][14] and numerically [10,13,[14][15][16][17][18][19] investigated by several researchers.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of FRP strengthened reinforced concrete T-beams in torsion

Constantinos Β. Demakos,

Constantinos C. Repapis,

Dimitrios P. Drivas

et al. 2023

Global J. Eng. Technol. Adv.

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In general, reinforced concrete (RC) members are most commonly influenced by flexural moments, axial and shear forces. However, they may also be subject to torsional moments. Torsion in reinforced concrete (RC) beams is an important phenomenon that affects the structural behaviour of buildings. Both the concrete and steel reinforcement contribute to the torsional resistance of a RC member. However, the contribution of concrete is usually neglected by the modern design codes, due to cracking. Moreover, the subject of maintenance and repair or strengthening of existing RC structures is a significant problem. The last years, fibre reinforced polymer (FRP) is widely used as external reinforcement in flexural and shear strengthening. Nevertheless, its use in torsional strengthening is not so widely investigated. Ιn this paper, the torsional behaviour of RC T-beams reinforced in shear with FRPs is experimentally investigated. Five groups of T-beams subject to pure torsion, two of which are control beams and other three beams are strengthened in shear with U-jacketed FRP fabrics. Experimental results reveal that FRPs can increase the ultimate torsional capacity of the member.

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“…The behavior of FRP-enhanced RC beams could be understood when the assembly of membrane elements features extra equilibrium and compatibility conditions. Figure (1) shows the shear flow in the FRP-strengthened RC beam under an external force 'T', and Membrane element 'E' subjected to shear flow 'q.' Figure 1 FRP-Wrapped RC Beam under Torsion and Membrane Element E Few researchers previously studied the behavior of RC members strengthened using FRP under torsional strain.…”

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confidence: 99%

“…The study examines the effect of strengthening using CFRP on RC beams subjected to pure torsion with variable strips width, and different number of plies. For this purpose, the implementation of the numerical program is in alignment with the experimental parametric study [1]. When the numerical model achieved agreement with the results of the experimental program [1], the model was applied, but using CFRP instead of GFRP.…”

mentioning

confidence: 99%

“…For this purpose, the implementation of the numerical program is in alignment with the experimental parametric study [1]. When the numerical model achieved agreement with the results of the experimental program [1], the model was applied, but using CFRP instead of GFRP. Additionally, the numerical study adopted the same sample dimensions, steel reinforcement, number of FRP layers, and width of FRP strips of the parametric study, for the aim of comparing results.…”

mentioning

confidence: 99%

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Numerical study on the torsional behavior of CFRP-strengthened RC beams

Noha Yehia Elwakkad

2023

Global J. Eng. Technol. Adv.

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The present paper offers a numerical study on the behavior of reinforced concrete (RC) beams strengthened with carbon fiber reinforced polymer (CFRP) under pure torsional loading. The failure mode of RC beams significantly changed in accordance with torsional loading. Therefore, the effect of strengthening RC beams by CFRP under torsion is a vital area of study. This paper attempted to fill the gap by conducting a numerical (Abaqus) study, whereby the numerical investigation was in line with the parametric for a previous study of an experimental program. The numerical model achieved agreement with the results of the experimental program, then, this model was used by applying CFRP, instead of GFRP. Additionally, the numerical study was completely in line with the parametric study in terms of sample dimensions, steel reinforcement, number of FRP layers, and width of FRP strips, for the aim of comparing results. The comparative evaluation in this study aims to contrast the behavior of RC beams strengthened by CFRP with the behavior of those strengthened by GFRP under pure torsion. Parameters such as ultimate torsional moment, and the maximum angle of twist were studied. The study revealed that strengthening with CFRP improved the ultimate strength and post-cracking stiffness, in addition to localizing the damage.

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Experimental study and finite element modelling of the torsional behavior of self-compacting reinforced concrete (SCRC) beams strengthened by GFRP

Cited by 14 publications

References 49 publications

Distortion Effect on the UHPC Box Girder with Vertical Webs: Theoretical Analysis and Case Study

Distortion Effect on the UHPC Box Girder with Vertical Webs: Theoretical Analysis and Case Study

Experimental investigation of FRP strengthened reinforced concrete T-beams in torsion

Numerical study on the torsional behavior of CFRP-strengthened RC beams

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