Torsion in concrete beams reinforced with GFRP spirals

Hadhood, Abdeldayem; Gouda, Mohammed Gamal; Agamy, Mohamed H.; Mohamed, Hamdy M.; Sherif, Alaa G.

doi:10.1016/j.engstruct.2020.110174

Cited by 30 publications

(10 citation statements)

References 22 publications

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“…The validity of the proposed model is confirmed by comparing its results with experimental results from the test carried out by Hadhood et al [18] and by Le DD et al [25].…”

Section: Model Validationmentioning

confidence: 54%

“…After cracking, tensile stress is transferred from concrete to stirrup, while compressive stress in the concrete cover is transferred to the corners. The use of FRP materials, which have higher tensile strength than conventional steel, can increase torsional strength by up to 150% [17,18]. However, due to the materials properties of FRP, some researchers have reported a significant reduction in the tensile strength of composite stirrup in areas with complex stress states, such as the corner of cross-section [22].…”

Section: Modelling Discussionmentioning

confidence: 99%

“…Examples of such models include the models of Chalioris [13], Ameli et al [14], Deifalla & Gobarah [15] or Alabdulhady et al [16]. The torsional responses of RC elements with FRP reinforcement have also received attention from researchers, but only through analytical approaches, such as in the models developed recently by Deifalla et al [17] or Hadhood et al [18]. To the best of the authors' knowledge, there is currently no sectional-fiber finite element model capable of predicting the torsional behavior of RC beams using FRP bars.…”

Section: Introductionmentioning

confidence: 99%

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Development of multi-fiber approach finite element model for reinforced concrete beam using frp reinforcements under pure torsion

Nguyen Tuan,

Le Dang,

Nguyen Xuan

2023

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A finite element model using a multi-fiber approach is proposed in this paper for the analysis of reinforced concrete (RC) members using fiber-reinforced polymer (FRP) reinforcements, with a specific focus on the effect of pure torsion. The proposed model is formulated using a displacement-based approach and a kinematic assumption involving a two-node Timoshenko beam. The compatibility and equilibrium between concrete and FRP materials in the membrane elements are formulated based on a discretization of the cross-section into several areas following its stress state and the principle of the Modified Compression Field Theory. The nonlinear responses of RC elements with FRP bars can be predicted using an appropriate constitutive material law with internal equilibrium of transverse reinforcement and concrete. The pure torsional response is implemented using an enhanced formulation of concrete's tensile behavior, which is based on experimental tests on torsion and the characteristics of FRP materials. The good agreement between the numerical results and experimental data confirms the validity of the proposed model

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“…The validity of the proposed model is confirmed by comparing its results with experimental results from the test carried out by Hadhood et al [18] and by Le DD et al [25].…”

Section: Model Validationmentioning

confidence: 54%

Section: Modelling Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Development of multi-fiber approach finite element model for reinforced concrete beam using frp reinforcements under pure torsion

Nguyen Tuan,

Le Dang,

Nguyen Xuan

2023

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“…In addition, Jariwala et al [32] experimentally investigated the impact of GFRP reinforcements with different combinations, and the maximum torsional capacity of steel beams increased up to 117%. In contrast, Hadhoo et al [33] conducted torsion tests on concrete beams reinforced with GFRP spiral rebars at different angles, and new equations are recommended for the design. Moreover, axial pressure and torsion tests were carried out on concrete-filled CFRP-steel tubes where the carbon FRP layer confines the steel tube externally, providing additional corrosion resistance.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Steel I-Beams Strengthened Using CFRP and BFRP Sheets under Torsion

Aydın

2023

Advances in Civil Engineering

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Torsional demand acting on beams can significantly effect structural behavior and cause high-local stresses. The torsional resistance of beams can be potentially increased by using fiber-reinforced polymer (FRP) sheets. In this study, basalt (BFRP) and carbon (CFRP) fabrics with different layouts are used to strength the steel I-beams, and the enhancement in the torsional strength is investigated experimentally and numerically. First, 12 specimens are reinforced using BFRP and CFRP fabrics bonded to the web of steel I-beams in three different layouts to carry out the experimental study. In total, 14 specimens are tested under torsion including two reference beams. Second, a numerical model is developed to capture the torsional behavior of web-reinforced steel beams. After the numerical model is verified satisfactorily, a parametric study is conducted to evaluate the effect of FRP strengthening on steel beams for flange-only and full reinforcement alternatives. In the experiments, fully web-bonded FRP strengthening configuration achieved 18% and 14% increase in torsional capacities for BFRP and CFRP sheets compared to reference, respectively. In last, it is discovered by the parametric study that the full reinforcement using FRP on the web and flanges can achieve up to 43% increase.

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“…Kandekar and Talikoti [12] evaluated the effectiveness of the use of aramid fiber as an externally bonded reinforcement by testing a total of 12 RC rectangular beams under torsional moment. Hadhood et al [13] evaluated the effectiveness of using GFRP rectangular spirals and rectilinear stirrups to reinforce concrete beams in the transverse direction under pure torsion t…”

Section: Introductionmentioning

confidence: 99%

Behavior of Reinforced Concrete Beams Strengthened By GFRP Composites Subjected to Combined Bending and Torsion – Experimental Study

Othman

Meleka

Heiza

et al. 2021

ERJ. Engineering Research Journal

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This paper presents an experimental investigation on the behavior of reinforced concrete beams subjected to combined bending and torsion, strengthened by using externally bonded glass fiber reinforced polymer (GFRP). The experimental work includes investigation of three RC beams tested under combined bending and torsion. One beam is kept without strengthening as a control specimen, while the other two beams are strengthened using GFRP wrapping with different configurations. All RC beams have the same concrete grade and steel reinforcement. The strengthened beams in the experimental study include full wrapping with continuous GFRP sheets and discrete GFRP strips with the same GFRP reinforcement ratio. The load-mid span deflection curves and the torsional moment-twist angle curves were recorded to failure. The crack patterns and failure modes of the RC beams were also indicated. The Experimental results reveal that strengthening by using GFRP wrapping helped effectively in improving the overall performance of the strengthened beams.

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Torsion in concrete beams reinforced with GFRP spirals

Cited by 30 publications

References 22 publications

Development of multi-fiber approach finite element model for reinforced concrete beam using frp reinforcements under pure torsion

Development of multi-fiber approach finite element model for reinforced concrete beam using frp reinforcements under pure torsion

Investigation of Steel I-Beams Strengthened Using CFRP and BFRP Sheets under Torsion

Behavior of Reinforced Concrete Beams Strengthened By GFRP Composites Subjected to Combined Bending and Torsion – Experimental Study

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