Torsional Improvement of RC Beams Using Various Strengthening Systems

El-Mandouh, Mahmoud A.; Hu, Jong Wan; Shim, Won Sup; Abdelazeem, Fathi; Elsamak, Galal

doi:10.3390/buildings12111776

Cited by 12 publications

(3 citation statements)

References 19 publications

(22 reference statements)

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“…The beams strengthened by GFRP, one-layered wrapped steel wire meshes, and two-layered wrapped steel wire meshes along the beam are 62%, 118%, and 163% stronger than the control beam; an ABAQUS finite-element program was used to validate the experimental test results. Finally, there was excellent agreement between the experimental and numerical results [9].…”

Section: Introductionsupporting

confidence: 63%

Finite element analysis of RC beams strengthened with near-surface mounted reinforcement bars under pure torsion

Ali,

Al-Azzawi

2023

IOP Conf. Ser.: Earth Environ. Sci.

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This study’s primary objective is to investigate the pure torsional behavior of reinforced concrete beams with inadequate resistance to applied loads. The beam needs to be strengthened with a simple and effective technique, the near-surface mounted. This paper was conducted to check the validity and accuracy of experimental results. This numerical study included testing three specimens; one was control beams, while the remaining were strengthened beams with two configurations with NSM closed and U-stirrups steel stirrups and longitudinal NSM bars. Each beam has three variables: Remove NSM longitudinal bars, use concrete’s compressive strength (20,60) MPa, and Strengthen with NSM GFRP and CFRP bars. All beams have a cross-section (300x300 mm), and the length of the beam was constant (2100 mm). The numerical analysis showed close results to those obtained from the experimental work. This convergence was evident in failure and ultimate torque patterns and mechanisms. The ultimate torque increased when strengthening with four faces of NSM closed stirrups and three faces of NSM stirrups (U-shape) at a spacing of 130mm. On the other hand, The increase in compressive strength leads to an increase in the ultimate torque. Lowering compressive strength leads to more ductile behavior with lower ultimate torque. Removing the additional longitudinal reinforcement has a minor effect on behavior. The type of bars, steel, CFRP, and GFRP, have a marginal impact on the behavior with more ductile behavior for the steel reinforcement bar beams.

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Section: Introductionsupporting

confidence: 63%

Finite element analysis of RC beams strengthened with near-surface mounted reinforcement bars under pure torsion

Ali,

Al-Azzawi

2023

IOP Conf. Ser.: Earth Environ. Sci.

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“…Based on the continuous technological development for several decades, several researchers were looking for materials for the development of concrete and reinforced concrete because it is considered one of the most important building materials [5][6][7]. Many materials have been used to strengthen concrete, including plastics, polymers, fiberglass, and other materials [9][10][11][12]. The shortage of fresh water in many countries of the world, including Jordan, due to industrialization in general manufacturing and processing concrete and reinforced concrete, which consumes one billion tons, made us look for new water resources to relieve pressure on freshwater resources [13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Torsional Strength of Reinforced Concrete Beams with Brine and Olive Oil Mill Wastewater

Al-Baijat

Alzgool

2023

Civ Eng J

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The authors conducted a comprehensive research study on adding olive oil mill and brine wastewater to the concrete mix to investigate torsion, bending stress, shear, and compressive strength. The total number of specimens were 33 beams 100 mm (depth) × 100 mm (width) × 500 mm (length). Three beams were used as control samples, and thirty beams were divided into two groups: fifteen samples were from an olive oil mill, and the other fifteen were brine wastewater with different percentages of additive material (olive oil mill and brine wastewater), with 2.5, 5.0, 7.5, 10.0, and 15.0 % of each. The beams were reinforced with 4 ϕ 8 mm as longitudinal steel bars and ϕ 4 mm stirrups spaced at 20 mm. All specimens were tested at 28 days. It was found that the torsional strength of the samples containing brine wastewater when added at the best percentage, which is 10%, was 5.46 MPa. As is the case when adding olive oil mill wastewater with the best percentage, which is 7.5%, it was 5.16 MPa. These data are greater than the torsional strength in the reference samples, which were 4.38 MPa, meaning that the torsional strength when adding brine wastewater and olive oil mill wastewater increases by 24% and 17%, respectively. Doi: 10.28991/CEJ-2023-09-03-012 Full Text: PDF

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“…Therefore, structural design must satisfy sufficient torsional strength. With respect to torsion, it is seen that experimental and numerical studies have been made for different structural elements [1][2][3][4][5]. Jeng et al [6] proposed cracking-torque formulas for hollow prestressed concrete beams based on experimental and theoretical results under torsion.…”

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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Torsional Improvement of RC Beams Using Various Strengthening Systems

Cited by 12 publications

References 19 publications

Finite element analysis of RC beams strengthened with near-surface mounted reinforcement bars under pure torsion

Finite element analysis of RC beams strengthened with near-surface mounted reinforcement bars under pure torsion

Torsional Strength of Reinforced Concrete Beams with Brine and Olive Oil Mill Wastewater

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

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