Torsion strengthening of RC beams using CFRP (parametric study)

Elwan, Sherif

doi:10.1007/s12205-016-0156-7

Cited by 19 publications

(4 citation statements)

References 8 publications

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“…Moreover, it was stated that CFRP strengthening decreases the ductility of the beams, thus extra care should be taken with the number of CFRP layers to prevent brittle failure. A detailed parametric investigation was done to study the effect of CFRP strengthening different shapes and techniques on the torsional capacity of RC beams [17]. It was revealed that instead of employing CFRP strips, continuous wrapping conditions are significantly more successful at improving torsion strength.…”

Section: Introductionmentioning

confidence: 99%

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: 99%

Torsional Improvement of RC Beams Using Various Strengthening Systems

El-Mandouh

Shim

et al. 2022

Buildings

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“…ACS1, ACUJ-anc., ACW1, ACW2, BCS1, BCUJ-anc., BCW1, BCW2, CCW1, CCW2 [25] CW1(1), CW1(2), CW1(3), CW2, CUJ-anc, CS1, CS2 [26] WR1, WR2 [27] CFB1, CFB2, CFB3, CFB4, CFB5, CFB6, GFB1, GFB2, GFB3, GFB4, GFB5, GFB6 [28] BR2, BR3, BR4, BR5 [29] FT, FL, 100S100, CO&100S100, DS, CO&DS [30] CS1, CUJ-anc, CW1, CW2 [31]…”

Section: Sample Id Referencementioning

confidence: 99%

Torsional Strengthening of Reinforced Concrete Beams with Externally-Bonded Fibre Reinforced Polymer: An Energy Absorption Evaluation

et al. 2020

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The impacts of numerous important factors on the Energy Absorption (EA) of torsional Reinforced Concrete (RC) beams strengthened with external FRP is the main purpose and innovation of the current research. A total of 81 datasets were collected from previous studies, focused on the investigation of EA behaviour. The impact of nine different parameters on the Torsional EA of RC-beams was examined and evaluated, namely the concrete compressive strength (f’c), steel yield strength (fy), FRP thickness (tFRP), width-to-depth of the beam section (b/h), horizontal (ρh) and vertical (ρv) steel ratio, angle of twist (θu), ultimate torque (Tu), and FRP ultimate strength (fy-FRP). For the evaluation of the energy absorption capacity at different levels, Response Surface Methodology (RSM) was implemented in this study. Also, to fit the measured results, Quadratic and Line models were created. The results show that the RSM technique is a highly significant tool that can be applied not only to energy absorption-related problems examined in this research, but also to other engineering problems. An agreement is observed between Pareto and standardized charts with the literature showing that the EA capacity of the torsional FRP-RC beams is mostly affected by the concrete compressive strength, followed by the vertical reinforcement ratio. The newly suggested model in this article exhibits a satisfactory correlation co-efficient (R), of about 80%, with an adequate level of accuracy. The obtained results also reveal that the EA acts as a safety index for the FRP-strengthened RC beams exposed to torsional loadings to avoid sudden structural damage. Doi: 10.28991/cej-2020-SP(EMCE)-07 Full Text: PDF

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“…These various shapes create difficulty in understanding torsion in RC members (Panchacharam and Belarbi 2002). Elwan (2017) worked on flanged beams retrofitted with FRP system subjected to torsional moment. Though shear and torsion both produced diagonal cracks in RC beam, behavior of RC beam subjected to torsion is different.…”

Section: Torsional Strengthening Of Beamsmentioning

confidence: 99%

Study of torsional behavior of reinforced concrete beams strengthened with aramid fiber strips

Kandekar¹,

Talikoti

2018

Int J Adv Struct Eng

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This paper investigates the strengthening of reinforced concrete (RC) beams for its torsional behavior using aramid fiber strips. Most of the time aramid fiber is used as an externally bonded reinforcement to increase flexural and shear strength of RC beams. An attempt is made to use it for improving torsional moment carrying capacity of RC beam. Torsional failure mostly occurs in earthquake prone areas subjected to rapid failure. Brittle failure of structures occurs due to torsional moment. Different patterns of aramid fiber strips are selected to wrap around RC beams and torsional behavior of these strengthened beams is studied. RC beam of M30 grade of concrete is strengthened with aramid fiber strips and tested for torsional failure using lever arms subjected to torque. The beam size is 150 mm × 300 mm and of 1.3 m in length, designed as per IS456-2000. A total of 21 numbers of reinforced concrete rectangular beams were cast for the experimental study. Three are taken as controlled beams with normal reinforcement, 3 beams are designed with torsional reinforcement and other 15 beams with normal reinforcement have grouped in five sets. These five sets are strengthened using aramid fiber strips of 150 mm width with variable spacing of 100, 125, 150, 175 and 200 mm, respectively. The effect of different configuration of aramid fiber on torsional moment carrying capacity, angle of twist and failure mode of the beams is studied.

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Torsion strengthening of RC beams using CFRP (parametric study)

Cited by 19 publications

References 8 publications

Torsional Improvement of RC Beams Using Various Strengthening Systems

Torsional Improvement of RC Beams Using Various Strengthening Systems

Torsional Strengthening of Reinforced Concrete Beams with Externally-Bonded Fibre Reinforced Polymer: An Energy Absorption Evaluation

Study of torsional behavior of reinforced concrete beams strengthened with aramid fiber strips

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