Shear strength of reinforced concrete beams strengthened by P.B.O. fiber mesh under loading

Blikharskyy, Zinoviy; Khmil, Roman; Vegera, Pavlo

doi:10.1051/matecconf/201711602006

Cited by 23 publications

(8 citation statements)

References 2 publications

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“…fabric and mineral cement basement. For strengthening FRCM system are used, as stripes width 70 mm, with step 100 mm [Vegera P. et al 2017. ] (Fig.…”

Section: The Testing Programmentioning

confidence: 99%

Comparison Crack Resistance of RC Beams with and without Transverse Reinforcement after Shear Testing

Vegera

Khmil

Vashkevych

et al. 2019

Quality Production Improvement - QPI

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Main parameters, which characterize shear strength, are crack distribution, width of diagonal crack opening and angle of inclined crack. There are in this article, comparison crack resistant of testing reinforced concrete (RC) beams on the shear with such variable parameters like presence or absence internal reinforcement, different shear span, and presence or absence external composite reinforcement. Shear span (relative span to effective depth ratio) was acquired the following values: a/d=2, 1.5, 1. For internal reinforcement, rebar’s A240C with diameter 8 mm and steps 100 mm was chosen. The composite FRCM system was like external reinforcement with three stripe of composite fabric with width 70 mm and step 100 mm. Eight RC beams were tested. After testing, we discovered that the most influenced on the serviceability capacity was shear span. Internal transverse reinforcing increased shear strength on the same level and it was independent from shear span and other factors. Only quantity of reinforcing determine level of increasing shear capacity. FRCM system is efficient strengthening system, which significant increase shear crack resistant for RC beams. External FRCM reinforcing increase shear crack resistance on the same percentage and independent from presence or absence internal reinforcement.

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“…fabric and mineral cement basement. For strengthening FRCM system are used, as stripes width 70 mm, with step 100 mm [Vegera P. et al 2017. ] (Fig.…”

Section: The Testing Programmentioning

confidence: 99%

Comparison Crack Resistance of RC Beams with and without Transverse Reinforcement after Shear Testing

Vegera

Khmil

Vashkevych

et al. 2019

Quality Production Improvement - QPI

Self Cite

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“…For more details, experimental investigations of strengthened and unstrengthened RC beams on the shear are given in the articles [36,37].…”

Section: Experimental Datamentioning

confidence: 99%

A Calculation Model for Determining the Bearing Capacity of Strengthened Reinforced Concrete Beams on the Shear

et al. 2023

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This article presents research on the bearing capacity and methods of calculating reinforced concrete beams on the shear without internal shear reinforcement, which are strengthened with a composite FRCM system. The test samples were divided into two series: the first series—control, in which the variable parameter was the shear span (a/d = 2, a/d = 1.5, and a/d = 1); and the second series—reinforced by the FRCM system, without load, and strengthened at different load levels. The method of calculating experimental beams was tested according to the current code and data from the fib report. In this article, recommendations for determining the angle of inclined struts θ, the coefficient of the concrete shear strength CRd,c, and the coefficient of the load level at which strengthening is performed are proposed. The calculation with the these recommendations showed a good convergence of experimental and theoretical data in the 16–29% range, which is a much higher convergence than the calculation without these recommendations.

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“…Other design measures and materials are also used to strengthen inclined sections, including steel and non-metallic fiber [16,17], carbon cloths, reinforced concrete clips, etc. These techniques are also used to further increase the calculated strength of concrete of protective structures for stretching when they are strengthened but are not advisable in the construction of such structures.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Improving the crack resistance of inclined cross-sections of reinforced concrete containment shells in areas of emergency loads of pushing

Karkhut

2022

EEJET

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The object of this research was the crack resistance of inclined sections of concrete and reinforced concrete fragments of protective structures under the action of emergency dynamic loads. The characteristics of dangerous emergency dynamic loads on protective structures (seismic, aircraft attack), the experience of increasing the crack resistance of inclined sections with various materials and design measures under static effects have been described. Areas of influence of dynamic loads on reinforced concrete structures reinforced with horizontal grids near the upper and lower faces need to increase crack resistance and eliminate the risk of splitting in the mesh plane. Comparison of the results of experimental studies of inclined sections of protective structures in the area of influence of local emergency load showed the feasibility of such structural measures. Additional horizontal reinforcement near the pushing face increases crack resistance by 55–65 %. When using the developed theoretical dependences, the error in determining the cracking forces and pushing strength does not exceed 20.7 %. Increased crack resistance is ensured by limiting the maximum diameters of the rods of horizontal grids and their pitch. Especially important is the arrangement of additional reinforcement in the middle zone, taking into account the actual tensile strength of concrete in the calculated dependences. Complete elimination of the danger of splitting in areas of probable action of emergency dynamic load in protective structures in the planes of the grids is recommended through the use of concrete of class not lower than C16/20, the use of reinforcement Ø12–14 mm. The optimal pitch of the rods is 50–125 mm. This makes it possible to increase the reliability of the design and operation of protective structures in case of emergency impacts, to reduce the cost of their repair after such impacts.

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Shear strength of reinforced concrete beams strengthened by P.B.O. fiber mesh under loading

Cited by 23 publications

References 2 publications

Comparison Crack Resistance of RC Beams with and without Transverse Reinforcement after Shear Testing

Comparison Crack Resistance of RC Beams with and without Transverse Reinforcement after Shear Testing

A Calculation Model for Determining the Bearing Capacity of Strengthened Reinforced Concrete Beams on the Shear

Improving the crack resistance of inclined cross-sections of reinforced concrete containment shells in areas of emergency loads of pushing

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