Improving shear capacity of existing RC T-section beams using CFRP composites

Khalifa, Ayman M.; Nanni, Antonio

doi:10.1016/s0958-9465(99)00051-7

Cited by 335 publications

(118 citation statements)

References 2 publications

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“…Other major characteristics of FRP include its high strength to weight ratio, it has non-conductive, non-corrosive and nonmagnetic properties and is resistant to chemical attack [3,4]. It has also been reported by Alferjani et al [5], Ali et al [6] and Shahidan et al [7] that the application of the FRP composites has been proven to increase the service life contributing to the structures longevity.…”

Section: Introductionmentioning

confidence: 93%

Sustainable Shear Behaviour of 2-Span Continuous Reinforced Concrete T-Beams with CFRP Strips

et al. 2017

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Abstract. Reinforced concrete (RC) structures are generally subjected to various load conditions and are susceptible to environmental impact. With time, most of these structures will be subjected to change in their usage. Unexpected increase in load changes may cause severe damage to the structural components, and eventual leading to various types of structural failure. It is noted that shear failure in nature is a sudden failure and should be avoided at all times. To increase its service life due to shear, structures can be strengthened or repaired using CFRP strips wrapped within the shear span (a v ) of the beam. Hence, this paper presents an investigation on the sustainable behaviour of two span continuous RC T-beams strengthened and repaired by wrapping Carbon Fibre Reinforced Polymer (CFRP) strips at intervals along the shear span (a v ) of the beam. The CFRP strips will be orientated in two directions either at 0°/90° or 45°/35°. Five beams, one control beam, two initially strengthened beams and two precracked and repaired beams were cast and cured in room temperature before testing. All T-beams were designed to fail in shear and are subjected to four-point bending test until failure. Upon completion of the test, all beam specimens shows good sustainable behaviour as the ultimate load and shear load shows an increase in capacity by up to 23% with improve ductile behaviour.

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Section: Introductionmentioning

confidence: 93%

Sustainable Shear Behaviour of 2-Span Continuous Reinforced Concrete T-Beams with CFRP Strips

et al. 2017

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“…이에 다수의 탄소섬유보강 관련 연구 [1][2][3][4][5][6][7][8][9][10] 가 진행되었으며, 이를 바탕으로 실무 적용시 구조안정성을 확보하고 있다. 특히 탄소섬유와 모재 사이의 박리(debonding) 로 인해 보강성능이 결정되어 CFRP의 인장성능을 충분히 활 용하지 못하는 경우, 단부정착을 통해 박리 이후 정착부로 응력을 전달하여 보강성능을 증진하는 연구 [11][12][13][14][15] …”

Section: 서 론 1)unclassified

Evaluation of Shear Behavior of Beams Strengthened in Shear with Carbon Fiber Reinforced Polymer with Mohr's Circle

Kim¹

2016

Journal of the Korea Concrete Institute

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Beams strengthened in shear with Carbon Fiber Reinforced Polymer (CFRP) which had different transverse reinforcement ratio were tested to evaluate shear contribution in the CFRP and to analyze shear behavior of each test with Mohr's circle. Strain in the CFRP should be evaluated to estimate the shear contribution in the CFRP which is brittle material. Test results were compared each other based on the Mohr's circle which can correlate shear strain with both principal tensile strain and crack angle. With low transverse steel ratio, shear strengthening with CFRP not only increases the shear strength effectively but also minimizes the loss in shear contribution of concrete by limiting the development of crack. With high transverse steel ratio, the effect on shear strengthening with CFRP is not as much as the beam with low ratio. Therefore, the shear contribution in the CFRP should be evaluated based on the strain compatibility which can consider the interaction between steel and CFRP when determining the shear capacity of a strengthened member.

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“…In the study, the steel plates used for reinforcement and FRP plates were compared (Ali et al 2001). Khalifa and Nanni (2000) increased the shear strength of beams with a rectangular cross-section using GFRP plate in the study they performed. Diagana et al (2003) aimed at reinforcing rectangular beams with insufficient shear reinforcement against shear in the study they performed.…”

Section: Introductionmentioning

confidence: 99%

Effect of Anchorage Number on Behavior of Reinforced Concrete Beams Strengthened with Glass Fiber Plates

Kaya

Kankal

2015

International Journal of Concrete Structures and Materials

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Reinforced concrete beams with insufficient shear reinforcement were strengthened using glass fiber reinforced polymer (GFRP) plates. In the study, the effect of the number of bolts on the load capacity, energy dissipation, and stiffness of reinforced concrete beams were investigated by using anchor bolt of different numbers. Three strengthened with GFRP specimens, one flexural reference specimen designed in accordance to Regulation on Buildings Constructed in Disaster Areas rules, and one shear reinforcement insufficient reference specimen was tested. Anchorage was made on the surfaces of the beams in strengthened specimens using 2, 3 and 4 bolts respectively. All beams were tested under monotonic loads. Results obtained from the tests of strengthened concrete beams were compared with the result of good flexural reference specimen. The beam in which 4 bolts were used in adhering GFRP plates on beam surfaces carried approximately equal loads with the beam named as a flexural reference. The amount of energy dissipated by strengthened DE5 specimen was 96 % of the amount of energy dissipated by DE1 reference specimen. Strengthened DE5 specimen initial stiffness equal to DE1 reference specimen initial stiffness, but strengthened DE5 specimen yield stiffness about 4 % lower than DE1 reference specimen yield stiffness. Also, DE5 specimen exhibited ductile behavior and was fractured due to bending fracture. Upon the increase of the number of anchorages used in a strengthening collapsing manner of test specimens changed and load capacity and ductility thereof increased.

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Improving shear capacity of existing RC T-section beams using CFRP composites

Cited by 335 publications

References 2 publications

Sustainable Shear Behaviour of 2-Span Continuous Reinforced Concrete T-Beams with CFRP Strips

Sustainable Shear Behaviour of 2-Span Continuous Reinforced Concrete T-Beams with CFRP Strips

Evaluation of Shear Behavior of Beams Strengthened in Shear with Carbon Fiber Reinforced Polymer with Mohr's Circle

Effect of Anchorage Number on Behavior of Reinforced Concrete Beams Strengthened with Glass Fiber Plates

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