Effects of CFRP retrofit on impact response of shear-deficient scaled reinforced concrete beams

Shafei, Erfan; Kabir, Mohammad Zaman

doi:10.1590/1679-78251290

Cited by 10 publications

(3 citation statements)

References 9 publications

(11 reference statements)

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“…Some researchers [ 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 ] found that strengthening with carbon-fiber-reinforced polymer (CFRP) composite wraps could improve the shear impact resistance of RC beams, prevent the development and expansion of shear cracks, and eventually restrict the shear damage. Suter et al [ 15 ] found earlier that wrapping RC columns transversely with aromatic fiber (Kevlar) composites could significantly enhance the shear impact resistance of columns.…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis on Dynamic Response of CFRP-Wrapped RC Columns under Lateral Impact Loading

Liu

Chen

et al. 2023

Materials

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This paper presents a numerical study examining the dynamic response and resistance mechanism of reinforced concrete (RC) columns strengthened with or without carbon-fiber-reinforced polymer (CFRP) wraps under lateral impact loading by using the software LS-DYNA. First, the information of eight column models was briefly introduced as part of the laboratory experimental program from the literature. Secondly, finite element (FE) models were established in terms of the geometries of impact tests. Then, a detailed comparison between numerical results and experimental results was made, and FE models showed a relatively high simulation accuracy. Subsequently, a series of parametric analyses were carried out with a focus on the effects of axial compression ratio, the boundary condition at the column top, the layer number of CFRP wraps, and the impact velocity and impact height on the dynamic responses of plain and strengthened columns. The results demonstrated that the CFRP retrofit mechanism was not activated during the initial Stage-I when the impact force rapidly increased to the first peak and then decreased to zero. CFRP strengthening came into play in the second stage, Stage-II, and affected the response of the shear force and moment along the column height, as well as had a great influence on the control of shear damage. The dynamic response of RC columns was more sensitive to the impact velocity than to other parameters, regardless of whether CFRP wrapping was applied. The axial compression ratio would have a different influence on the column failure mode if the impact velocity was varied. The variation in impact height and boundary condition at the column top had little influence on the damage mode of strengthened columns.

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Section: Introductionmentioning

confidence: 99%

Numerical Analysis on Dynamic Response of CFRP-Wrapped RC Columns under Lateral Impact Loading

Liu

Chen

et al. 2023

Materials

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“…Almost all the studies indicate that it is very promising to utilize FRP sheets in strengthening concrete components. However, very limited literature investigates the dynamic response of FRP-shear-strengthened RC specimens under impact loads (Soleimani et al) [6][7][8][9]. Shafei and Kabir carried out a drop-hammer test on shear-strengthened RC beams with two kinds of FRP sheets, that is, unidirectional fiber and cross-fiber FRP [7].…”

Section: Introductionmentioning

confidence: 99%

“…However, very limited literature investigates the dynamic response of FRP-shear-strengthened RC specimens under impact loads (Soleimani et al) [6][7][8][9]. Shafei and Kabir carried out a drop-hammer test on shear-strengthened RC beams with two kinds of FRP sheets, that is, unidirectional fiber and cross-fiber FRP [7]. e results show that both FRP sheets can reduce the deflection of the members, restrain the development of shear cracks, reduce the degree of damage, and increase the energy absorption capacity of the members.…”

Section: Introductionmentioning

confidence: 99%

Effect of CFRP Shear Strengthening on the Flexural Performance of the RC Specimen under Unequal Impact Loading

Liu

Al-Bukhaiti

Abas

et al. 2020

Advances in Materials Science and Engineering

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Strengthening with externally bonded CFRP reinforcement is widely used in structural reinforcement and attractive to stakeholders and engineers because of ease and speed of construction, corrosion resistance, lightweight, high strength, and versatility stiffness which can be oriented according to the need. Numerous research studies were carried out to explore RC beams’ flexural and shear performance when subjected to dynamic impact loading. The results were auspicious in using such a technique of strengthening. Regular square section reinforced concrete frame members strengthened by CFRP material is taken as the research object. However, little attention to the impact behavior of CFRP-shear-strengthened square reinforced concrete (RC) specimens has been paid. The dynamic response of CFRP to reinforced concrete members under unequal cross-impact is discussed. This paper investigates the effectiveness of CFRP strengthening on the square RC specimen in preventing shear failure and evaluation of the flexural performance of the strengthened specimen under the impact load. The drop hammer impact test is firstly conducted on RC specimens with and without CFRP strengthening. The results show that using CFRP to strengthen the RC specimen in shear is very effective at preventing shear failure and leading the specimen’s response to flexural domination. This result is also the motivation for developing a numerical model supported by experimental tests to study the flexural performance of strengthened RC specimens. It is found that the strengthened specimen is prone to exhibit pure bending deformation under the impact load in terms of dynamic amplification factor (DAF) for section moment. Then, an extensive parameter study is carried out to evaluate further the influence of impact velocity, reinforcement ratio, and concrete strength on the flexural performance of the strengthened specimen and CFRP layers. Such a holistic study may provide preliminary research regarding the use of CFRP to strengthen RC specimens in shear under impact loads and will enhance the current state of knowledge in this area; also, the optimal value of the CFRP reinforcement layer was proposed.

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CFRP Strengthened Reinforce Concrete Square Elements Under Unequal Lateral Impact Load

Al-Bukhaiti

Liu

Zhao

et al. 2021

Lecture Notes in Civil Engineering

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Effects of CFRP retrofit on impact response of shear-deficient scaled reinforced concrete beams

Cited by 10 publications

References 9 publications

Numerical Analysis on Dynamic Response of CFRP-Wrapped RC Columns under Lateral Impact Loading

Numerical Analysis on Dynamic Response of CFRP-Wrapped RC Columns under Lateral Impact Loading

Effect of CFRP Shear Strengthening on the Flexural Performance of the RC Specimen under Unequal Impact Loading

CFRP Strengthened Reinforce Concrete Square Elements Under Unequal Lateral Impact Load

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