Experimental investigation on behavior of FRP-strengthened RC beams subjected to combined twisting-bending moments

Ilkhani, M.H.; Naderpour, Hosein; Kheyroddin, Ali

doi:10.1016/j.engstruct.2021.112617

Cited by 16 publications

(4 citation statements)

References 15 publications

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“…It has advantages such as lightweight, high tensile strength, and corrosion resistance. Consequently, it is being used for retrofit not only in columns [10][11][12][13] but also in beam-column joints [14][15][16], beams [17][18][19], and even bridge piers [20][21][22]. However, to achieve optimal performance in column retrofits, it is necessary to wrap all sides with fiber sheets.…”

Section: Introductionmentioning

confidence: 99%

Strengthening damaged columns on the soft first story of reinforced concrete building using ultra-high-strength fiber-reinforced concrete panels

Lim,

Tani,

Watanabe

et al. 2024

BNZSEE

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In this study, ultra-high-strength fiber-reinforced concrete (UFC) panels were used as a quick and effective measure for seismic strengthening of damaged reinforced concrete (RC) columns. Four 1/3-scale specimens, which replicated RC columns of the soft-first-story of a 10-story condominium building that was heavily damaged in the 2016 Kumamoto Earthquake, were constructed and tested. The specimens were strengthened using UFC panels after being preloaded to the drift ratio, at which the maximum load capacity of the target column was measured, and then subjected to the main loading until the ultimate state was reached. The UFC panels were installed on the two faces of the column in a direction parallel to the assumed loading direction. Two of the specimens had a UFC or RC wing wall attached to one side of the column, which was also aligned with the assumed loading direction. During the preloading and main loading, the specimens were subjected to a cyclic lateral load and varying axial load that simulated an earthquake load. The proposed method improved the maximum strength and ultimate drift ratio, and helped restore the initial stiffness of specimens with UFC panels and a wing wall to that of a column specimen during preloading. The test results of a previous study, wherein the target column, loading method, and strengthening method were the same but the specimens were not damaged before strengthening, were compared to study the impact of the damage on the RC column before strengthening.

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Section: Introductionmentioning

confidence: 99%

Strengthening damaged columns on the soft first story of reinforced concrete building using ultra-high-strength fiber-reinforced concrete panels

Lim,

Tani,

Watanabe

et al. 2024

BNZSEE

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“…Several other researchers, studied the improvement of the torsional behaviour of strengthened RC members. The behaviour of FRP strengthened RC beams under pure torsion or combined shear and torsion was experimentally [9][10][11][12][13][14] and numerically [10,13,[14][15][16][17][18][19] investigated by several researchers.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of FRP strengthened reinforced concrete T-beams in torsion

Constantinos Β. Demakos,

Constantinos C. Repapis,

Dimitrios P. Drivas

et al. 2023

Global J. Eng. Technol. Adv.

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In general, reinforced concrete (RC) members are most commonly influenced by flexural moments, axial and shear forces. However, they may also be subject to torsional moments. Torsion in reinforced concrete (RC) beams is an important phenomenon that affects the structural behaviour of buildings. Both the concrete and steel reinforcement contribute to the torsional resistance of a RC member. However, the contribution of concrete is usually neglected by the modern design codes, due to cracking. Moreover, the subject of maintenance and repair or strengthening of existing RC structures is a significant problem. The last years, fibre reinforced polymer (FRP) is widely used as external reinforcement in flexural and shear strengthening. Nevertheless, its use in torsional strengthening is not so widely investigated. Ιn this paper, the torsional behaviour of RC T-beams reinforced in shear with FRPs is experimentally investigated. Five groups of T-beams subject to pure torsion, two of which are control beams and other three beams are strengthened in shear with U-jacketed FRP fabrics. Experimental results reveal that FRPs can increase the ultimate torsional capacity of the member.

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“…Their method provides self-anchorage and does not require additional anchorage. Ilkhani et al [25] experimentally examined CFRP-strengthened RC beams bendingtorsion loading. Their findings indicated that CFRP plate use increases torsion capacity at the beam edges and delayes crack formation time.…”

Section: Introductionmentioning

confidence: 99%

Examination of parameters impacting flexural and shear strengthening of RC beams

Uzdil¹,

Sayın²,

Çoşgun³

2022

JSEAM

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Structural performance of reinforced concrete (RC) structures should be improved due to new design standards, strength reduction, and/or functional changes throughout their service life. To reach a sufficient level of structural performance, the following two options can be considered: reconstruction or strengthening of structures. Although reconstruction has some advantages in terms of using current technological developments, this option can lead to some negative consequences such as interruption of the building's service life, relatively high cost, and sustainability issues. Therefore, strengthening an existing structure mostly stands out as the first choice. The techniques used in strengthening applications can be grouped into two different methods: traditional (addition of new structural members) and non-conventional (seismic base isolation, local retrofitting, and jacketing). Among innovative methods, the fibre-reinforced polymer strengthening method attracts attention due to several advantages including practical applicability, as well as shear and bending capacity increase. Its application to the outer surface of structural members using resin reduces deterioration. Plus, fibres oriented in various directions spread stresses in different directions, therefore, provide effective force distribution. In this study, the effect of carbon fibre reinforced polymer (CFRP) orientation and RC material properties in the strengthening RC beams were investigated using MATLAB software. Accordingly, all stages of the design process are presented for RC beam strengthening considering both flexural and shear effects based on the American Concrete Institute (ACI) 440.2R standard. Through compiling MATLAB code, calculation time reduces, and material characteristics can be obtained more accurately. Plus, using curves obtained by MATLAB coding, shear and bending capacity increases can be observed. According to our findings, the application of one-layer CFRP plate to an RC beam increases the bending capacity by 50.6% and shear capacity by 33.6%. However, as the number of layers increases, the capacity increase rate reduces.

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Experimental investigation on behavior of FRP-strengthened RC beams subjected to combined twisting-bending moments

Cited by 16 publications

References 15 publications

Strengthening damaged columns on the soft first story of reinforced concrete building using ultra-high-strength fiber-reinforced concrete panels

Strengthening damaged columns on the soft first story of reinforced concrete building using ultra-high-strength fiber-reinforced concrete panels

Experimental investigation of FRP strengthened reinforced concrete T-beams in torsion

Examination of parameters impacting flexural and shear strengthening of RC beams

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