Tests on reinforced concrete beams strengthened in shear using near surface mounted CFRP and steel bars

Rahal, Khaldoun N.; Rumaih, Hatem A.

doi:10.1016/j.engstruct.2010.09.017

Cited by 79 publications

(59 citation statements)

References 7 publications

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“…Moreover, FRP expresses less ductile behavior. On the other hand, steel bar is less expensive, readily available in the market and their long-term durability and bond performance has been thoroughly researched (Rahal & Rumaih, 2011). And, it's also shows sufficient ductility.…”

Section: State Of the Artmentioning

confidence: 99%

Effect of adhesive replacement with cement mortar on NSM strengthened RC Beam

Rahman

Jumat

Hosen

et al. 2016

Revista de la Construcción

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This paper presents the experimental behavior of reinforcement concrete beams strengthened with near surface mounted (NSM) steel bar. Several researchers have used NSM fiber reinforced polymer (FPR) bar or strip for strengthening reinforced concrete beams. Though FRP has a number advantages like high strength, light weight and corrosion resistance it doesn't show any ductile behavior, still highly expensive and not easily available in market. On the other hand, steel bar is less expensive, readily available in the market and shows good ductility. In order to get rapid and economic strengthening solution, strengthening with near surface mounted steel bar may become a potential alternative to retrofit reinforced concrete members. Therefore, the main purpose of this paper to investigate the experimental behavior of reinforced concrete beam strengthened with near surface mounted steel bar. Seven full-size beams (one control beams and six strengthened beams) were tested. Steel bars were used for strengthening. The failure load, mode of failure, deflection, and strain behavior are discussed. The study reveals that the near surface mounted technique with steel bars and cement mortar is the most economical strengthening solution to increase the flexural performance of RC beams.Keyword: Strengthening, Near surface mounting, Steel bar, Reinforced concrete, Low cost strengthening materials, Cement mortar. ResúmenEn este trabajo se presenta el comportamiento experimental con mortero de cemento en Viga NSM de Hormigon Reforzado fortalecida. Varios investigadores han utilizado barra o tiras de NSM (montaje cercano a la superficie) de FRP (polímero reforzado con fibra) para el fortalecimiento de vigas de hormigón armado. Aunque FRP tiene un número de ventajas como alta resistencia, ligereza y resistencia a la corrosión, no muestra ningún comportamiento dúctil, siendo muy caros y no están fácilmente disponibles en el mercado. Por otro lado, la barra de acero es menos costosa, fácilmente disponible en el mercado y muestra una buena ductilidad. Con el fin de obtener una solución rápida y económica, el fortalecimiento con barra de acero NSM puede llegar a ser una alternativa potencial para adaptar los miembros de hormigón armado. Por lo tanto, el objetivo principal de este trabajo para investigar el comportamiento experimental de las vigas de hormigón armado reforzado con barras de acero NSM. Se ensayaron siete vigas de tamaño completo (una viga de control y seis vigas reforzadas). Barras de acero se utilizaron para el fortalecimiento. La carga de rotura, modo de fallo, deformación, y el comportamiento de tensión se discuten. El estudio revela que la técnica NSM con barras de acero y mortero de cemento es la solución de fortalecimiento más económica para aumentar el rendimiento de flexión de vigas RC.

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Section: State Of the Artmentioning

confidence: 99%

Effect of adhesive replacement with cement mortar on NSM strengthened RC Beam

Rahman

Jumat

Hosen

et al. 2016

Revista de la Construcción

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“…Many studies have applied the NSM FRP strengthening method to improve the flexural and shear strength of RC beams [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22], whilst others have used conventional steel bars instead of FRP materials for flexural and shear strengthening [21][22][23][24][25][26][27][28]. However, only few of these studies have focused on torsion strengthening [29][30][31]32] and no previous work has investigated the application of conventional steel bars for the torsion strengthening of RC beams.…”

Section: Introductionmentioning

confidence: 99%

Torsional Strengthening of RC Beams with Near‐Surface Mounted Steel Bars

Askandar

Mahmood

2020

Advances in Materials Science and Engineering

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e strength of reinforced concrete members can be enhanced by using the externally bonded reinforcement (EBR) and nearsurface mounted (NSM) methods. However, very few studies have adopted the NSM method for torsional strengthening. Although previous studies have reported the efficacy of using epoxy-resin-bonded NSM steel bars in increasing the flexural and shear strength of RC beams, no study has examined the use of steel bars and epoxy adhesives for torsional strengthening.erefore, this study investigates the behaviour of RC beams subjected to the combined actions of torsion and bending moment when they are strengthened with NSM steel bars (Ø10 mm) in different configurations. e practical part of this investigation consisted of seven cast and tested beams of 150 × 250 × 2000 mm dimensions. One beam was reference, which is not strengthened; meanwhile, all the other beams were strengthened with two U-shape-welded NSM steel bars. During the testing process, the twist angle at the torque intervals, first cracking torque, ultimate torque, and ultimate twist angle of the conventional beam were compared with those of the strengthened beams. e torsional performance of the RC beams was significantly improved by using NSM steel bars, whereas in various NSM configurations, the 90°NSM beams outperformed the 45°NSM beams.

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“…In these studies, concrete strength, flexural reinforcement ratio, sectional geometry, shear span‐to‐depth ratio a / d , type of loading, strengthening methodology, strengthening material and amount and configuration of strengthening composite were investigated as test variables. FRP material is generally applied either through wet lay‐up sheets or strips bonded to the external faces of the member [10, 15, 17–24], or through inserting FRP bars, strips or dry carbon fibre sheets into grooves cut in free concrete surfaces of the member for FRP strengthening of beams [9, 25–27]. Previous studies in the literature concluded that the use of FRP, externally bonded or near‐surface‐mounted, is an effective method for improving member strength.…”

Section: Introductionmentioning

confidence: 99%

“…Previous studies in the literature concluded that the use of FRP, externally bonded or near‐surface‐mounted, is an effective method for improving member strength. They also concluded that the level of strengthening may also be influenced by the FRP strip orientation and configuration [11, 16, 24, 26]. The effectiveness of the external FRP bonding has also been addressed and investigated previously [9, 17, 27–31].…”

Section: Introductionmentioning

confidence: 99%

Bau des Betongartens BUGA 2015 abgeschlossen

2015

Bautechnik

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Tests on reinforced concrete beams strengthened in shear using near surface mounted CFRP and steel bars

Cited by 79 publications

References 7 publications

Effect of adhesive replacement with cement mortar on NSM strengthened RC Beam

Effect of adhesive replacement with cement mortar on NSM strengthened RC Beam

Torsional Strengthening of RC Beams with Near‐Surface Mounted Steel Bars

Bau des Betongartens BUGA 2015 abgeschlossen

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