Flexural and Shear strengthening of RC beams with NSM technique-manually made CFRP bars

Abstract

Abstract. In this paper, the e ciency of NSM method for both exural and shear strengthening of RC beams was examined by applying an innovative manually made CFRP bar (MMFRP) as an alternative reinforcement composite material through experimental and numerical investigation. The experimental program consists of three inverted T-section RC exural-dominated beams and three rectangular section RC shear-dominated beams involving parameters of length, anchoring of MMFRP bars, and their inclination to the beams' longitudinal axis. The structural performances of the tested beams and the FiniteElement (FE) modelling approach, including modes of failure, load-de ection response, and ultimate load capacity, were presented and discussed. Test results indicated that using the proposed MMFRP bars signi cantly improved the exural resistance and shear capacity of de cient concrete beams. Furthermore, a reduction in the crack width along with an increase in the quantity and propagation of new cracks was observed in strengthened beams, compared to control beams.

A Parametric Study on the Flexural Strengthening of Reinforced Concrete Beams with Near Surface Mounted FRP Bars

“…Hence, a great number of researchers have studied the effective factors affecting the efficiency of application FRP with different techniques like NSM and EBR via various methods and solutions. Experimental studies of Al-Mahmoud et al [14], Barros and Fortes [15] Bilotta et al [6,7,9], Grace et al [2], Lee et al [16], Lu et al [17], Novidis et al [13], Rizzo, and De Lorenzis [18], Sharaky et al [11,[19][20][21], Tang et al [22], Wang et al [23], Wu et al [24] and numerical analyses of Bianco et al [25,26], Coelho et al [27], Hawileh [28], Kara et al [29], Kaveh et al [30], Seo et al [31], Sharaky et al [20], Teng et al [32], Zhang et al [33] are some of the most recent and pioneer studies in the field of strengthening existing structures with FRP according to the near surface mounted (NSM). Despite the fact that innumerable recent studies devoted at appraising the potentialities of strengthening existing structures with FRP, nevertheless limited design guidelines are currently available for either the externally bonded reinforcement or near surface mounted strengthening technique.…”