Size Effects for Reinforced Concrete Beams Strengthened in Shear with CFRP Strips

Numerical analysis of reinforced concrete beams containing bending and shear opening and strengthened with FRP sheet

“…Hafiz et al (2014) investigated the influence of opening type on strength and behavior of reinforced concrete (RC) beams using numerical analyses. Godat et al (2010) studied the size effect on the behavior of RC beams using experimental and numerical analyses. Abdalla et al (2003) used fiber reinforced polymer (FRP) sheets to strengthen the opening region in their experiment.…”

Bridging the gap between small scale phenomena and large scale beams strengthened with FRP – A 1D XFEM high order approach

“…Three exceptional works were presented by Czaderski and Motavalli [4], Godat et al [5], and Leung et al [6]. The first one has studied a 17 m long prestressed concrete beam strengthened with FRP and revealed intermediate crack debonding mechanisms that are fundamentally different from the ones observed in laboratory scale beams [4].…”

“…The differences are mainly found in the stability of the debonding process and its potential arrest, a phenomena that was observed in the large beam but not is laboratory scale ones. Godat et al [5] and Leung et al [6] studied a different aspect of the size effect and focused on beams strengthened with FRP for shear and on the effect of size on their upgraded strength. The experimental study in Godat et al.…”

“…The experimental study in Godat et al. [5] has shown that the size effect and the relative contribution of the FRP system play critical roles in the behavior of the beam. Leung et al [6] have experimentally revealed a size effect in the sense that the effectiveness of the strengthening system in beams strengthened with FRP U jackets is very sensitive to the size of the beam, decreases with the increase in size, and notably changes from laboratory size beams to realistic ones.…”

“…The three experimental studies [4][5][6] emphasize the potential dependency of various aspects of the structural behavior on the size of the tested specimen. These observations highlight the challenge associated with the modeling and the analysis of large scale FRP strengthened beams and bridging the gap between the large scale beams and the small scale phenomena.…”