Abstract
Reinforced concrete (RC) structures require strengthening for numerous factors, such as increased load, modification of the structural systems, structural upgrade or errors in the design and construction stages. The side near-surface mounted (SNSM) strengthening technique with glass fiber-reinforced polymer (GFRP) bars is a relatively new emerging technique for enhancing the flexural capacities of existing RC elements. Nine RC rectangular beams were flexurally strengthened with this technique and tested under four-point bending loads until failure. The main goal of this study is to optimize the structural capacity of the RC beams by varying the amount of strengthening reinforcement and bond length. The experimental test results showed that strengthening with SNSM GFRP bars significantly enhanced the flexural responses of the specimens compared with the control specimen. The first cracking and ultimate loads, energy absorption capacities, ductility and stiffness were remarkably enhanced by the SNSM technique. It was also confirmed that the bond length of the strengthened reinforcement greatly influences the energy absorption capacities, ductility and stiffness. The effect of the bond length on these properties is more significant compared to the amount of strengthening reinforcement.
Highlights
Rehabilitation or strengthening of civil engineering infrastructure has gained significant attention due to deterioration problems of structures and meeting up-to-date design requirements [1].Numerous materials and methods have been used for strengthening structural elements
The aim of this paper is to further investigate the flexural behavior of reinforced concrete (RC) beams strengthened by the side near-surface mounted (SNSM) technique using glass fiber-reinforced polymer (GFRP) bars
The experimental study was conducted to investigate the performance of RC beams strengthened with SNSM-GFRP bars
Summary
Numerous materials and methods have been used for strengthening structural elements. The most frequently-utilized materials for structural strengthening are steel plate and fiber-reinforced polymer (FRP). There are three types of FRP (carbon, glass and aramid) used for strengthening of structures [2]. The external bonding reinforcement (EBR) and near surface mounted (NSM) techniques are very popular for strengthening or upgrading of structural members [3,4,5,6]. The strengthening plates or laminates are glued on the tension face of the reinforced concrete (RC) beams in the EBR technique [7]. The debonding failure of the strengthening beams due to the high shear stress at the plate end [8] and corrosion of the plates due to the environmental effects [9] are some of the main concerns of the EBR technique.
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