Abstract
Near-surface mounted (NSM) reinforcement involves cutting grooves into a concrete cover and bonding reinforcing bars inside the grooves using an appropriate filler. A large-scale experimental program was conducted to study the behavior of reinforced concrete (RC) columns under simulated seismic loading, strengthened in flexure with different types and configurations of NSM reinforcing materials. Lateral load-versus-displacement response characteristics (peak force, drift ratios, energy dissipation, and stiffness) were compared in order to examine the role of different parameters. The parameters include carbon or glass fiber-reinforced polymers (FRP) versus stainless steel, configuration and amount of NSM reinforcement, confinement via local jacketing, and type of bonding agent (epoxy resin or mortar). The results show that NSM FRP or stainless steel reinforcement is a viable solution toward enhancing the flexural resistance of RC columns subjected to seismic loads. All types of NSM reinforcing elements reached large axial strains. Local confinement with textile-reinforced mortar jackets was effective in controlling buckling of the NSM reinforcement, thus enabling this reinforcement to reach higher strains at failure. Epoxy-based bonding agencies inside grooves were more effective than cement-based mortar bonding agents.
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