Strengthening of Lap-Spliced RC Beams Using Near-Surface Mounting Method

An adequate bond between concrete and reinforcement along lap-splice length is necessary to prevent bond failure in lap-splice zone. Sometimes, lap splice has insufficient bond due to such various reasons as design and construction errors and needs strengthening. NSM and FRP confinement are highly promising methods compared to other available methods. NSM and NSM-CFRP confinement methods used for this purpose, and bonded length and concrete cover were considered as variables. The results reveal that the specifications of lap-spliced RC beams (load-bearing capacity, energy dissipation capacity, and ductility) are increased using strengthening methods. In the NSM, the lap-spliced beam's strength would be increased, while CFRP leads to more ductility. Besides, load-bearing capacity and ductility led to more values when the concrete cover is increased.