Impact of incorporating parallel-threaded mechanical coupler splices on the seismic behaviour of reinforced concrete columns

This study compared the performance of reinforced concrete (RC) columns using mechanical couplers with that of traditional overlapping splices under axial and cyclic loading conditions. Splicing methods incorporating larger diameters are critical for ensuring the structural integrity of large structures, for which safety is of paramount importance. Overlapping splices often result in congestion and poor construction quality owing to the complex RC detailing in the joints. Mechanical couplers enable efficient installation and provide economic benefits. In this study, RC columns with different splicing configurations were tested using quasistatic cyclic lateral loading. The coupler properties, geometry, and position were analysed. The results demonstrate that mechanical couplers can maintain or slightly enhance the ductility, energy dissipation, and self-centring capacity while effectively maintaining the stiffness and strength. These findings suggest that mechanical couplers are superior alternatives to traditional rebar splicing methods for improving the overall performance and reliability of RC structures in large-scale construction projects.