Experimental Research on Mechanical Properties of Novel Prefabricated Concrete Column Joints with Mortise-Tenon Type Connectors

The development of new industrialized structures and connections adapted to intelligent construction is currently a hot topic. A novel mortise-tenon type connector was proposed for prefabricated concrete column-column. Experimental studies were conducted on the key component, the mortise-tenon connector, to evaluate the influence of tenon dimensions on bearing capacity, deformation with stiffness. The experimental results indicated that the load-displacement curves of the specimens had no distinct yield plateau. The tensile stiffness exceedsed the initial tensile stiffness but was less than the compressive stiffness. Failure modes include shear failure at the bottom of the hole and tensile failure of the tensile bars on both sides of the hole, which were related to the shear height at the bottom of the tenon and the width of the tensile bars on both sides. The effects of monotonic loading and cyclic loading on tensile bearing capacity, deformation, and failure modes were found to be insignificant. Furthermore, the peak load and residual deformation under the force control loading stage of the specimens met the standards for Class I connection joints specified in the Technical Specification for Mechanical Splicing of Steel Reinforcing Bars (JGJ 107—2016).