Research on Hysteretic Performance of Prefabricated Column-Base Joints with Replaceable Composite Energy-Dissipation Components

Based on the design concepts of plastic damage control and replaceable energy-dissipation components， a prefabricated column-base joint with replaceable composite energy-dissipation components is proposed. The joint consists of H-shaped steel columns and composite energy-dissipation components （including L-shaped tension-compression energy-dissipation plates and shear energy-dissipation devices） assembled with high-strength bolts， forming a “tension/compression-shear” dual energy-dissipation mechanism that ensures the bearing capacity and enables damage control and post-earthquake replacement. A total of ten joint models were established in ABAQUS software to simulate their behavior under cyclic loading. The hysteretic curves， skeleton curves，and stress distribution differences of joint models with different parameters were compared and analyzed， and the influence laws of key parameters on the hysteretic performance of joints were summarized. The results showed that the width ratio and thickness ratio of the L-shaped tension-compression energy-dissipation plates， as well as the axial compression ratio， were all important parameters affecting the hysteretic performance of the novel column-base joints. Increasing the width ratio and thickness ratio of L-shaped tension-compression energy-dissipation plates effectively improved the bearing capacity of the joints， but also increased the stress in the structural columns. It was suggested that the width ratio and thickness ratio should be in the ranges of 0.3-0.7 and 0.5-1.0， respectively. Increasing the axial compression ratio reduced the ductility of the joints， thereby affecting the safety and reliability of the structure.