FINITE ELEMENT ANALYSIS OF COMPOSITE LOAD-BEARING SELF-RESETTING BEAM-COLUMN JOINTS

Based on the idea of damage control, a composite load-bearing self-resetting beam-column joint was proposed, which provided pretension for the structure through high-strength prestressed steel cables so that the structure could realize self-resetting subjected to earthquake action. The dog-bone weakened cover plate installed on the joint could be replaced after earthquake so that the structure was repaired. The finite element simulation for five joint models was conducted. By changing initial cable forces of high-strength prestressed cables and the thickness of dog-bone weakened cover plates, the influences of the two on the bearing capacity, energy dissipation capacity, self-resetting capacity and repairability after earthquake of the joints were studied, and the load-displacement curves, cable force change curves and stress distribution forms of the five models were obtained. The research showed based on the premise of ensuring the self-resetting of the model, the plastic damage without dog-bone weakened cover plates was more serious. The specimens with dog-bone weakening cover plates could effectively reduce the plastic damage of the main elements of the joints. Increasing the thickness of dog-bone weakening cover plates and cable forces could both improve the bearing capacity and energy consumption capacity of joints, but increasing the thickness of dog-bone weakening cover plates was more obvious.