Finite Element Study on Hysteretic Properties of Steel Frame Joints with Self-Centering Energy Dissipation Dampers

In order to reduce the residual deformation of traditional building structures after an earthquake， a novel self-centering energy dissipation damper is proposed. Theoretical analysis and structural design of the damper were carried out. The damper resets itself through the combination of a spiral compression spring and a shape memory alloy （SMA）， with energy dissipation achieved through the tensile process of the SMA rod and the sliding friction between other components. The force relationship between each component is clear， and the overall structure is simple and easy to install. The effects of the initial pretension of the SMA rod， the initial pre-pressure of the helical compression spring， and the friction coefficient between the components on the bearing capacity， energy dissipation capacity， and resetting capacity of the damper were comprehensively investigated by means of finite element simulation. The mechanical properties of steel frame beam-column joints equipped with the dampers were further analyzed. The results showed that the novel self-centering energy dissipation damper exhibited strong stability and excellent self-centering energy dissipation effect in both tension and compression processes， characterized by a "flag-shaped" hysteretic curve. When the self-centering energy dissipation damper was installed in the steel frame beam-column joint， it dissipated a large amount of energy and effectively controlled the residual deformation of the joint.