Manufacturing, testing and simulation of novel dual-stage energy-dissipation and self-centering friction damper

This paper introduces a novel dual-stage energy-dissipation and self-centering friction damper (DESFD) integrating a flat surface friction damper (FSFD) for effective energy dissipation during low to moderate earthquake intensities, and collaborates with a wedge surface friction damper (WSFD) to reduce structural residual displacement in severe events. The concept and detailed configuration of DESFD was proposed, and its mechanism and hysteresis performance of DESFD were experimentally and theoretically investigated. Moreover, influence parameters including were numerically analyzed. The results showed that the performance of the DESFD stable energy dissipation and self-centering capability, with minimal damage to FSFD shims, demonstrate effective co-working between FSFD and WSFD, ensuring stable energy-dissipation and self-centering capability. Force-displacement curves ensuring comparing the single-stage and dual-stage self-centering dampers shows that their energy dissipation capacities are equal at displacements ranging from 0 to 10 mm, the dual-stage selfcentering damper exhibits a 37% higher equivalent viscous damping coefficient at initial loading than the singlestage self-centering damper. A validated numerical model explores damper stress distribution and parameter sensitivity, highlighting the significant impact of slope angle, preload, and disc spring stiffness on performance of energy-dissipation and self-centering. When slope angle (tan theta) increases from 0.3 to 0.4, the load increases by 45%.