Experimental and numerical study of a metal-friction hybrid damper

This paper describes the development and evaluation of a new type of metal-friction hybrid damper (MFHD). The MFHD consists of three key components: an elastoplastic module, a friction module, and a stop module. These components are arranged in a three-stage working mechanism, comprising a friction stage, a coupled stage and a residual stage. The seismic performance of the MFHD was investigated through quasistatic tests on eight specimens. The study discusses the effect of segment length, diameter, and slipping displacement on the mechanical performance of the damper. Increasing the segment diameter by 15% improved the stiffness by 23.4% and the energy dissipation capacity (CED) by 44.4%. However, increasing the segment length by 50% and 100% decreased the CED by 6.4% and 56.7%, respectively. Furthermore, adding a slipping displacement of 3 mm to the specimen increased the energy dissipation capacity by 324.9%. Detailed numerical models were established and validated against the experimental results. The accuracy of the models in predicting the multiwave and fracture location of the member provided a valuable tool for further analysis and optimization. Subsequently, the model was utilized to investigate the effects of the friction force and the gap between the outer tube and inner core on the seismic performance of the MFHD. The study demonstrates that friction force could enhance the bearing capacity of the MFHD, while an increase in the gap had an adverse impact on its mechanical properties under compression.