分阶段耗能摩擦-金属复合型阻尼器试验研究

To solve the problems of low energy dissipation efficiency of traditional metal dampers under frequently occurred earthquakes and insufficient energy dissipation capacity of friction dampers under rarely occurred earthquakes, a friction-metal coupled damper (FMCD) with staged energy dissipation was proposed. Considering the effects of the energy-dissipating materials of the metal damper (LY160 and Q235) and the bolt torque of the friction damper (80 N·m and 120 N·m) on the mechanical performance of the FMCD, four FMCDs were designed and subjected to quasi-static test. The results show that the FMCD exhibits frictional energy dissipation before the stop-slip mechanism is triggered, and the metal damper enters plastic energy dissipation after the loading displacement is larger than the stop-slip displacement. By increasing the preload torque of the friction damper part by 50%, the peak load and cumulative energy dissipation of the FMCD in the friction phase increase by 23% and 18%, respectively. Compared with the FMCD with Q235 energy dissipation, the peak load of the FMCD with LY160 energy dissipation decreases by 7. 6%, but the cumulative energy dissipation increases by an average of 29. 9% and the ultimate displacement increases by 15 mm.