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A platform for research: civil engineering, architecture and urbanism
Friction mechanism and experimental investigation of the response‐amplified friction damper
Buildings may need large damping force under severe or near‐fault earthquakes, while existing friction dampers still need a high preload to provide enough reaction forces. In order to provide large damping forces at a small preload, this study proposes a new type of response‐amplified friction damper (RAFD) based on the amplification mechanism of a ball screw pair that combines the advantages of a friction damper and inerter device. The friction mechanism and the restoring force formula of the RAFD were derived theoretically, then pseudo‐static tests with various parameters were conducted. Finally, a single‐degree‐of‐freedom (SDOF) structure was employed to compare the effectiveness of the RAFD with a conventional friction damper under various earthquake levels. The results show that the RAFD has a significant friction amplification effect and significantly reduces the seismic responses of the SDOF structure. Particularly, the proposed RAFD with preload only 2 kN results in better effectiveness than the conventional friction damper with preload up to 20 kN. According to the pseudo‐static tests, the derived theoretical model can accurately describe the hysteresis behavior of the RAFD. A smaller gap in the RAFD can further improve the effectiveness in response mitigation.
Friction mechanism and experimental investigation of the response‐amplified friction damper
Buildings may need large damping force under severe or near‐fault earthquakes, while existing friction dampers still need a high preload to provide enough reaction forces. In order to provide large damping forces at a small preload, this study proposes a new type of response‐amplified friction damper (RAFD) based on the amplification mechanism of a ball screw pair that combines the advantages of a friction damper and inerter device. The friction mechanism and the restoring force formula of the RAFD were derived theoretically, then pseudo‐static tests with various parameters were conducted. Finally, a single‐degree‐of‐freedom (SDOF) structure was employed to compare the effectiveness of the RAFD with a conventional friction damper under various earthquake levels. The results show that the RAFD has a significant friction amplification effect and significantly reduces the seismic responses of the SDOF structure. Particularly, the proposed RAFD with preload only 2 kN results in better effectiveness than the conventional friction damper with preload up to 20 kN. According to the pseudo‐static tests, the derived theoretical model can accurately describe the hysteresis behavior of the RAFD. A smaller gap in the RAFD can further improve the effectiveness in response mitigation.
Friction mechanism and experimental investigation of the response‐amplified friction damper
Zhao, Guifeng (author) / Ma, Yuhong (author) / Yang, Zhenyu (author) / Wang, Qiang (author) / Li, Yanmin (author)
2022-07-01
19 pages
Article (Journal)
Electronic Resource
English