原文传递
Bicycle-Inspired Adaptive Self-Centering Device: Development of the Prototype, Experimental Results, and Analytical Predictions
| 题名： | Bicycle-Inspired Adaptive Self-Centering Device: Development of the Prototype, Experimental Results, and Analytical Predictions |
| 其他题名： | Aiken,I.D.,Nims,D.K.,and Kelly,J.M.(1992)."Comparative study of four passive energy dissipation systems."Bull.N.Z.Soc.Earthquake Eng.,25(3),175–192. |
| 正文语种： | 英文 |
| 作者： | Jame Alexander |
| 关键词： | Structural control;Base-isolation;Self-centering |
| 摘要： | A new adaptive self-centering device for structural protection has been developed using the mechanism of traditional bicycle, which uses a combination friction-ratchet-pawl-lever mechanism. This device can be installed within a chevron bracing setup in a portal frame or can be used as an isolator. It manifests adaptive force-deformation behavior which entails lower postelastic stiffness and dissipation for smaller excitations and higher postelastic stiffness and dissipation for larger excitations. It also allows for adjustable slip load which is independent of the structure weight. The main components of the device are (1) two friction wheels, (2) two ratchet wheels, (3) two pawls, (4) a central shaft, (5) two recentering springs, (6) three horizontal sliders, and (7) a set of levers. The friction wheels and the ratchet wheels rotate about the central shaft, which is static. Each pawl is pinned to one friction wheel and presses the rim of one ratchet wheel through a torsion spring. A counterweight force is applied radially to the friction wheel. External lateral force that originates from structural vibrations is applied tangentially to the ratchet wheel through the horizontal sliders and levers. These levers are responsible for the adaptive nature of the device. The adaptive force-deformation hysteretic behavior of the device for quasi-static displacement input and for various values of counterweight is generated experimentally. These responses are also captured analytically by using basic mechanics. Sensitivity analyses are performed to evaluate the desired design parameters of the device. Preliminary nonlinear dynamic analyses conducted with selected strong-pulse cycloidal ground motions suggest that the proposed device will protect the parent structure better than the existing self-centering devices and state-of-the-art isolators such as the triple friction pendulum. |
| 出版年： | 2017 |
| 论文唯一标识： | P-26Y2017V143N09021 |
| 英文栏目名称： | TECHNICAL PAPERS |
| doi： | 10.1061/(ASCE)ST.1943-541X.0001830 |
| 期刊名称： | Journal of Structural Engineering |
| 拼音刊名(出版物代码)： | P-26 |
| 卷： | 143 |
| 期： | 09 |
| 页码： | 255-267 |
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