Abstract
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.
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Acknowledgments
The authors are grateful to New Mexico State University undergraduate students Matt Dorsey, Adam Heckathorn, Devon Willett-Gies, and Steven Brown, without whose enthusiastic effort the findings in this paper would not have been possible.
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Published In
Journal of Structural Engineering
Volume 143 • Issue 9 • September 2017
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©2017 American Society of Civil Engineers.
History
Received: Jul 13, 2016
Accepted: Feb 24, 2017
Published online: May 26, 2017
Published in print: Sep 1, 2017
Discussion open until: Oct 26, 2017
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