Joint Friction during Deployment of a Near-Full-Scale Tensegrity Footbridge
Publication: Journal of Structural Engineering
Volume 143, Issue 9
Abstract
Most deployable structures, such as operable roofs and masts, move over one degree of freedom. This paper describes a structure that involves loosely coupled movement over several degrees of freedom. Analysis models of these structures are typically inaccurate. A source of inaccuracy is joint friction. Static and kinetic friction are studied experimentally and analytically. Simulations have been modified to account for these effects, and two methods are used to quantify friction effects. Friction has a significant effect on the movement of the tensegrity structure. Of two candidate parameters, cable tension and interior cable angle, cable angle is the factor that best characterizes friction effects. Values of static and kinetic friction coefficients are not significantly different in this context, and this leads to a reduction in the complexity of the friction model for simulation. Including friction effects in analysis decreases the difference between simulations and tests. Lastly, strut elements of the tensegrity structure are most critically affected by friction.
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Acknowledgments
The research is sponsored by the Swiss National Science Foundation under project number 20020_144305. The authors wish to express thanks to N. Bel Hadj Ali, J. F. Molinari, and N. Veuve for fruitful discussions and S. Despont for help with the design of the friction test.
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Published In
Journal of Structural Engineering
Volume 143 • Issue 9 • September 2017
Copyright
©2017 American Society of Civil Engineers.
History
Received: Nov 2, 2015
Accepted: Feb 13, 2017
Published online: Apr 25, 2017
Published in print: Sep 1, 2017
Discussion open until: Sep 25, 2017
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