Optimization of Footbridges Composed of Prismatic Tensegrity Modules
Publication: Journal of Bridge Engineering
Volume 24, Issue 12
Abstract
The architectural potential of tensegrity structures is proven. Yet, paradoxically, very few real construction projects have been built around the world. The main reasons are complex construction processes, lack of design and optimization guidelines, and excessive self-weight due to the prestress needed to guarantee stiffness and dynamic behavior. Hence, optimizing the stiffness and self-weight is a key aspect when designing a tensegrity footbridge. Previous research has demonstrated the validity of a design and optimization methodology, based on morphological indicators, that identifies geometry with a maximum stiffness and/or a minimum self-weight for a family of structures. In this paper, that methodology is applied to footbridges composed of tensegrity modules comprising simplex, quadruplex, pentaplex, and hexaplex types. A comparison of the stiffest and lightest structures is provided, a practical case study is developed, and the relevance and feasibility of such tensegrity footbridges are discussed. As a result, the study provides advice on optimum footbridge topologies with the following characteristics: excellent stiffness and dynamic behavior; efficient structures composed of simplex modules; and self-weight that is still rather high but similar to that of bended structures, although with potential to be reduced thanks to optimization of the prestress scenario.
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Acknowledgments
The authors would like to thank BESIX Group for supporting this work. Project funded by Brussels Capital Region–Innoviris.
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Published In
Journal of Bridge Engineering
Volume 24 • Issue 12 • December 2019
Copyright
© 2019 American Society of Civil Engineers.
History
Received: May 10, 2018
Accepted: Feb 8, 2019
Published online: Sep 17, 2019
Published in print: Dec 1, 2019
Discussion open until: Feb 17, 2020
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