Optimization of Truss Girders in Cable-Supported Bridges Including Stability
Publication: Journal of Bridge Engineering
Volume 25, Issue 11
Abstract
The main design principles for girders in cable-supported bridges have not changed significantly over the past 60 years, and are limited in further development. The design concept suffers from substantial fatigue issues, and will be challenged by self-weight in future very-long bridges with main spans beyond 2 km. In this work, truss topology optimization, including global and local stability, is applied in a conceptual study of new weight-reduced designs for girders in cable-supported bridges. The methods are based on finite-element limit analysis and convex optimization. A single section of a continuous girder, subject to local and global loads, is optimized to minimize weight while fulfilling constraints on stresses as well as global and local stability. The optimized designs, significantly different in layout from the conventional, show initial weight savings of up to compared with the present design. Further parameter studies indicate potential weight savings of up to .
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Acknowledgments
The presented work is part of an industrial PhD project with the title “Innovative design of steel bridge girders in cable-supported bridges” and is carried out in cooperation with COWI A/S, DTU Civil Engineering, and DTU Mechanical Engineering. The project is supported financially by the COWI Foundation grant C-131.02 and Innovation Fund Denmark grant 5189-00112B.
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Published In
Journal of Bridge Engineering
Volume 25 • Issue 11 • November 2020
Copyright
© 2020 American Society of Civil Engineers.
History
Received: Nov 21, 2019
Accepted: Jun 11, 2020
Published online: Sep 15, 2020
Published in print: Nov 1, 2020
Discussion open until: Feb 15, 2021
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