Dynamic Response and Progressive Collapse of a Long-Span Suspension Bridge Induced by Suspender Loss
Publication: Journal of Structural Engineering
Volume 148, Issue 6
Abstract
Although long-span suspension bridges play a vital role in the transportation infrastructure, their resistance to disproportionate collapse resulting from locally induced damage has not yet been adequately investigated. In this study, computational simulation is used to shed light on how a prototype long-span suspension bridge responds to sudden loss of suspenders. Several scenarios were considered, with a focus on the total number of suspenders lost, their locations, and mode of removal. An increasing number of suspenders were removed either sequentially (i.e., one at a time) or simultaneously (i.e., multiple suspenders removed at the same time) until progressive collapse of the bridge was triggered. The simulation results showed that the bridge exhibited increasing levels of damage as the number of removed suspenders increased, and that the most critical location for suspender removal was near the middle of the bridge. It is shown that the sequential loss of a group of suspenders led to bridge responses that are almost identical with the simultaneous loss of the same group of suspenders. It is also argued that suspension bridges like the prototype system under consideration are highly robust.
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Data Availability Statement
All data shown in the paper are available from the corresponding author upon reasonable request.
Acknowledgments
This material is based upon work supported by Federal Highway Administration under Contract No. DTFH61-14-D-00010/693JJ318F000170. Any opinions, findings, and conclusions or recommendations expressed in this publication are those of the authors and do not necessarily reflect the views of the Federal Highway Administration. The US Government does not endorse products, manufacturers, or outside entities. Such names are included here for informational purposes only and are not intended to reflect a preference, approval, or endorsement of any product or entity.
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Published In
Journal of Structural Engineering
Volume 148 • Issue 6 • June 2022
Copyright
© 2022 American Society of Civil Engineers.
History
Received: Oct 18, 2021
Accepted: Feb 15, 2022
Published online: Apr 6, 2022
Published in print: Jun 1, 2022
Discussion open until: Sep 6, 2022
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