Forensic Diagnosis on Flood-Induced Bridge Failure. II: Framework of Quantitative Assessment
Publication: Journal of Performance of Constructed Facilities
Volume 28, Issue 1
Abstract
The failure of the Shuang-Yuan Bridge in Taiwan caused by floods associated with Typhoon Morakot in August 2009 prompted this forensic investigation into its causes. The investigation found multiple factors for the bridge failure: (1) flood flows, (2) river-bend-induced skewed flow, and (3) the effects induced by extended foundation caps and rafted woody debris. A qualitative assessment framework, which includes hydraulic computation, a fluid-solid-coupled model, and foundation stability analysis, is introduced to develop scenario simulations and forensic diagnosis to identify the main causes of the bridge failure. The watershed-wide and local hydraulic conditions are reconstructed using hydraulic computation. The flow field, dynamic water-pressure distributions, scour formation, flood resistance, and flood thrust are efficiently simulated using a fluid-solid-coupled model and foundation stability analysis around the bridge foundations under different hydraulic and environmental conditions. The forensic diagnosis results show that river flooding, extended foundations, skewed flow, and rafted wood aggravated the scour depths and undermined the flood-resistant capacity of the bridge at different severities. In particular, rafted wood contributed to individual fracturing of the bridge piles.
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Acknowledgments
This forensic investigation was supported by a grant from the Third District Maintenance Construction Office, the Directorate General of Highways of the Ministry of Transportation and Communications, in Taiwan. The authors greatly appreciate the financial support and assistance of the Ministry of Transportation and Communications.
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Information & Authors
Information
Published In
Journal of Performance of Constructed Facilities
Volume 28 • Issue 1 • February 2014
Pages: 85 - 95
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Mar 1, 2012
Accepted: Sep 10, 2012
Published online: Sep 12, 2012
Published in print: Feb 1, 2014
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