Verification of Incremental Launching Construction Safety for the Ilsun Bridge, the World’s Longest and Widest Prestressed Concrete Box Girder with Corrugated Steel Web Section
Publication: Journal of Bridge Engineering
Volume 16, Issue 3
Abstract
The Ilsun Bridge is the world’s longest (801 m in total length) and widest (30.9 m in maximum width) prestressed concrete box girder bridge incorporating a corrugated steel web. This bridge has fourteen spans, twelve of which were erected using an incremental launching method, a method that is rarely applied in this type of bridge. To verify the construction safety of the Ilsun Bridge, this investigation focuses on the span-to-depth ratio, buckling shear stress of the corrugated steel webs, optimization of the length of the steel launching nose, detailed construction stage analysis, and the stress level endured by the corrugated steel webs during the launching process. The span-to-depth ratio of the Ilsun Bridge was found to be well-designed, using a conservative corrugated steel web design. Further, our investigation revealed that the conventional nose-deck interaction equation was not suitable for corrugated steel web bridges. As a result, a detailed construction stage analysis and measurements of this bridge was performed to examine stress levels and ensure safety during the erection process. The results revealed that there are essential design issues that should be considered when designing prestressed concrete box girder bridges with corrugated steel webs and that, when constructing them, the incremental launching method should be used.
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Acknowledgments
This work was supported by a grant (05 construction core C14) from the Construction Core Technology Program by the Ministry of Construction and Transportation of the Korean government. The writers wish to express their gratitude for financial support. The writers’ opinions, findings, and conclusions do not necessarily reflect the views of the sponsors.
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Information & Authors
Information
Published In
Journal of Bridge Engineering
Volume 16 • Issue 3 • May 2011
Pages: 453 - 460
Copyright
© 2011 American Society of Civil Engineers.
History
Received: Jun 30, 2009
Accepted: Aug 19, 2010
Published online: Aug 27, 2010
Published in print: May 1, 2011
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