Simplified Analytical Model for Predicting the Transverse Stress of Steel Box Girder with Large Cantilevers in Cable-Stayed Bridges
Publication: Journal of Bridge Engineering
Volume 28, Issue 1
Abstract
The geometry and structural behavior of steel box girders with large cantilevers utilized in cable-stayed bridges are intricate. Due to the large cantilever, the transverse stress in the steel box girder cannot be ignored. To investigate the transverse stress distribution law of the steel box girder, a test was conducted on a 1:4.5 scale segment of a cantilever steel box girder in a cable-stayed bridge model. The distribution patterns of the transverse stress in the top and bottom plates of the steel box girder under six distinct load cases were analyzed. It was discovered that positive and negative transverse stresses appeared simultaneously in the top plate when solely subjected to the train load, whereas this phenomenon did not occur in the bottom plate. Furthermore, an improved simplified analytical model was proposed for predicting the transverse stress of the steel box girder. In comparison with the results of the test model, the rationality of the simplified analytical model was substantiated. Moreover, on the basis of the simplified analytical model, the phenomenon of concurrently occurring positive and negative transverse stresses was explained, and the maximum transverse stress distribution in the top and bottom plates under the action of a unit moving load was obtained. The location of the maximum transverse stress in the top and bottom plates was also discussed. The outcome of this paper could serve as a reference in the design of steel box girders with large cantilevers in cable-stayed bridges.
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Acknowledgments
This work was generously supported by the scientific and technological research and development project of the China National Railway Group Co., Ltd (P2019T001, K2018G058), the Sichuan Science and Technology Program (2021YJ0054), the China-Indonesia Joint Research Center on High-Speed Railway Technology (KY201801005), and the Science and Technology Department of Guangxi Zhuang Autonomous (2021AA01007AA).
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Information & Authors
Information
Published In
Journal of Bridge Engineering
Volume 28 • Issue 1 • January 2023
Copyright
© 2022 American Society of Civil Engineers.
History
Received: Jun 26, 2022
Accepted: Sep 22, 2022
Published online: Nov 10, 2022
Published in print: Jan 1, 2023
Discussion open until: Apr 10, 2023
ASCE Technical Topics:
- Beams
- Box girders
- Bridge engineering
- Bridges
- Bridges (by material)
- Bridges (by type)
- Cable stayed bridges
- Cables
- Cantilever bridges
- Cantilevers
- Engineering fundamentals
- Equipment and machinery
- Girder bridges
- Girders
- Steel bridges
- Stress (by type)
- Stress analysis
- Structural analysis
- Structural engineering
- Structural members
- Structural systems
- Wood bridges
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