Experimental and Modeling Study on Long-Term Deformation of Three-Span Prestressed Concrete Continuous Box-Girder Bridge Model after Cracking
Publication: Journal of Bridge Engineering
Volume 29, Issue 10
Abstract
To explore the long-term deformation performance of a large-span prestressed concrete continuous box-girder bridge after overload, a three-span prestressed concrete continuous box-girder bridge model with a length of 24.88 m was designed. The long-term deformation performance experiment was conducted for 558 days, and the prestress loss, deflection behavior, strain development, crack increase, and support reaction transformation of the bridge model were analyzed, which could indicate that the deformation of the bridge model developed rapidly in the first 3 months, reaching 60%–70% of the total deformation, and then tended to be stable. The midspan section appeared to reverse arch at the beginning, and with the extension of time, the negative bending moment at the two middle supports decreased owing to the redistribution of the bending moment, resulting in the disappearance of the camber phenomenon. Besides, considering the influence of cracking on the redistribution of the internal force of the structure, the moment modulation coefficient was modified by introducing a damage coefficient. Based on the bending performance test results of the bridge model, the bending moment amplitude modulation method and long-term deflection theory were used for analysis, and the long-term deflection calculation formula of the bridge model was established according to the conjugate beam method. The results showed that the theoretical calculation value of long-term deflection of each midspan section of the test girder was in good agreement with the test results, and the maximum error was less than 15%, which can provide a reference for the safety evaluation of the prestressed concrete continuous box-girder bridges.
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Data Availability Statement
All data, models, and codes that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
This research was funded by the National Natural Science Foundation of China (Grant No. 52278174) and the Natural Science Foundation of Hunan Province (Grant No. 2021JJ50139).
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Information & Authors
Information
Published In
Journal of Bridge Engineering
Volume 29 • Issue 10 • October 2024
Copyright
© 2024 American Society of Civil Engineers.
History
Received: Oct 16, 2023
Accepted: May 22, 2024
Published online: Jul 18, 2024
Published in print: Oct 1, 2024
Discussion open until: Dec 18, 2024
ASCE Technical Topics:
- Box girders
- Bridge engineering
- Bridge management
- Bridge tests
- Bridges
- Bridges (by material)
- Bridges (by type)
- Concrete
- Concrete bridges
- Continuous bridges
- Continuum mechanics
- Deformation (mechanics)
- Engineering fundamentals
- Engineering materials (by type)
- Engineering mechanics
- Field tests
- Girders
- Materials engineering
- Materials processing
- Prestressed concrete
- Prestressing
- Solid mechanics
- Structural engineering
- Structural mechanics
- Structural members
- Structural systems
- Tests (by type)
Authors
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