Dynamic Amplification Factor Variation Analysis of a High-Speed Railway Bridge under Multiple Loading Cases
Publication: Journal of Performance of Constructed Facilities
Volume 37, Issue 1
Abstract
Long-span and wide railway bridges are loaded with various loading cases, and the structural dynamic amplification factor (DAF) corresponding to different loading cases has great variability. This study presents an approach to obtaining DAF under different loading cases. Then the approach is applied to the analyses of DAFs from long-term monitoring data. The usual values of vibration amplitude and DAF under eight single-train loading cases during long-term operation are analyzed, and the midspan amplitude and displacement DAF of the main girder under the typical two-vehicle intersection, three-train intersection, and four-train intersection loading cases are also investigated. The correlation between the DAF of the eight loading cases, the structural temperature, and the train speed under the single-train loading case is analyzed. The obtained results show that in the long-term operation, the vibration amplitude level and DAF level of the railway bridge are mainly related to the train loading case, and in 16-carriage loading cases, the DAF value is higher than that in eight-carriage loading cases in the same line. The vertical dynamic response of the midspan main girder under each working condition is small. Furthermore, depending on this evolution law, different traffic loading cases must be considered during the assessment of dynamic performance.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
This research work was jointly supported by the National Natural Science Foundation of China (Grant Nos. 52250011 and 52078102) and the Fundamental Research Funds for the Central Universities (Grant Nos. DUT22ZD213 and DUT22QN235).
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Information & Authors
Information
Published In
Journal of Performance of Constructed Facilities
Volume 37 • Issue 1 • February 2023
Copyright
© 2022 American Society of Civil Engineers.
History
Received: May 27, 2022
Accepted: Oct 21, 2022
Published online: Dec 9, 2022
Published in print: Feb 1, 2023
Discussion open until: May 9, 2023
ASCE Technical Topics:
- Bridge engineering
- Bridges
- Bridges (by type)
- Continuum mechanics
- Design (by type)
- Dynamic loads
- Dynamic structural analysis
- Dynamics (solid mechanics)
- Engineering fundamentals
- Engineering mechanics
- Highway and road management
- Highway transportation
- Highways and roads
- Infrastructure
- Intersections
- Load factors
- Motion (dynamics)
- Rail transportation
- Railroad bridges
- Skew bridges
- Solid mechanics
- Structural analysis
- Structural design
- Structural dynamics
- Structural engineering
- Transportation engineering
- Vibration
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