Study on the Degradation Model of Service Performance in Railway Steel–Concrete Composite Beams Considering the Cumulative Fatigue of Steel Beams and Studs Based on Vehicle–Bridge Coupling Theory

The steel–concrete composite beam, as a structural form that combines the advantages of steel and concrete, has been applied in railway engineering. However, with the increase in railway operation time, the degradation pattern of the service performance of steel–concrete composite bridges remains un...

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Bibliographic Details
Published in:Buildings (Basel) 2024-11, Vol.14 (11), p.3391
Main Authors: Gao, Ce, Zhang, Cheng, Han, Bing
Format: Article
Language:English
Subjects:
Bridges
Composite beams
Composite bridges
Composite materials
Concrete
Concrete bridges
Cumulative damage
cumulative fatigue damage
Degradation
Fatigue
Fatigue failure
Fatigue testing machines
long-term service performance
Materials
Metal fatigue
natural frequency
Rail steels
Railroads
Railway bridges
Railway engineering
Resonant frequencies
Service life
Steel
Steel beams
steel–concrete composite girder
Structural forms
Studs
vehicle–bridge coupling
Vibration
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Summary:The steel–concrete composite beam, as a structural form that combines the advantages of steel and concrete, has been applied in railway engineering. However, with the increase in railway operation time, the degradation pattern of the service performance of steel–concrete composite bridges remains unclear. This paper proposes a method for calculating the long-term service performance of railway steel–concrete composite beams, considering the cumulative fatigue damage of steel beams and studs, based on the vehicle–bridge coupling theory and Miner’s linear cumulative damage criterion. The proposed method is validated using measured data from an in-service steel–concrete composite railway bridge with spans of 40 + 50 + 40 m. The calculated mid-span vertical displacement and the first two natural frequencies of the composite beam deviated from the measured results by only 2.1%, 7.7%, and 9.5%, respectively. The research results can provide a basis for extending the service life of composite beams and preventing the occurrence of safety accidents.
ISSN:2075-5309
2075-5309
DOI:10.3390/buildings14113391