期刊
STEEL AND COMPOSITE STRUCTURES
卷 41, 期 3, 页码 447-459出版社
TECHNO-PRESS
DOI: 10.12989/scs.2021.41.3.447
关键词
interface damage; long-term evolution; mapping characteristics; track deformation; track irregularity
资金
- National Natural Science Foundation of China [51878563]
- Ministry of Science and Technology of China [KY201801005]
- Research on Key Technologies of Long-span Cable-stayed Bridge with Wide Steel Box Girder for Single-Level Rail-Cum-Road Traffic [SRIG2019FW0001]
This study proposes a theoretical model to clarify the influence mechanism of track defects on the track irregularity of high-speed railway bridges under pier settlement, including void under slab, interlayer debonding, and fastener fracture. The elongation coefficient of track deformation is used to describe the mapping characteristics of interlayer parameters to track geometric under additional bridge deformation. The fundamental mechanisms of track deformation are elucidated, laying a theoretical basis for further study of infrastructure long-term evolution.
Track defects can change the interaction between layers and affect the nonlinear contact between the beam and base slab, causing deformations in the rail. This study proposes a theoretical model to clarify the influence mechanism of track defects on the track irregularity of high-speed railway bridges under pier settlement. The investigated track defects include the void under slab, interlayer debonding, and fastener fracture. The elongation coefficient of track deformation is used to describe the mapping characteristics of the interlayer parameters to track geometric under the additional bridge deformation. The geometric characteristics and changing trend of the rail surface are quantified under the influence of the failure position and critical length. Finally, the fundamental mechanisms of track deformation are elucidated, which lays a theoretical basis for further study of the long-term evolution of infrastructure.
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