CRTS Ⅲ型板式无砟轨道-PC简支梁长期变形研究

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Abstract Research purposes: Taking the CRTS Ⅲ slab ballastless track-prestressed concrete simply supported girders (the girder-rail system) as the research object, the long-term deformation of the girder-rail system is studied under the action of concrete shrinkage and creep, the long-term stress characteristics of the base plate and the self-compacting concrete, as well as the vertical and longitudinal forces of fasteners are analysed.
Research conclusions: (1) Compared with the single box girder (the uniform load converted from the ballastless track system is applied on), the creep camber of the box girder of the girder-rail system is increased. (2) The long-term deformation of the box girder leads to a camber of the ballastless track and causes vertical deformation differences between the rail and the slab track, and between the base plate and the self-compacting concrete, thus leading to voids between the base plate and the self-compacting concrete. (3) The longitudinal tensile stress of the base plate and the self-compacting concrete, and the vertical additional force of the fastener are small, but the longitudinal additional force of the fastener reaches the limit value within a certain range at the girder end. (4) The small resistance fastener can effectively weaken the girder-rail interaction and reduce the longitudinal stress of the ballastless track and the vertical additional force of the fastener caused by the long-term deformation of the box girder. (5) The research in this paper reveals the long-term deformation coordination mechanism of the girder-rail system, which can provide a theoretical basis for the maintenance of CRTS Ⅲ slab ballastless track structure during service.

Key words： box girder ballastless track shrinkage and creep long-term deformation longitudinal stress

Received: 12 October 2022

PACS:

U213.9

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	Articles by authors
	ZHENG Zhihui
	LIU Lei
	LIU Peng
	YU Zhiwu

Cite this article:

ZHENG Zhihui,LIU Lei,LIU Peng, et al. Research on the Long-term Deformation of CRTS Ⅲ Slab Ballastless Track-prestressed Concrete Simply Supported Girders[J]. Journal of Railway Engineering Society, 2024, 41(3): 29-37.

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https://tdgcxb.crec.cn/EN/ OR https://tdgcxb.crec.cn/EN/Y2024/V41/I3/29

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