大跨斜拉桥预拱度设置对无砟轨道线形的影响

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Abstract Research purposes: To address the problem that the vertical deformation of large span ballastless track cable-stayed bridges of 350 km/h high-speed railway is easy to exceed the limit, setting a reasonable pre-camber is one of the effective solutions. This paper uses 60 m chord measurement method and train behavior dynamic evaluation method to evaluate and analyze the alignment of the Baihe Yujiang Main Bridge of Nanning-Yulin High Speed Railway under different load combination deformation, and explores the influence of various pre-camber schemes on the alignment of large span ballastless rail cable-stayed bridge.
Research conclusions: (1) Concrete shrinkage and creep is the main factor affecting ballastless track alignment standard control, and sufficient observation period of settlement deformation should be ensured before construction of ballastless tracks. (2) Under the effect of all temperature load and creep, the pre-arch scheme of "taking the negative value of the vertical deformation caused by a train operating on the bridge" has the most significant effect on alignment standard control. (3) Setting the pre-camber can effectively increase the equivalent radius of curvature and reduce the centrifugal acceleration. (4) The most unfavorable position of the large-span cable-stayed bridge is at the tower and the middle of the main span, which needs to strengthen the construction quality control and observation and maintenance during the operation period. (5) The research results can provide reference for the design and construction of large span cable-stayed bridge.

Key words： large span cable-stayed bridge ballastless track pre-camber 60 m chord measurement method train behavior dynamics

Received: 26 September 2022

PACS:

U212.3

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	WANG Jundong

Cite this article:

WANG Jundong. Research on the Influence of Pre-camber Setting of Large Span Cable-stayed Bridge for High-speed Railway on Ballastless Track Alignment Control[J]. Journal of Railway Engineering Society, 2022, 39(12): 41-48.

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https://tdgcxb.crec.cn/EN/ OR https://tdgcxb.crec.cn/EN/Y2022/V39/I12/41

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