100 m简支钢桁梁桥无缝线路伸缩力影响因素研究

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Abstract Research purposes: Ballastless track continuous welded rails (CWR) is used on 100 m simply supported steel truss bridge of a mixed passenger and freight railway. In order to study the expansion and contraction force and influence factors of CWR on 100 m simply supported steel truss bridge, a track-bridge-piers spatial finite element model is established, and the influence of design parameters such as number of bridge spans, the longitudinal stiffness of the pier, the layout of track resistance and bridge support on the expansion and contraction force of CWR are researched.
Research conclusions: (1) The rail expansion and contraction force increases with the increase of simply supported steel truss spans. For a multi-span 100 m simply supported steel truss bridge, only 8 spans can be taken for calculation. (2) With the increase of longitudinal stiffness of simply supported steel truss pier, both rail expansion and contraction force and pier force of simply supported steel truss bridge increase. In order to reduce the rail expansion and contraction force and pier force, the longitudinal stiffness of simply supported steel truss should not be too large. (3) The rail expansion and contraction force could be reduced by 52.95% after small resistance fasteners laid on the simply supported steel truss. (4) In order to reduce the rail expansion and contraction force and pier force of simply supported steel truss, the adjacent simply supported concrete box girder and simply supported steel truss should adopt the support arrangement in the same direction. (5) The research results can provide references for the design of continuous welded rail on large-span simply supported steel truss bridge.

Key words： simply supported steel truss bridge continuous welded rails (CWR) finite element model expansion and contraction force design parameters

Received: 08 October 2021

PACS:

U213.91

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	Articles by authors
	XU Hao
	LIN Hongsong
	TIAN Chunxiang
	CAI Wenfeng

Cite this article:

XU Hao,LIN Hongsong,TIAN Chunxiang, et al. Research on the Influence Factors of Expansion and Contraction Force of CWR on 100 m Simply Supported Steel Truss Bridge[J]. Journal of Railway Engineering Society, 2022, 39(2): 46-51.

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https://tdgcxb.crec.cn/EN/ OR https://tdgcxb.crec.cn/EN/Y2022/V39/I2/46

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