温度作用下桥墩高差对桥上无缝道岔影响研究

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Abstract Research purposes: In order to study the influence of the pier height difference on the welded turnout on the continuous bridge under the temperature change, this paper takes No.18 turnout on a (40+56+40) m continuous bridge as the research object, establishes the turnout-bridge-pier calculation model, and studies the influence of vertical deformation caused by the height difference of adjacent bridge piers on the stress and irregularity of the welded turnout on the bridge under the action of temperature.
Research conclusions: (1) The temperature rise of bridge pier has basically no effect on the force of welded turnout on the bridge, but has a greater impact on the vertical track irregularity of turnout area. (2) The expansion force of the welded turnout on the bridge increased by 0.54% when the pier temperature rises by 30 ℃. Therefore, the effect of the high difference of the bridge pier could not be considered when checking the longitudinal force of the welded turnout on the bridge. (3) With the increase of pier height difference between adjacent piers of the turnout bridge, the vertical deformation of the rail increases, and the vertical track irregularity deviation on the turnout area increases. (4) When the pier height difference between adjacent piers exceeds 76 m, the vertical track irregularity deviation exceeds the limit of 2 mm using the 10 m string positive sag difference evaluation. (5) The research results could provide reference for the design of welded turnout on continuous bridge with high piers.

Key words： piers height difference welded turnout continuous bridge expansion force track regularity

Received: 18 March 2022

PACS:

U211.5

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	Articles by authors
	LIN Hongsong
	XU Hao
	CAO Bao
	PAN Zili

Cite this article:

LIN Hongsong,XU Hao,CAO Bao, et al. Research on the Influence of Height Difference of Piers on the Welded Turnout on Bridge under Temperature Action[J]. Journal of Railway Engineering Society, 2022, 39(6): 61-66.

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https://tdgcxb.crec.cn/EN/ OR https://tdgcxb.crec.cn/EN/Y2022/V39/I6/61

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