千米级铁路悬索桥列车荷载加载长度研究

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Abstract Research purposes:When the main span length of kilometer level railway suspension bridge exceeds the maximum train formation length of the railway line, it is necessary to study the reasonable train loading length because the loading mode of the full bridge loaded by train load is not conformity with the actual train load during the service period of the bridge. A railway suspension bridge under construction is taken as the research object, the influence lines of internal force and displacement of the main components are calculated by finite element method. Based on the actual train length, the influence of train loading length on the force characteristics of each component is studied.
Research conclusions:(1) The internal force and displacement influence lines of main cables, suspender and main towers are all positive or negative within the range of main span; The positive length of main truss and lateral bracing internal force influence line and the positive length of the stiffness beam displacement influence line are about half of the length of the main span; The internal force influence line values of sway bracing and bridge decking have peaks in about five inter-section ranges near them. (2) With the increase of the loading length of the train, the increase range of internal forces and displacements of members decreases gradually. (3) Considering the actual train length and the variation rule of stress characteristics of members with the loading length, it is suggested that the train load loading length of suspension bridges should be 550 m. (4) The research results can provide guidance for theoretical research and engineering design of kilometer level suspension bridge.

Key words： bridge engineering suspension bridge kilometer level train load loading length influence line

Received: 13 August 2021

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	Articles by authors
	LU Wenliang
	PI Fuyan
	CHEN Liangjiang
	ZHOU Yongzheng

Cite this article:

LU Wenliang,PI Fuyan,CHEN Liangjiang, et al. Research on the Train Loading Length on Kilometer Level Railway Suspension Bridge[J]. Journal of Railway Engineering Society, 2022, 39(1): 33-38.

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https://tdgcxb.crec.cn/EN/ OR https://tdgcxb.crec.cn/EN/Y2022/V39/I1/33

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