400km/h高速铁路桥梁竖向刚度限值研究

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Abstract To investigate the vertical stiffness limit of 400 km/h high-speed railway bridge, firstly, the vertical deflection limit of different bridge spans at 400km/h is obtained by fitting the vertical deflection limit under different speed in the code. Then, the vertical stiffness of different bridges is achieved by adjusting the vertical moment of inertia of the cross section. Considering the influence of vertical temperature deformation, the train bridge coupling vibration analysis is carried out, and the vehicle vertical acceleration under different vertical stiffness of the bridge is obtained. Finally, according to the code, the vertical deflection and girder-end rotation can be obtained by loading at the most unfavorable position of the bridge. When the vehicle vertical acceleration reaches the limit value, the limit of vertical deflection and girder-end rotation can be obtained and compared with the limit value of the code. The results show that the vertical deflection limit of the 400km/h high-speed railway bridge can use the deflection limit obtained by fitting from the current standard, and the vertical girder-end rotation limit can still use the current standard limit.
Key words: 400km/h high-speed railway; train-bridge coupling; ZK load; vertical deflection limit; limit of girder-end rotation

Key words： 400km/h high-speed railway train-bridge coupling ZK load vertical deflection limit limit of girder-end rotation

Received: 21 April 2021 Published: 28 July 2022

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	Articles by authors
	XIANG Huoyue1
	CHEN Xuli1
	ZHANG Ling2
	LI Yongle1

Cite this article:

XIANG Huoyue1,CHEN Xuli1,ZHANG Ling2, et al. Vertical stiffness limit of a 400 km/h high-speed railway bridge[J]. JOURNAL OF VIBRATION AND SHOCK, 2022, 41(14): 114-120.

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http://jvs.sjtu.edu.cn/EN/ OR http://jvs.sjtu.edu.cn/EN/Y2022/V41/I14/114

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