400km/h高速铁路桥梁竖向刚度限值研究

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摘要为研究400km/h高速铁路桥梁的竖向刚度限值，首先，将铁路桥涵设计规范中不同车速的竖向挠度限值拟合外推，得到车速400km/h时不同桥梁跨度的竖向挠度限值；然后，调整截面竖向惯性矩，实现不同桥梁竖向刚度，并考虑竖向温度变形影响，进行车桥耦合振动分析，得到不同桥梁竖向刚度下的车辆竖向加速度；最后，按规范要求在桥梁最不利位置加载得到桥梁竖向挠度和梁端转角，车辆竖向加速度达到限值时可获得竖向挠度限值和梁端竖向转角限值，并与规范预测值进行对比；结果表明，400km/h高速铁路桥梁竖向挠度限值可采用现行规范拟合外推得到的挠度限值，梁端竖向转角限值可仍沿用现行规范限值。
关键词：400km/h高速铁路；车桥耦合；ZK荷载；竖向挠度限值；梁端竖向转角限值

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	向活跃1
	陈绪黎1
	张玲2
	李永乐1

关键词 ： 400km/h高速铁路, 车桥耦合, ZK荷载, 竖向挠度限值, 梁端竖向转角限值

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

收稿日期: 2021-04-21 出版日期: 2022-07-28

引用本文:

向活跃1，陈绪黎1，张玲2，李永乐1. 400km/h高速铁路桥梁竖向刚度限值研究[J]. 振动与冲击, 2022, 41(14): 114-120.
XIANG Huoyue1，CHEN Xuli1，ZHANG Ling2，LI Yongle1. Vertical stiffness limit of a 400 km/h high-speed railway bridge. JOURNAL OF VIBRATION AND SHOCK, 2022, 41(14): 114-120.

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http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2022/V41/I14/114

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