Test Method of Fastener Dynamic Stiffness Based on Continuous Elastic Foundation Beam Model

被引：0
|
作者：
Yan Z. [1 ,2 ]
机构：
[1] State Key Laboratory for Track Technology of High-Speed Railway, Beijing
[2] Railway Engineering Research Institute, China Academy of Railway Sciences Corporation Limited, Beijing
来源：
Zhongguo Tiedao Kexue/China Railway Science | 2022年 / 43卷 / 01期
关键词：
Bending vibration; Continuous elastic foundation beam model; Dynamic stiffness; Fastener; High-speed railway track structure; Rail; Test method;
D O I：
10.3969/j.issn.1001-4632.2022.01.05
中图分类号：
学科分类号：
摘要：
In order to determine the dynamic stiffness of the track fastener in service, the rail was regarded as a simply supported beam set on a continuous elastic foundation, and the calculation formula of fastener dynamic stiffness was deduced. A test method for the dynamic stiffness of fastener was proposed based on the continuous elastic foundation beam model and the track fastener dynamic stiffness of a high-speed railway line in service was tested. The results show that the fastener dynamic stiffness is determined by the frequency and vibration length of the rail first-order bending vibration, the mass per unit length and bending stiffness of the rail and the support spacing of the fastener. When the track structure is determined, the dynamic stiffness of the fastener can be obtained by testing the first-order bending vibration frequency of the rail, and the error of the calculation formula is less than 10% when the vibration frequency is less than 450 Hz. The fastener dynamic stiffness of CRTS Ⅱ slab ballastless track in service of a high-speed railway line is 36.5 kN · mm-1, which is about 1.62 times of the static stiffness of the baseplate pad. © 2022, Editorial Department of China Railway Science. All right reserved.
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页码：38 / 43
页数：5
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