纵向连接式浮置板轨道疲劳性能试验研究

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Abstract Research purposes:Compared with urban rail transit, suburban railway trains run faster and have greater axle load. Up to now, there is no precedent for domestic suburban railway to use steel spring floating slab track at a speed of 160 km/h, and no systematic research has been carried out on its adaptability under the operating conditions of suburban railway. In order to design and develop steel spring floating slab track suitable for suburban railway, fatigue tests of full-scale models are carried out, the changes of mechanical properties before and after fatigue are analyzed, and then the changing rules of static stiffness, stress and strain of longitudinally connected steel spring floating slab track are obtained.
Research conclusions:(1) The vertical displacement of the floating slab track decreases after fatigue test, the average displacement decreases by 2.90% after 2 million times of fatigue and 4.78% after 5 million times of fatigue. (2) The static stiffness of the floating slab track increases nonlinearly after fatigue. The static stiffness of floating slab track was 185.02 kN/mm, 189.11 kN/mm and 192.49 kN/mm respectively before fatigue, after 2 million times of fatigue and 5 million times of fatigue. (3) The strain at the strain measuring point on the center line of the floating slab surface increases after fatigue test, and the maximum strain increases 19.21% and 17.70% after 2 million and 5 million fatigue tests, respectively, compared with that before fatigue. (4) The strain at the strain measuring point on the edge of the floating slab surface decreases after the fatigue test, and the maximum strain after 2 million and 5 million fatigue tests decreases by 2.16% and 3.11%, respectively, compared with that before fatigue. (5) After 5 million times of fatigue, the bonding interface between concrete and precast concrete is in a safe state. (6) The research result has a certain reference value for the design and development of the longitudinally connected steel spring floating slab structure suitable for suburban railways.

Key words： suburban railway steel spring floating slab fatigue test static stiffness stress and strain

Received: 20 December 2022

PACS:

U239.5

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	Articles by authors
	LI Qiuyi
	LI Peicheng
	WANG Weidong
	ZHU Bin
	YANG Shangfu
	ZENG Zhiping

Cite this article:

LI Qiuyi,LI Peicheng,WANG Weidong, et al. Research on the Fatigue Performance of Longitudinally Connected Floating Slab Track before and after Fatigue[J]. Journal of Railway Engineering Society, 2023, 40(2): 35-40.

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https://tdgcxb.crec.cn/EN/ OR https://tdgcxb.crec.cn/EN/Y2023/V40/I2/35

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