纵向连接式浮置板轨道疲劳性能试验研究

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摘要 研究目的:相较于城市轨道交通,市域铁路列车运行速度更快、轴重更大,截至目前,国内市域铁路在时速160 km没有采用钢弹簧浮置板轨道的先例,也没有对其在市域铁路运营条件下的适应性开展过系统研究。为设计研发适用于市域铁路的钢弹簧浮置板轨道,本文通过开展足尺模型的疲劳试验,分析疲劳前后力学性能变化,进而得到纵向连接式钢弹簧浮置板轨道静刚度及应力应变的变化规律。
研究结论:(1)疲劳后浮置板垂向位移整体呈下降趋势,200万次疲劳后其位移平均值减小2.90%,500万次疲劳后其位移平均值减小4.78%;(2)疲劳后浮置板静刚度呈增大趋势,疲劳前、200万次疲劳后和500万次疲劳后,浮置板静刚度分别为185.02 kN/mm、189.11 kN/mm、192.49 kN/mm;(3)浮置板表面中线上应变测点位置的应变在疲劳试验后呈现增大趋势,200万次及500万次疲劳试验后其最大应变值较疲劳前分别增大19.21%和17.70%;(4)浮置板表面边线上应变测点位置的应变在疲劳试验后呈现减小趋势,200万次及500万次疲劳试验后的最大应变值较疲劳前分别减小2.16%和3.11%;(5)500万次疲劳后板缝处混凝土与预制板混凝土粘结界面处于安全状态;(6)本研究成果对于设计研发适用于市域铁路的纵向连接式钢弹簧浮置板结构具有一定参考价值。

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	李秋义
	李沛成
	王卫东
	朱彬
	杨尚福
	曾志平

关键词 ：市域铁路, 钢弹簧浮置板, 疲劳试验, 静刚度, 应力应变

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

收稿日期: 2022-12-20

PACS:

U239.5

基金资助:中铁第四勘察设计院集团有限公司科技开发计划项目(2020K028)

作者简介: ** 李秋义,1972年出生,男,正高级工程师,现任中铁第四勘察设计院集团有限公司副总工程师。

引用本文:

李秋义, 李沛成, 王卫东, 朱彬, 杨尚福, 曾志平. 纵向连接式浮置板轨道疲劳性能试验研究[J]. 铁道工程学报, 2023, 40(2): 35-40.
LI Qiuyi, LI Peicheng, WANG Weidong, ZHU Bin, YANG Shangfu, ZENG Zhiping. Research on the Fatigue Performance of Longitudinally Connected Floating Slab Track before and after Fatigue. Journal of Railway Engineering Society, 2023, 40(2): 35-40.

链接本文:

https://tdgcxb.crec.cn/CN/ 或 https://tdgcxb.crec.cn/CN/Y2023/V40/I2/35

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