中南大学学报（自然科学版）2023，Vol.54Issue(12)：4933-4945,13.DOI:10.11817/j.issn.1672-7207.2023.12.029
列车循环荷载下完全装配式无砟轨道结构疲劳性能试验研究
Experimental study on fatigue performance of fully assembled ballastless track structure under vehicle cyclic load
摘要
Abstract
In order to study the fatigue performance of a fully assembled ballastless track structure under train load,the fatigue test of its full-scale model was carried out by simulating cyclic train load.During different fatigue cycles,gradient-based load tests were interspersed to obtain the evolution of the track structure system's deformation,vibration,and mechanical characteristics.Considering the cyclic effect of fatigue loading,mechanical models of train load-compression for the rubber and damping cushion under the rail were established.The results show that due to the increased stiffness and damping of the fastener system,after 1 million fatigue loads,the vertical vibration levels of the track plate and track plate are reduced by 22.3%and 9.3%,respectively.After 3 million fatigue loads,the dynamic and static stiffness of the fastener system increases by 7.3%and 12.1%,respectively.The dynamic and static stiffness of the damping pad increases by less than 15%.The acceleration of the short plate of the base increases nonlinearly by about 21.5%,and the vibration attenuation rate of the damping cushion remains at 70%.The maximum longitudinal static strain of the track plate increases by 10.3%.The overall strain level of the base plate is low.The maximum increase in dynamic strain is less than 7%.There is no microcrack evidence in the track structure.关键词
完全装配式无砟轨道/足尺疲劳试验/力学特性Key words
fully assembled ballastless track/full scale fatigue test/mechanical properties分类
交通工程引用本文复制引用
苗帅杰,钟阳龙,高亮,蔡小培,肖一雄,张芷寒..列车循环荷载下完全装配式无砟轨道结构疲劳性能试验研究[J].中南大学学报（自然科学版）,2023,54(12):4933-4945,13.基金项目
中央高校基本科研业务费专项资金资助项目(2022JBQY009) （2022JBQY009）
交通运输行业重点科技项目(2020-MS1-036) （2020-MS1-036）
山东省交通运输厅科技计划项目(2020B42)(Project(2022JBQY009)supported by the Fundamental Research Funds for the Central Universities （2020B42）
Project(2020-MS1-036)supported by the Key Science and Technology Program in the Transport Sector （2020-MS1-036）
Project(2020B42)supported by Science and Technology Program of Shandong Provincical Department of Transportation) （2020B42）
