摘要
随着车速的提高,无砟轨道结构和线下基础应力水平有所提高,无砟轨道荷载分配系数是进行轨道结构和线下基础设计的重要参数。本文以四种无砟轨道为研究对象,采用理论分析和有限元相结合的方法计算无砟轨道荷载分配系数,并分析影响因素。结果表明:轮轨力由5个扣件分担,且无砟轨道类型、线下基础类型和轮轨力大小对扣件荷载分配系数基本无影响,推荐无砟轨道扣件荷载分配系数分别为7%,23%,40%,23%,7%;无砟轨道整体刚度的增大使扣件荷载分配趋于集中,中间扣件荷载分配系数增大显著,对无砟轨道结构受力不利;扣件刚度突变使扣件荷载分配更加趋于集中,当扣件刚度突变值达到700 kN/mm时轮轨力由3个扣件分配,对无砟轨道结构受力更为不利;脱空对扣件荷载分配系数影响很小,可忽略不计。
With the increase of train speed,the stress level of ballastless track structure and track foundation was increased.The load distribution coefficient of ballastless track was an important parameter for the design of track structure and track foundation.In this paper,four kinds of ballastless track were taken as the research object,the load distribution coefficient of ballastless track was calculated by combining theoretical analysis and finite element method,and the influencing factors were analyzed.The results show that the wheel rail force is shared by five fasteners.The type of ballastless track,the type of track foundation and the magnitude of wheel rail force have no effect on the load distribution coefficient of fasteners.The recommended load distribution coefficient of ballastless track fasteners is 7%,23%,40%,23%and 7%respectively.The increase of the overall stiffness of ballastless track causes the fastener load distribution tend to be centralized,and the load distribution coefficient of middle fastener increases significantly,which is unfavorable to the ballastless track structure.The sudden change of fastener stiffness makes the load distribution of fastener more centralized.When the sudden change value of fastener stiffness reaches 700 kN/mm,the wheel rail force is distributed by three fasteners,which is more unfavorable to the ballastless track structure.The effect of cavity on the load distribution coefficient of fastener is negligible.
作者
郭杰
赵坪锐
GUO Jie;ZHAO Pingrui(MOE Key Laboratory of High-speed Railway Engineering,Southwest Jiaotong University,Chengdu 610031,China)
出处
《铁道建筑》
北大核心
2021年第3期103-106,112,共5页
Railway Engineering
基金
国家自然科学基金(U1534203)
关键词
无砟轨道
分配系数
数值模拟
扣件
刚度
脱空
ballastless track
distribution coefficient
numerical simulation
fastener
stiffness
cavity
