摘要
以CRTSⅡ型板式无砟轨道为例,利用有限元法及混凝土伤损理论,建立静力学非线性空间耦合模型,分析不同工况下轨道板上拱情况,提出基于轨面高低变化量和轨-板高差变化量的轨道板上拱评估方法,推导建立了利用轨面高低变化量、轨-板高差变化量和整体升温幅度判别离缝宽度的数学表达关系式。结果表明:轨面高低变化量与离缝宽度呈线性关系,轨-板高差变化量与离缝宽度呈二次非线性关系;当离缝宽度较小时,整体升温幅度不作为敏感指标;离缝宽度2 mm时,轨面高低变化量、轨-板高差变化量分别为1.3、0.8 mm;离缝宽度3 mm时,轨面高低变化量、轨-板高差变化量分别为2.0、1.1 mm。
Taking CRTSⅡballastless slab track as an example,a static nonlinear spatial coupling model was established by using the finite element method and concrete damage theory.The camber deformation of track slab under different working conditions was analyzed,and the camber deformation evaluation method of track slab was proposed based on the variation of rail surface height and the variation of rail-slab height difference.Then,the mathematical expression of judging the gap width by using the change of rail surface height,the change of rail plate height difference and the overall temperature rise was deduced and established.The results show that there is a linear relationship between the height change of rail surface and the gap width,and a quadratic nonlinear relationship between the rail-slab height difference and the gap width.When the gap width is small,the overall temperature rise is not used as a sensitive index.When the gap width is 2 mm,the changes of rail surface height and rail-slab height difference are 1.3 mm and 0.8 mm respectively.When the gap width is 3 mm,the changes of rail surface height and rail-slab height difference are 2.0 mm and 1.1 mm respectively.
作者
朱星盛
ZHU Xingsheng(Beijing-Shanghai High Speed Railway Co.Ltd.,Bejing 100038,China)
出处
《铁道建筑》
北大核心
2022年第5期27-31,共5页
Railway Engineering
基金
中国国家铁路集团有限公司科技研究开发计划(K2020G007)。
关键词
无砟轨道
轨道板上拱
评估方法
离缝宽度
回归分析
ballastless track
camber deformation of track slab
evaluation method
gap width
regression analysis
