摘要
CRTSⅠ型板式无砟轨道在我国桥上无缝线路中应用广泛,在长期梁轨纵向相互作用下,凸台周围出现离缝,影响轨道结构传力特性。为分析凸台受力优化方法,基于梁轨纵向相互作用基本原理,建立3×32 m简支梁桥上CRTSⅠ型板式无砟轨道无缝线路空间纵向相互作用有限元模型,分析扣件纵向阻力和树脂刚度对离缝最大值的影响,以满足Ⅰ级伤损提出了合理的参数取值范围。结果表明:(1)相同扣件纵向阻力工况下,温降荷载作用时离缝最大值均较温升荷载作用时增大超过10%,温降荷载为离缝最大值控制荷载;(2)采用小阻力扣件可有效减小凸台离缝,为满足Ⅰ级伤损,扣件纵向阻力r≤7 kN/m/轨;(3)增大树脂刚度也可有效减小凸台离缝,常阻力扣件条件下,增大树脂刚度不满足Ⅰ级伤损,小阻力扣件条件下,当树脂刚度≥51 kN/mm时即满足Ⅰ级伤损。
The CRTSⅠ slab track is widely used in continuous welded rail on bridge in our country. Under the long-term longitudinal interaction between bridge and rail, debonding appears around the lug boss, which affects the force transfer characteristics of track structure. In order to analyze the force optimization method of lug boss, the finite element model of space longitudinal interaction of continuous welded rail of CRTSⅠ slab ballastless track on 3×32 m simply supported beam bridge is established based on the basic principle of longitudinal interaction between bridge and rail. The influence of fastener longitudinal resistance and resin stiffness on the maximum value of debonding is analyzed, and reasonable parameter range is proposed to meet the requirements of grade I damage. The results show that:(1) Under the same fastener longitudinal resistance condition, the maximum value of the debonding under the temperature drop load is over 10% higher than that under the temperature rise load. Therefore, the temperature drop load is the control load of the maximum value of the debonding.(2) Utilizing fastener with small resistance can effectively reduce the debonding of lug boss, and the longitudinal resistance of the fastener should be ≤7 kN/m/rail to satisfy grade I damage.(3) Increasing the resin stiffness can also effectively reduce the debonding of lug boss. Under the condition of fastener with constant resistance, increasing the resin stiffness does not meet the requirements of grade I damage. While under the condition of fastener with small resistance, the grade I damage can be satisfied when the resin stiffness is ≥51 kN/mm.
作者
王森荣
郭杰
杨荣山
WANG Senrong;GUO Jie;YANG Rongshan(China Metro Siyuan Survey and Design Group Co.,Ltd.,Wuhan 430063,China;MOE Key Laboratory of High-speed Railway Engineering,Southwest Jiaotong University,Chengdu 610031,China)
出处
《铁道标准设计》
北大核心
2022年第6期17-21,共5页
Railway Standard Design
基金
铁路轨道安全服役湖北省重点实验室开放课题(2020K157-1)。
关键词
无砟轨道
凸台
离缝
优化
扣件纵向阻力
树脂刚度
高速铁路
ballastless track
lug boss
debonding
optimization
fastener longitudinal resistance
resin stiffness
high speed railway
