期刊文献+

高铁单元板式无砟轨道大跨梁端适应性对比 预览

The Adaptive Contrast Research on the Slab Track of High - speed Railway in Long Span Bridge End
在线阅读 下载PDF
收藏 分享 导出
摘要 研究目的:为研究不同类型单元式无砟轨道无缝线路在大跨桥上的适应性,本文建立无缝线路-无砟轨道-桥梁空间耦合分析模型,对温度荷载作用下CRTSⅠ型和CRTSⅢ型板式无砟轨道各层纵向受力与变形、层间错动位移以及限位结构受力进行对比分析,并对运营过程中可能出现的扣件纵向阻力增加对两种无砟轨道在大跨桥上的适应性进行比较。研究结论:(1)两种无砟轨道无缝线路在连续梁端处受力与变形最大,但二者之间的差异较小;(2)扣件纵向阻力的增加将带来连续梁端位置处无缝线路受力增加,变形量减小;(3)CRTSⅢ型板式无砟轨道层间限位刚度大于CRTSⅠ型板式无砟轨道,因此扣件纵向阻力增加导致的CRTSⅠ型板式无砟轨道层间错动位移增加更加明显;(4)梁端限位结构在升降温过程中纵向受剪明显,其中CRTSⅠ型板式无砟轨道梁端半圆形凸台因单侧承力,纵向剪切效应更加显著,且随桥上扣件纵向阻力的增加而急速增加;(5)总体看来,两种无砟轨道的选用对大跨桥上无缝线路设计的影响基本无差异,但在轨道纵向几何形位保持以及大跨梁端限位结构受力方面,CRTSⅢ型板式无砟轨道表现出了较好的适应性;(6)本研究成果可为今后大跨度桥上板式无砟轨道的选型提供理论指导。 Research purposes: In order to study the adaptability of different types of slab track with CWR at long span bridge, this paper establishes CWR -slab track -bridge spatial coupling model, and analyzes the contrast in longitudinal force and deformation of layers, interlayer shear displacement, load effects of constraint structure and other aspects under temperature loads between CRTS Ⅰ and CRTS Ⅲ slab track. Also, it compares the adaptability of two types of slab track at long span bridge when the longitudinal resistance of fastener increases during the operation process. Research conclusions: ( 1 ) The stress and deformation have the largest change on continuous bridge of two types of slab track with CWR, but the change between the two types of slab track is small. (2) Increasing the longitudinal resistance of fastener will bring increasing load effects on continuous bridge with CWR, and decreasing deformation. (3) CRTS Ⅲ slab track has larger constraint stiffness between layers than CRTS Ⅰ slab track. Increasing longitudinal resistance of fastener brings increasing interlayer shear displacement of CRTS Ⅰ slab track more obvious. (4)The longitudinal shear of constraint structure in bridge end is large during temperature decreasing. Because the semicircular bollard of CRTS I slab track in bridges end has unilateral bearing, the longitudinal shear effect is more significant and rapidly increaseswith the increasing longitudinal resistance of fastener. (5)Overall, there is not a big difference to select either one of two types of slab track in long span bridge with CWR, while CRTS Ⅲ slab track has better performance of adaptability on maintaining its longitudinal geometry and force on bollard in long span bridge end. (6)The research results can provide theoretical guidance for ballastless track selection on large span bridge in the future.
作者 王继军 江成 赵磊 姜子清 WANG Ji -jim, JIANG Cheng, ZHAO Lei, JIANG Zi -qing (China Academy of Railway Sciences, Beijing 100081, China)
出处 《铁道工程学报》 北大核心 2018年第5期18-23,87共7页 Journal of Railway Engineering Society
基金 中国铁路总公司科技研究开发计划课题(2015G001-J,2016G001-A) 中国铁道科学研究院科研基金项目(2016YJ023)
关键词 高速铁路 单元板 大跨度桥梁 温度力 high -speed railway slab track long span bridge temperature force
作者简介 王继军,1971年出生,男,研究员。
  • 相关文献

参考文献8

二级参考文献60

共引文献144

投稿分析

相关作者

内容加载中请稍等...

相关机构

内容加载中请稍等...

相关主题

内容加载中请稍等...

浏览历史

内容加载中请稍等...
;
使用帮助 返回顶部 意见反馈