Full Text:   <435>

Summary:  <148>

CLC number: U213.2

On-line Access: 2018-12-03

Received: 2018-03-12

Revision Accepted: 2018-09-07

Crosschecked: 2018-11-27

Cited: 0

Clicked: 779

Citations:  Bibtex RefMan EndNote GB/T7714

 ORCID:

Zui Chen

https://orcid.org/0000-0001-9317-0591

Jie-ling Xiao

https://orcid.org/0000-0002-4692-7464

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Journal of Zhejiang University SCIENCE A 2018 Vol.19 No.12 P.939-950

http://doi.org/10.1631/jzus.A1800162


Effects of initial up-warp deformation on the stability of the CRTS II slab track at high temperatures


Author(s):  Zui Chen, Jie-ling Xiao, Xiao-kai Liu, Xue-yi Liu, Rong-shan Yang, Juan-juan Ren

Affiliation(s):  MOE Key Laboratory of High-speed Railway Engineering, Southwest Jiaotong University, Chengdu 610031, China; more

Corresponding email(s):   xjling@swjtu.cn

Key Words:  High-speed railway, China Railway Track System type II (CRTS II) slab track, Initial up-warp, High temperature, Stability


Zui Chen, Jie-ling Xiao, Xiao-kai Liu, Xue-yi Liu, Rong-shan Yang, Juan-juan Ren. Effects of initial up-warp deformation on the stability of the CRTS II slab track at high temperatures[J]. Journal of Zhejiang University Science A, 2018, 19(12): 939-950.

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author="Zui Chen, Jie-ling Xiao, Xiao-kai Liu, Xue-yi Liu, Rong-shan Yang, Juan-juan Ren",
journal="Journal of Zhejiang University Science A",
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pages="939-950",
year="2018",
publisher="Zhejiang University Press & Springer",
doi="10.1631/jzus.A1800162"
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%T Effects of initial up-warp deformation on the stability of the CRTS II slab track at high temperatures
%A Zui Chen
%A Jie-ling Xiao
%A Xiao-kai Liu
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%A Rong-shan Yang
%A Juan-juan Ren
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%I Zhejiang University Press & Springer
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T1 - Effects of initial up-warp deformation on the stability of the CRTS II slab track at high temperatures
A1 - Zui Chen
A1 - Jie-ling Xiao
A1 - Xiao-kai Liu
A1 - Xue-yi Liu
A1 - Rong-shan Yang
A1 - Juan-juan Ren
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DOI - 10.1631/jzus.A1800162


Abstract: 
initial up-warp deformation is one of the key factors that affect the stability of the china Railway Track System type II (CRTS II) slab track. Through modeling analysis, we studied the effects of different initial up-warp conditions on the deformation and stability of a slab track at high temperatures. Based on the theory of ‘variable span length’ in continuous welded rail (CWR), a vertical stability analysis model of the CRTS II slab track was established using the finite element method (FEM), and a scale model test was conducted. The effects of initial up-warp deformation features, such as rise displacement, span length, and line type on the stability of track slabs at high temperatures were studied through simulation. Results showed that the trends of vertical displacement were almost the same based on the FEM, analytical method, and on-site testing, but there was a better agreement between results from the FEM and the analytical method. When the span length was 6.5 m and the rise displacement of the initial up-warp reached 15 mm, compressional destruction was most likely to occur on the concrete at the bottom of the apex. The rise-span ratio of the slab up-warp reached its maximum when the initial up-warp span was 6.5 m at high temperatures. It is easier for track slabs to maintain their original form at a high temperature when there is an angle at the apex or a smooth boundary. However, with a smooth boundary, the concrete at the bottom of the apex is more likely to suffer compressional destruction. Therefore, to ensure the stability of the CRTS II slab track, an initial up-warp with a span of 6.5 m and a rise of 15 mm should be avoided, and the effects of different line types of the initial up-warp also need to be considered.

This is an interesting work on vertical stability analysis model of CRTS II Slab Track based on the theory of "variable span length" in continuous welded rail (CWR) and finite element method (FEM). Results show that when span length is 6.5m, and rise displacement of initial up-warp reaches 15mm, compressional destruction is most susceptible to occur on the concrete at the bottom of the apex.

初拱变形对CRTSII型板式轨道高温稳定性影响研究

目的:初拱变形是影响CRTSII型板式轨道垂向稳定性的关键因素之一. 通过建模分析,深入研究初拱变形的不同特征量,即矢度、弦长和线型,对其受力变形及高温稳定性的影响.
方法:基于变波长变形曲线建立CRTS II型板垂向稳定性分析理论,开展缩尺模型试验验证,并通过有限元法进行计算仿真.
结论:有限元法、解析法与现场试验所得垂向上拱位移的变化趋势一致,有限元法与解析法结果吻合更好. 轨道板初拱弦长为6.5 m且初拱矢度超过15 mm时,拱顶处下缘混凝土最易发生受压破坏. 在高温环境下,初拱弦长为6.5 m的轨道板上拱矢跨比最大. 拱顶存在折角、初拱段边界平滑的轨道板在高温环境下更容易保持原有形态,但后者于拱顶处下缘的混凝土更容易发生受压破坏. 故为确保CRTS II型板的稳定性,应避免弦长达到6.5 m且矢度超过15 mm的初始上拱,另需关注不同初拱线型对轨道板上拱的影响.

关键词:高速铁路;CRTS II型板式轨道;初拱变形;高温;稳定性

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