Viscoelastic performance of CA mortar in prefabricated slab track

被引：1
|
作者：
Ren J. [1 ,2 ]
Li H. [1 ,2 ]
Du W. [1 ,2 ]
Deng S. [1 ,2 ]
Tian G. [1 ,2 ]
Wu J. [3 ]
机构：
[1] MOE Key Laboratory of High-speed Railway Engineering, Southwest Jiaotong University, Chengdu
[2] School of Civil Engineering, Southwest Jiaotong University, Chengdu
[3] China Railway Eryuan Engineering Group Co.Ltd., Chengdu
来源：
Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | 2019年 / 50卷 / 03期
基金：
中国国家自然科学基金;
关键词：
CA mortar; Prefabricated slab track; Time hardening rate; Viscoelasticity;
D O I：
10.11817/j.issn.1672-7207.2019.03.030
中图分类号：
学科分类号：
摘要：
To study the viscoelastic deformation laws of CA mortar with different initial Young’s modulus under cyclic train loads, the viscoelastic parameters of mortar were fitted according to the equation of time hardening rate, and the model of CRTS I slab track was established through ABAQUS, based on the viscoelasticity theory and the strain analysis of time hardening rate. The results show that the viscoelastic performance of mortar can be described well with the model of time hardening rate, and the fitted viscoelastic parameters are reasonable. With the increase of the initial Young’s modulus of mortar, the strain difference of mortar before and after its deforming gradually decreases, while its displacement difference increases gradually ranging from 0.2 mm to 0.6 mm. The deformation is mainly distributed on the slab end, which is about 2.5 times of the fastening spacing longitudinally. The viscoelastic performance of mortar produces an irreversible deformation, which plays a significant role in leading to the contact loss between the mortar layer and the track slab. © 2019, Central South University Press. All right reserved.
引用
收藏
页码：743 / 751
页数：8
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