Stress and deformation characteristics of end stab behind abutment of longitudinally connected slab ballastless track on bridge under extreme temperature load

被引：0

作者：

Li W. ^{[1
]}

Gou H. ^{[1
]}

Yang H. ^{[2
]}

Huang A. ^{[3
]}

Zheng X. ^{[4
]}

Zhao H. ^{[1
]}

机构：

[1] School of Civil Engineering, Southwest Jiaotong University, Chengdu

[2] Beijing—Shanghai High Speed Railway Co. Ltd., Beijing

[3] Shanghai High Speed Railway Infrastructure Section, China Railway Shanghai Bureau Group Co. Ltd., Shanghai

[4] Railway Engineering Research Institute, China Academy of Railway Sciences Co. Ltd., Beijing

来源：

Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | 2023年 / 54卷 / 10期

关键词：

bridge-subgrade transition section; deformation characteristics; extreme temperature; longitudinally connected slab ballastless track; stress; Π-type end stab anchorage system;

D O I：

10.11817/j.issn.1672-7207.2023.10.036

中图分类号：

学科分类号：

摘要：

In order to study the interaction between the structural components of the Π-type end stab anchorage system behind the abutment under the extreme temperature load, the end stab area of a general section of a high-speed railway was taken as the research object. A refined numerical simulation model of the longitudinally connected slab ballastless track in the bridge-subgrade transition section was established via ABAQUS to analyze the stress and deformation characteristics of the track structure, friction plate, transition plate and end stab at high temperature and in severely cold conditions. Afterwards, the development mechanism of typical structural damage in the end stab area, such as juncture separation and anchorage system voids, was clarified. The results show that under the extreme temperature load, the maximum longitudinal stress is distributed in the transition plate. The vertical deformation trend of the friction plate is consistent with that of the base plate, and the longitudinal displacement on the top of the end stab decreases as it is closer to the abutment. The end stab anchorage system is greatly affected by the wide-narrow joint of the upper track structure, and the longitudinal compressive stress and tensile stress on the corresponding sections of the friction plate and transition plate increase sharply at high temperature and in severely cold conditions, respectively. The "high temperature-severe cold" cycle causes the seams and extrusion cracks at the juncture between the transition plate and the subgrade support layer. Simultaneously, due to the excessive deformation of the anchorage system under the extreme temperature load, the friction plate, the end stab and the surrounding subgrade soil have voids at the contact interface, and the longitudinal voids are more significant than the vertical voids. © 2023 Central South University of Technology. All rights reserved.

引用

页码：4201 / 4209

页数：8

共 19 条

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