scholarly journals Interface damage analysis of CA mortar layer of the CRTS II ballastless slab track under temperature gradient loads

2017 ◽  
Vol 48 (1) ◽  
pp. 79-86 ◽  
Author(s):  
ChunFa ZHAO ◽  
JianChao LIU ◽  
HaiHe MAO ◽  
RuiJin XIAO
Keyword(s):  
Temperature Gradient ◽  
Damage Analysis ◽  
Slab Track ◽  
Interface Damage ◽  
Ca Mortar

Influences of CA Mortar Elastic Modulus on Stress and Deformation of Slab Track in High Speed Railway

2011 ◽  
Vol 197-198 ◽  
pp. 1480-1485 ◽  
Author(s):  
Rong Chen ◽  
Wang Ping ◽  
Zhe Liu
Keyword(s):  
Elastic Modulus ◽  
Temperature Gradient ◽  
High Speed ◽  
Plate Theory ◽  
Base Plate ◽  
High Speed Rail ◽  
Slab Track ◽  
The Common ◽  
Ca Mortar ◽  
Track Slab

CA mortar is a key component of slab track. It is used as the material for leveling damping structure layer between the rigid track slab and concrete trackbed of slab track in high speed rail. In order to determine functions of CA mortar with low elastic modulus (EM), the beam/plate theory on elastic foundation was applied to the calculation of slab track’s stress. Under the bonding or no-bonding condition, the influence of CA mortar’s EM on the warping stress and displacement of track slab were calculated. Stress distribution of CA mortar under the common effects of train load and temperature gradient was explored, and the intensity requirement of CA mortar with different EM was put forward. Calculation results show that longitudinal and lateral bending moments of base plate both increase with the increasing of CA mortar’s EM; when the CA mortar’s EM is in the range of 50～10000MPa, there is gap between track slab and the mortar and the deformation of CA mortar (50mm thick) is not enough to compensate the warpage of the track slab; with the increasing of CA mortar’s EM, the tensile and compressive stresses of CA mortar both increase under the common effects of train load and temperature gradient, thus higher requirements on tensile and compressive strength are demanded when CA with high elastic modulus is used.

scholarly journals Interface damage analysis of composite hat-stiffened panels

2021 ◽  
Vol 1948 (1) ◽  
pp. 012139
Author(s):  
Tao Wang ◽  
Ruixiang Bai ◽  
Changlong Wei ◽  
Xiaodi Huang ◽  
Heshan Bai
Keyword(s):  
Damage Analysis ◽  
Stiffened Panels ◽  
Interface Damage

Interface damage and arching mechanism of CRTS II slab track under temperature load

2021 ◽  
Vol 291 ◽  
pp. 123258
Author(s):  
Xuhao Cui ◽  
Bowen Du ◽  
Hong Xiao ◽  
Rui Zhou ◽  
Gaoran Guo ◽  
...  
Keyword(s):  
Slab Track ◽  
Interface Damage ◽  
Temperature Load

Compression Fatigue Characteristics of CA-Mortar for Slab Track

2016 ◽  
Vol 54 (9) ◽  
pp. 948-952
Author(s):  
T. Takahashi ◽  
Y. Momoya ◽  
H. Tanigawa
Keyword(s):  
Slab Track ◽  
Fatigue Characteristics ◽  
Ca Mortar

Study on Spatial Mechanical Characteristic of High-Speed Railway Ballastless Slab Track on Subgrade

2012 ◽  
Vol 503-504 ◽  
pp. 1010-1015 ◽  
Author(s):  
Qing Yuan Xu ◽  
Bin Li
Keyword(s):  
Temperature Gradient ◽  
Mechanical Characteristic ◽  
High Speed ◽  
Three Dimensional ◽  
Calculation Model ◽  
Slab Track ◽  
Combined Load ◽  
Railway Line ◽  
Spring Element ◽  
Ballastless Track

By using beam element to model rail, spring element to model fastener, solid element to model different components of ballastless track, contact element to model the connection between each component of ballastless track, a statics three-dimensional nonlinear finite element mechanical model for calculating the forces transmission among rail, fastening and different component of ballastless slab track on subgrade was established. Experimental data of Suining-Chongqing railway line was given to validate the calculation model. Force of ballastless slab track on subgrade under gravity load, train load, uneven settlement load, temperature gradient load as well as combined load was analyzed. Results show that: spatial forces characteristic of ballastless slab track is very notable under train load; uneven settlement load as well as temperature gradient load has significant influence on the mechanical characteristic of ballastless slab track; force of ballastless slab track increases significantly under combined load than that of under any single load.

Characteristic of Longitudinal Coupled Prefabricated Slab Track (LCPBT): Numerical Simulation Analysis of Uneven Sub Grade Performance

2014 ◽  
Vol 501-504 ◽  
pp. 474-479
Author(s):  
Workuha Dagnew Assefa ◽  
Juan Juan Ren
Keyword(s):  
High Speed ◽  
Simulation Analysis ◽  
Structural Characteristics ◽  
Base Plate ◽  
Slab Track ◽  
Track System ◽  
Low Degree ◽  
Grade Performance ◽  
Ca Mortar ◽  
Consolidation Time

With in the development of high-speed railway countrys China is one of the competent use of ballast less track spreader and largely applied on sub grade, in order to ensure high speed, safe and comfortable run of the train, the sub grade structure must provide smoother and more stable support for the upper track structure, but the problems caused by non uniformity sub grade structure performance are increasingly prominent. There have many serious problems such as low precision of measurement, low degree of automation, compaction mechanism, sometimes consolidation time and high interference of human factors. This paper described as the structural characteristics of longitudinal coupled prefabricated slab track System similar to bögl from German, a model for static analysis has been developed. Based on the model, the slab track element is presented. This element includes rail, rail fastening, prefabricated slab, CA mortar, and base plate and sub grade.

scholarly journals Contact Loss beneath Track Slab Caused by Deteriorated Cement Emulsified Asphalt Mortar: Dynamic Characteristics of Vehicle-Slab Track System and Prototype Experiment

2016 ◽  
Vol 2016 ◽  
pp. 1-12 ◽  
Author(s):  
Dan Liu ◽  
Yu-feng Liu ◽  
Juan-juan Ren ◽  
Rong-shan Yang ◽  
Xue-yi Liu
Keyword(s):  
Dynamic Characteristics ◽  
Railway Track ◽  
Fem Model ◽  
Slab Track ◽  
Operation Speed ◽  
Track System ◽  
Emulsified Asphalt ◽  
Ca Mortar ◽  
Asphalt Mortar ◽  
Track Slab

The contact loss beneath track slab caused by deteriorated cement emulsified asphalt mortar (CA mortar) has been one of the main diseases occurring in the CRTS- (China Railway Track System-) I Slab Track of high-speed railway in China. Based on the slab track design theory and the vehicle-track coupling vibration theory, a vehicle-track vertical coupling dynamic FEM model was established to analyze the influence of the contact loss length on the dynamic characteristics of vehicle and track subsystems at different train speeds. A prototype dynamic characteristic experimental test of CRTS-I Slab Track with CA mortar contact loss was conducted to verify the FEM model results. The train load was generated by the customized ZSS50 excitation car. The results showed that when the operation speed is less than 300 km/h, the contact loss with length smaller than 2.0 m barely affects the running smoothness ride safety of vehicle. The contact loss length effect on the dynamic characteristics of track subsystem is pronounced, especially on the track slab. Once the contact loss beneath the track slab occurs, the vibration displacement and the acceleration of the track slab increase rapidly, while it has little influence on the displacement and acceleration of the concrete roadbed.

Research and Progress on CA Mortar Emulsifying Asphalt of Ballast-Less Slab Track

2011 ◽  
Vol 239-242 ◽  
pp. 2399-2402 ◽  
Author(s):  
Ming Chao Qi ◽  
Xiao Xuan Li ◽  
Zhong Qi Jia
Keyword(s):  
Primary Structure ◽  
High Speed ◽  
Track Structure ◽  
Structure Form ◽  
High Speed Railway ◽  
Slab Track ◽  
Ca Mortar

Ballast-less slab track is the primary structure form of the modern high-speed railway, and cements phalt mortar is the most important component of flexible adjusting layer of slab track structure. This article introduces simply development and application of ballast-less track，then detailed explain the production and research of cements phalt mortar special asphalt lotion .

Structural damage analysis of CRTS Ⅱ slab track with various interface models under temperature combinations

2022 ◽  
pp. 106029
Author(s):  
Rui Zhou ◽  
Xuan Zhu ◽  
Jiaqi Huang ◽  
Haijun Zhou ◽  
Hanlin Liu ◽  
...  
Keyword(s):  
Structural Damage ◽  
Damage Analysis ◽  
Slab Track ◽  
Interface Models
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