Study on the damage evolution of the joint and the arching deformation of CRTS-II ballastless slab track under complex temperature loading

Huang, Yichen; Gao, Liang; Zhong, Yanglong; Zhou, Chenyi

doi:10.1016/j.conbuildmat.2021.125083

Cited by 39 publications

(7 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…6,34 Hence, the strain difference De induced by TBI can be employed to identify the stiffness of the fixing device. However, the monitored strain in the base plate e base is also affected by the temperature of the base plate, as described in Equation (2), where e is the strain induced by TBI and e T is the strain induced by the temperature of the base plate T base :…”

Section: Structural Health Monitoring Of Crts II Slab Trackmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…1 The CRTS II ballastless slab track has the advantages of high regularity, low structural height, and good durability, and it has been widely applied in China high-speed railway (HSR) lines, including Beijing-Tianjin HSR (2008), Beijing-Shanghai HSR (2011), Beijing-Wuhan HSR (2012), Nanjing-Hangzhou HSR (2013), Tianjin-Qinhuangdao HSR (2013), and Shanghai-Kunming HSR (2016). 2,3 Currently, the total mileage of CRTS II ballastless slab track in China is approximately 5000 km. 4 The CRTS II ballastless slab track on multi-span simply supported bridges is mainly composed of continuous-welded rail, prefabricated track slab, cement-emulsified asphalt (CA) mortar layer, cast-inplace concrete base plate, sliding layer, and fixing device.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, the actual stiffness of the fixing device cannot be accurately assumed as ''rigid.'' At present, the mechanical behavior between the track slab and CA mortar and common characteristics such as delamination, 1 the bond-slip constitutive relation, 18 the arching mechanism, 2,13 and the repair methods 3,19,20 have been fully studied. With respect to railway health motoring, the friction performance of sliding layer has been revealed using the monitored strain in base plate at the inner side of the fixing device and the mid-span of bridge.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Stiffness identification of fixing device in CRTS II slab track based on long-term monitoring data

Wang

Lin

et al. 2023

Structural Health Monitoring

View full text Add to dashboard Cite

The fixing device is an important component in the China Railway Track System (CRTS) II slab track, through which the longitudinal force of the track can be transferred to bridges and piers. The stiffness of the fixing device significantly affects the mechanical properties of the track. However, it is difficult to evaluate stiffness using conventional detection methods, because the fixing device is located under the base plate. In this study, the fixing-device stiffness of simply supported bridges was identified using long-term monitoring data and finite element (FE) analysis. First, a monitoring scheme was proposed based on the principle of track–bridge interaction. The strain in the base plate on both sides of the fixing device, as well as the temperature of the base plate and bridge, were obtained from 2015 to 2018. Then, the stiffness of the fixing device was proved to be closely related to the strain difference of the base plate on both sides of the fixing device, and the corresponding nonlinear mapping relationship was established through FE analysis. Finally, the fixing-device stiffness over 4 years was identified using long-term monitoring data and the established mapping function, and the influence of the stiffness degradation on the mechanical property of the track was discussed. This study can provide a reference for the design and maintenance of CRTS II slab tracks on multi-span simply supported bridges.

show abstract

Section: Structural Health Monitoring Of Crts II Slab Trackmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Stiffness identification of fixing device in CRTS II slab track based on long-term monitoring data

Wang

Lin

et al. 2023

Structural Health Monitoring

View full text Add to dashboard Cite

show abstract

“…Moreover, due to the poor thermal conductivity of concrete, there is a vertical temperature gradient in the track structure under the action of solar radiation. The coupling effect of temperature axial force and nonlinear temperature gradient increases the instability of continuous track structure, which is easy to cause repeated warping deformation of track slab, separation of mortar layer, arch of track slab and other diseases [1][2][3][4][5]. It seriously affects the driving safety and track durability, and the maintenance is extremely difficult.…”

Section: Introductionmentioning

confidence: 99%

Vertical Nonlinear Temperature Gradient and Temperature Load Mode of Ballastless Track in China

et al. 2022

View full text Add to dashboard Cite

In the process of heat exchange with the external environment, the internal temperature of ballastless track structure presents a nonlinear distribution. The vertical temperature gradient will cause repeated warping and deformation of track slab, resulting in mortar layer separation, which will affect driving comfort and track durability. The traditional temperature field analysis method of concrete structure based on thermodynamics has the disadvantages of too many assumptions, difficult parameter selection and too much calculation of energy consumption. In this paper, based on the finite element software ANSYS, the heat exchange was transformed into the boundary condition of heat flux, which was applied to the thermodynamic analysis model to study the nonlinear temperature distribution law of ballastless track. The accuracy of the analysis method was verified by the measured data. On this basis, the regional distribution law of temperature gradient of ballastless track under different geographical coordinates and climatic conditions was studied. By adding a regional adjustment coefficient, the vertical temperature load model of ballastless track suitable for typical areas in China was proposed. The proposed temperature load model makes up for the lack of refinement of climate division and temperature load model in relevant specifications, and has strong engineering application and popularization value.

show abstract

Thermal Transfer Effects of CRTS II Slab Track Under Various Meteorological Conditions

Zhou¹,

Yuan²,

Du³

et al. 2023

Lecture Notes in Civil Engineering

View full text Add to dashboard Cite

show abstract

Study on the damage evolution of the joint and the arching deformation of CRTS-II ballastless slab track under complex temperature loading

Cited by 39 publications

References 23 publications

Stiffness identification of fixing device in CRTS II slab track based on long-term monitoring data

Stiffness identification of fixing device in CRTS II slab track based on long-term monitoring data

Vertical Nonlinear Temperature Gradient and Temperature Load Mode of Ballastless Track in China

Thermal Transfer Effects of CRTS II Slab Track Under Various Meteorological Conditions

Contact Info

Product

Resources

About