Interface damage and its effect on vibrations of slab track under temperature and vehicle dynamic loads

Zhu, Shengyang; Cai, Chengbiao

doi:10.1016/j.ijnonlinmec.2013.10.004

Cited by 189 publications

(74 citation statements)

References 29 publications

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“…It has wide applications in different research topics such as dynamic characteristics of railway structures, [21][22][23][24][25][26] damage and fracture of track structures, [27,28] evaluation of riding safety and comfort of high-speed vehicles. [29] In this paper, a 3D coupled dynamic model of a vehicle and the FST with DVAs are established to study the effect of the DVAs on vibration attenuations of the FST at low frequencies, as shown in Figure 4.…”

Section: Coupled Dynamic Model Of a Vehicle And The Fst With Dvasmentioning

confidence: 99%

Low-frequency vibration control of floating slab tracks using dynamic vibration absorbers

Zhu

Yang

Hua

et al. 2015

Vehicle System Dynamics

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This study aims to effectively and robustly suppress the low-frequency vibrations of floating slab tracks (FSTs) using dynamic vibration absorbers (DVAs). First, the optimal locations where the DVAs are attached are determined by modal analysis with a finite element model of the FST. Further, by identifying the equivalent mass of the concerned modes, the optimal stiffness and damping coefficient of each DVA are obtained to minimise the resonant vibration amplitudes based on fixed-point theory. Finally, a three-dimensional coupled dynamic model of a metro vehicle and the FST with the DVAs is developed based on the nonlinear Hertzian contact theory and the modified Kalker linear creep theory. The track irregularities are included and generated by means of a time-frequency transformation technique. The effect of the DVAs on the vibration absorption of the FST subjected to the vehicle dynamic loads is evaluated with the help of the insertion loss in one-third octave frequency bands. The sensitivities of the mass ratio of DVAs and the damping ratio of steel-springs under the floating slab are discussed as well, which provided engineers with the DVA's adjustable room for vibration mitigation. The numerical results show that the proposed DVAs could effectively suppress low-frequency vibrations of the FST when tuned correctly and attached properly. The insertion loss due to the attachment of DVAs increases as the mass ratio increases, whereas it decreases with the increase in the damping ratio of steel-springs.

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Section: Coupled Dynamic Model Of a Vehicle And The Fst With Dvasmentioning

confidence: 99%

Low-frequency vibration control of floating slab tracks using dynamic vibration absorbers

Zhu

Yang

Hua

et al. 2015

Vehicle System Dynamics

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“…Results of the shear test reveal the bond strength between asphalt waterproofing layer and concrete base plate. Debonding of the interface is one of the main distresses reducing serviceability and durability of slab track systems [33]. The interface bonding between the asphalt waterproofing layer and the concrete base plate is required to be strong enough to secure the structural integrity and durability of the slab track.…”

Section: Test Results and Discussionmentioning

confidence: 99%

Application of Mastic Asphalt Waterproofing Layer in High-Speed Railway Track in Cold Regions

et al. 2018

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Abstract:Freeze-thaw damage is a typical distress incurred in road and railway engineering in cold regions. Concrete waterproofing layer is commonly used in high-speed railway tracks to prevent the penetration of surface water, however, it cracks easily under thermal stress, especially in cold regions. Recently solutions have been proposed to increase the waterproofing layer's cracking resistance by using asphalt layers. Nonetheless, the use of emulsified asphalt as well as dense-graded asphalt mixture were not effective enough. To improve the effectiveness, in this study, mastic asphalt was designed for application as the waterproofing layer on the subgrade surface of high-speed railway tracks in cold regions. The overall performance of mastic asphalt was preliminarily evaluated by laboratory tests, then a 200-m test section was constructed for field validation in northeastern China as part of a new high-speed railway line, and water content sensors were placed inside the subgrade to monitor the performance of the mastic asphalt waterproofing layer (MAWL). The subsequent field investigation and monitoring data during the two years operation showed that MAWL dramatically outperformed the conventional concrete waterproofing layer in terms of waterproof performance. Plenty of serious cracks were found in the conventional concrete waterproofing layer, but only a limited number of local cracks were observed in MAWL. As a result, MAWL keeps the water content of subgrade at a stable level. In addition, MAWL showed relatively high stability during the two years investigation period, and no obvious deterioration was observed in the test section.

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“…Before testing, the specimens were put into the environmental box for 8 hours at the target temperature until the stable thermal properties of specimens were achieved. Based on the climate in China, the maximum temperature can be found approximately 60°C in surveys related to the service environment of high-speed lines [1,33]. erefore, five temperatures of − 20°C, 0°C, 20°C, 40°C, and 60°C were selected in this paper.…”

Section: Specimensmentioning

confidence: 99%

Temperature Sensitivity of Mechanical Properties of Cement Asphalt Mortar with Nanoparticles

Fan

Wang

2020

Advances in Civil Engineering

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Cement asphalt mortar (CAM) in high-speed lines is subjected to varying environmental conditions, which lead to the deterioration of CAM. e nanoparticles of nano-SiO 2 and nano-TiO 2 are added to improve the performance of CAM, and the temperature sensitivity of CAM with nanoparticles is primarily studied in this paper. e flexural strength and compressive strength of CAM with and without nano-SiO 2 and nano-TiO 2 were measured and compared to study the effect of nanoparticles on the performance of CAM subjected to different temperatures. Temperature sensitivity factors of flexural and compressive strength based on Arrhenius model were proposed to evaluate the temperature dependence of CAM by nanoparticles. Furthermore, the microstructure of hardened CAM was studied using scan electronic microscope (SEM) to investigate the mechanism of temperature sensitivity of CAM with and without nanoparticles. e results indicated that the flexural and compressive strength of CAM with and without nanoparticles decreased with the increasing temperature; however, the decreasing rate of strength with temperature was different in CAM with and without nanoparticles. e reduction in the decreasing rate of strength was obtained by using nano-SiO 2 rather than nano-TiO 2 in CAM. Based on the SEM results, the free asphalt was seen to be greatly reduced in the CAM with nano-SiO 2 , suggesting a positive effect of nano-SiO 2 on the mitigation of temperature sensitivity of CAM.

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Interface damage and its effect on vibrations of slab track under temperature and vehicle dynamic loads

Cited by 189 publications

References 29 publications

Low-frequency vibration control of floating slab tracks using dynamic vibration absorbers

Low-frequency vibration control of floating slab tracks using dynamic vibration absorbers

Application of Mastic Asphalt Waterproofing Layer in High-Speed Railway Track in Cold Regions

Temperature Sensitivity of Mechanical Properties of Cement Asphalt Mortar with Nanoparticles

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