Dynamic characterisation of a ballast layer subject to traffic impact loads using three-dimensional sensing stones and a special sensing sleeper

Aikawa, Atsushi

doi:10.1016/j.conbuildmat.2014.06.005

Cited by 36 publications

(13 citation statements)

References 2 publications

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“…The main body including a piezoelectric film has solid cover plates on both surfaces. The cover plates (8 cm × 8 cm) transmit impact load to the main body in cases of impact loads of a running train, thereby preventing sensor breakage [12,27]. Each sensor can measure a load up to a maximum of 10 kN.…”

Section: Field Measurements and Spectral Analysismentioning

confidence: 99%

“…This chapter gives accurate field measurements of the dynamic responses of the ballasted track with a train passage at a sampling frequency of 10 kHz without low-pass filters, using special sensing sleepers and sensing stones produced by the authors [11,12]. Using the measurement effects, the analysis can be done with a focal point on propagation characteristics of dynamic loads inside the ballast layer and vertical natural modes of the ballast layer.…”

Section: Introductionmentioning

confidence: 99%

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Vertical Natural Vibration Modes of Ballasted Railway Track

Aikawa¹

2018

New Trends in Structural Engineering

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Impact loads from running trains induce natural vibration within the ballast layer, which causes ballast deterioration over time. This study measured the natural vibration characteristics of the ballast layer using field measurements, full-scale impact loading experiments and large-scale finite element analysis. Experimental test results indicate that the vibration components in the high-frequency range are dominant in ballast responses under loading and that ballast motions during unloading are mainly induced by vibration components in the low-frequency range, causing large displacement over a long duration. Numerical results indicate that the normal frequency of the vertical elastic vibration mode is detected at approximately 310 Hz and that the rigid-body bounce mode of the ballast layer occurs at one-third of the elastic vibration mode frequency. They coincide substantially with values held by field measurements. Stress acting on the angular part of the ballast is more than 1000 times greater than the average loading stress under the sleeper bottom. The combined structure, which consists of the ballast layer and sleepers, vibrates easily in synchrony with resonance motions induced by the impulse waves. Improvement of the contact condition on the sleeper bottom is expected to decrease the displacement amplitude of ballast gravel, thereby reducing ballast degradation.

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Section: Field Measurements and Spectral Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Vertical Natural Vibration Modes of Ballasted Railway Track

Aikawa¹

2018

New Trends in Structural Engineering

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“…The experimental measurements of the ballast pressure between the sleeper and the ballast and under the trackbed with hydraulic load cells were presented by Liu, Lei, Rose, & Purcell (2017) and Watts, Rose, & Russell (2018). Aikawa (2015) proposes the dynamic pressure measurements of the railway ballast with a special sensing sleeper and a OF ROAD AND BRIDGE ENGINEERING 2 0 1 9/ 1 4 4three-dimensional sensing stone. The foot of sleeper was equipped with 75 impact-loading sensors.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of Railway Trackbed Pressure Distribution Under Dynamic Loading

Sysyn

Kovalchuk

Nabochenko

et al. 2019

BJRBE

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Reliable and durable operation of the railway track under the dynamic load of the rolling stock depends considerably on the ability of the ballast layer to get the load from the sleepers and distribute it to the subgrade. In this paper, the experimental study of the distribution properties of the ballast layer under the impact of dynamic loading depending on the density of the ballast layer is carried out. The ballast behaviour during load cycles is estimated by pressure measurements at the ballast prism base along the axis of a sleeper with simultaneous video observation of the ballast particles movement through transparent sidewalls of the box with crushed stone. Measurements of pressure distribution are carried out with the developed microcontroller system of measurements and developed load cells. The system allows performing multi-point measurements of stress in combination with measurements of acceleration and photogrammetry. The results of measurements showed a significant effect of the ballast layer consolidation on the distribution of stresses under the sleeper. The performed research opens up opportunities for practical improvement of the existing types of track structures and the technology of the ballast layer tamping in terms to provide the optimal conditions for the ballast layer operation.

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“…Substantial researches using analytic methods for rail track have been carried out, for example : the effect of wheel-rail contact forces [17,18] or the vibration of the railway track (by considering the model of a ballasted track with discrete supports [8,9,13,14,1] or the model of the infinite beam placed on a continuous foundation [10,7,6,11]). The studies of each component of the rail track were performed on the rail [19,16,15], or on the ballast [20,22].…”

Section: Introductionmentioning

confidence: 99%

Analytical Model of the Dynamics of Railway Sleeper

Tran¹,

Hoang²,

Forêt³

et al. 2017

Proceedings of the 6th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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Abstract. The periodically supported beam is an analytical model of the dynamics of a railway track, where each rail together with its supports (sleepers) is independent of the other one. However, the sleepers connect the two rails and their behaviour could influence the response. This study develops an analytical model for this type of track by considering the sleepers as EulerBernoulli beams resting on a visco-elastic foundation. By using a relation between the reaction forces and displacement of the periodically supported beam [1], we can obtain a dynamic equation of a sleeper based on Dirac delta distribution. Then, the response of the sleepers can be obtained by using the Green function. This model is a fast method to calculate the dynamic responses of railway sleepers and track.

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Dynamic characterisation of a ballast layer subject to traffic impact loads using three-dimensional sensing stones and a special sensing sleeper

Cited by 36 publications

References 2 publications

Vertical Natural Vibration Modes of Ballasted Railway Track

Vertical Natural Vibration Modes of Ballasted Railway Track

Experimental Study of Railway Trackbed Pressure Distribution Under Dynamic Loading

Analytical Model of the Dynamics of Railway Sleeper

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