Influence of Variation in Track Support Rigidity Around Overbridges on Ground Vibration

Kato, Shinjiro; Kamohara, Akihiro; Yokoyama, Hidefumi; Iwata, Yuichi

doi:10.2219/rtriqr.55.241

Cited by 5 publications

(3 citation statements)

References 1 publication

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“…The vehicles were assumed to be standard vehicles of Shinkansen high-speed railway and their dynamics characteristics were modeled based on the previous study. 28) The vehicle models had eight cars due to simulation scale constraints. The dynamics characteristics of tracks were modeled based on the previous literature.…”

Section: Reproduction Analyses By Nu-merical Simulationmentioning

confidence: 99%

A Method for Suggesting Countermeasures for Train-Induced Ground Vibrations Using Numerical Simulation

NOYORI,

YOKOYAMA

2024

Journal of JSCE

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There have been many studies on countermeasures for train-induced ground vibration. However, many of the countermeasures are not clear about the mechanisms and reduction values of the vibration. Therefore, in general, we choose the countermeasures based on previous cases or empirical judgments. In this paper, using a numerical simulation consisting of a running train, tracks, supporting structures, and the ground, we investigated a method for extracting primary factors of the train-induced ground vibration and a method for suggesting countermeasures based on the primary factors. The results showed that it is possible to extract the primary factors, which increased the train-induced ground vibration, by evaluating the characteristics of vibration source, vibration characteristics of viaducts, and propagation characteristics of the ground. This study presents a flowchart showing how the primary factors are linked to the countermeasures.

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Section: Reproduction Analyses By Nu-merical Simulationmentioning

confidence: 99%

A Method for Suggesting Countermeasures for Train-Induced Ground Vibrations Using Numerical Simulation

NOYORI,

YOKOYAMA

2024

Journal of JSCE

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“…The VLz was obtained by amending the vibration acceleration level ( VAL ) with z being the weighting factor, which could effectively evaluate the structure vibration characteristics in the frequency domain. The VAL was calculated according to equation (8) (Kato et al, 2014)…”

Section: Dynamic Behavior Of the Systemmentioning

confidence: 99%

Dynamic behavior of a polyurethane foam solidified ballasted track in a heavy haul railway tunnel

Cai

Zhong

Hao

et al. 2018

Advances in Structural Engineering

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Dynamic behavior of a new type of track using the polyurethane foam solidified ballast in heavy haul railway tunnels is comprehensively investigated in this study. First, a dynamic model of the vehicle-track-tunnel interaction system was developed based on the multibody system dynamics theory and finite element method. Then, the dynamic effects of the polyurethane foam solidified ballast track on the train and the surrounding infrastructures were calculated and compared to those of the traditional ballasted track. Moreover, the effects of the elastic modulus and the solidified area size of polyurethane foam solidified ballast on the dynamic behavior were analyzed. Results show that, compared to the traditional ballast bed, polyurethane foam solidified ballast decreases the track stiffness and the vibration acceleration of the tunnel, while does not affect the vehicle safety (derailment coefficient and the rate of wheel load reduction). A larger elastic modulus of polyurethane foam solidified ballast has little effects on the wheel-rail interaction and the vibration acceleration of the tunnel, while a smaller modulus results in amplification of the displacements of rails and sleepers. Considering the vehicle-track interaction and tunnel vibration, the optimal elastic modulus of polyurethane foam solidified ballast is suggested to be 60-80 MPa. In addition, smaller solidified area of polyurethane foam solidified ballast presents lower effects on the vibration reduction and rate of wheel load reduction, while larger area leads to a higher derailment coefficient and cost. Therefore, an optimal solidified area size of polyurethane foam solidified ballast with the top width of 0.85 m is recommended.

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“…It was also found for both vertical and horizontal motions that ground vibration attenuation occurred relatively close to structures and that structural types and ground conditions had a major impact on, among other things, the intensity of ground vibration and attenuation distance. [12] The area near an abutment of an overbridge in an embankment section has structural borders between the embankment, abutment and girder. The area is also where ballast support rigidity changes.…”

Section: Ground Vibrationmentioning

confidence: 99%

<b>Recent Trends in Research and Development on Environmental Engineering</b>

Iida¹

2016

QR of RTRI

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Influence of Variation in Track Support Rigidity Around Overbridges on Ground Vibration

Abstract: Yuichi

Cited by 5 publications

References 1 publication

A Method for Suggesting Countermeasures for Train-Induced Ground Vibrations Using Numerical Simulation

A Method for Suggesting Countermeasures for Train-Induced Ground Vibrations Using Numerical Simulation

Dynamic behavior of a polyurethane foam solidified ballasted track in a heavy haul railway tunnel

<b>Recent Trends in Research and Development on Environmental Engineering</b>

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