A review of spectral analysis for low-frequency transient vibrations

Chen, Chin-Tsun; Chang, Luh‐Maan; Loh, Chin‐Hsiung

doi:10.1177/1461348420942008

Cited by 9 publications

(4 citation statements)

References 25 publications

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“…Developing an accurate estimate of the frequency spectrum of acceleration signals is essential to the assessment of the dynamic properties of ballasted track substructures [40]. The subplots on the right sides of Figure 7 show the analysis results concerning the frequency spectrum derived from the vibration acceleration time histories.…”

Section: Vibration Accelerationmentioning

confidence: 99%

An Analysis of Dynamics of Retaining Wall Supported Embankments: Towards More Sustainable Railway Designs

Feng,

Luo,

Lyu

et al. 2023

Sustainability

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Retaining walls are structures used to retain earth materials on a slope. Typically, they are designed for static loads, but for highway and railway infrastructures, vehicle-induced dynamic responses are also relevant. Therefore, retaining wall structures are often designed with a factor of safety that is higher than necessary, because it can be challenging to quantify the magnitude of expected dynamic stresses during the design stage. This unnecessary increase in material usage reduces the sustainability of the infrastructures. To improve railway retaining wall sustainability, this paper presents the results from a field monitoring campaign on a heavy-haul rail line with a retaining wall, studying the dynamics induced in response to 30-ton axle load trains running at speeds of between 5 km/h and 100 km/h. The site comprises an earth embankment supported by a gravity retaining wall, with accelerometers on the sleepers, roadbed surface, and retaining wall, velocity sensors on the roadbed, and strain gauges on the rail web to record wheel–rail forces. The vibration intensities collected from various locations are processed to explore the peak particle velocities, maximum transient vibration values, and one-third octave band spectrums. Two transfer functions define the vibration transmission characteristics and attenuation of vibration amplitude along the propagation path. The long-term dynamic stability of the track formation is studied using dynamic shear strain derived from the effective velocity. The peaks of observed contact forces and vibrations are statistically analyzed to assess the impact of train speed on the dynamic behavior of the infrastructure system. Next, a 3D numerical model expresses the maximum stress and displacements on the roadbed surface as a function of train speed. The model evaluates the earth pressures at rest and vehicle-induced additional earth pressures and horizontal wall movement. The investigation provides new insights into the behavior of railway track retaining walls under train loading, and the field data are freely available for other researchers to download. The findings could facilitate the design of more sustainable retaining walls in the future.

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Section: Vibration Accelerationmentioning

confidence: 99%

An Analysis of Dynamics of Retaining Wall Supported Embankments: Towards More Sustainable Railway Designs

Feng,

Luo,

Lyu

et al. 2023

Sustainability

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show abstract

“…Studies have indicated that the power of seismic waves strongly correlates with the level of structural damage induced 8,9 and the shutdown of high-tech equipment during high-precision processes. 10,11 Zengin and Abrahamson 8,9 defined ground motion power as a function of the structural fundamental period. By performing nonlinear inelastic dynamic time history analyses of three-and nine-story frames, they reported that the power of ground motions strongly correlates with structural maximum inter-story drift.…”

Section: Introductionmentioning

confidence: 99%

“…By performing nonlinear inelastic dynamic time history analyses of three-and nine-story frames, they reported that the power of ground motions strongly correlates with structural maximum inter-story drift. Chen 10 reported that the accumulative power spectral density of specific low-frequency ranges, which is conceptually similar to ground motion power, strongly correlates with scanner damage during high-tech fabrication process. They also reported that the seismic waves that damage these scanners do not pose a threat to structural systems or cause human discomfort, which indicates that the PGA and PGV of these waves are not excessively high.…”

Section: Introductionmentioning

confidence: 99%

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Novel prediction models of earthquake early warning for ground motion power in Taiwan

Chao,

Lin,

Chou

et al. 2023

Earthq Engng Struct Dyn

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Studies have indicated that the power of seismic waves, rather than the acceleration and velocity, strongly correlates with the level of structural damage and the shutdown of high‐tech equipment during high‐precision process. However, current earthquake early warning (EEW) systems in Taiwan issue a warning only for a seismic wave with high acceleration or velocity but not for that with high power. To extend the application of the EEW system to high‐tech fields, conventional and novel hybrid prediction models were developed in this study to predict the ground motion power and to issue EEWs for high‐power ground motions. A conventional prediction model that relies on earthquake source parameters was first developed to determine ground motion characteristics, and a hybrid prediction model that relies not only on earthquake source parameters but also on the on‐site ground motion parameter of P‐waves was developed to improve the prediction accuracy. The two‐step maximum likelihood method was used to derive model coefficients for considering the mixed effect of the ground motion records. The source, path, and site effects on the short‐period power and the long‐period power of ground motions were illustrated by the proposed models. A method for determining a broadcast scenario of EEW systems for high‐power ground motions with a target success rate and damage threshold was also developed. These novel prediction models can be used to develop a customized EEW system to provide an early warning for high‐power seismic waves in Taiwan.

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Monitoring of train-induced responses at asphalt support layer of a high-speed ballasted track

Luo

Liu

et al. 2021

Construction and Building Materials

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A review of spectral analysis for low-frequency transient vibrations

Cited by 9 publications

References 25 publications

An Analysis of Dynamics of Retaining Wall Supported Embankments: Towards More Sustainable Railway Designs

An Analysis of Dynamics of Retaining Wall Supported Embankments: Towards More Sustainable Railway Designs

Novel prediction models of earthquake early warning for ground motion power in Taiwan

Monitoring of train-induced responses at asphalt support layer of a high-speed ballasted track

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