A substructure approach for analyzing pile foundation and soil vibrations due to train running over viaduct and its validation

Wu, Yongren; Bian, Xuecheng; Chen, Chong; Jiang, Jie

doi:10.1007/s40534-022-00276-z

Cited by 3 publications

References 21 publications

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Noise reduction mechanism of high-speed railway box-girder bridges installed with MTMDs on top plate

Zhang,

Yang

et al. 2024

Railw. Eng. Sci.

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The issue of low-frequency structural noise radiated from high-speed railway (HSR) box-girder bridges (BGBs) is a significant challenge worldwide. Although it is known that vibrations in BGBs caused by moving trains can be reduced by installing multiple tuned mass dampers (MTMDs) on the top plate, there is limited research on the noise reduction achieved by this method. This study aims to investigate the noise reduction mechanism of BGBs installed with MTMDs on the top plate. A sound radiation prediction model for the BGB installed with MTMDs is developed, based on the vehicle–track–bridge coupled dynamics and acoustics boundary element method. After being verified by field tested results, the prediction model is employed to study the reduction of vibration and noise of BGBs caused by the MTMDs. It is found that installing MTMDs on top plate can significantly affect the vibration distribution and sound radiation law of BGBs. However, its impact on the sound radiation caused by vibrations dominated by the global modes of BGBs is minimal. The noise reduction achieved by MTMDs is mainly through changing the acoustic radiation contributions of each plate of the bridge. In the lower frequency range, the noise reduction of BGB caused by MTMDs can be more effective if the installation of MTMDs can modify the vibration frequency and distribution of the BGB to avoid the influence of small vibrations and disperse the sound radiation from each plate.

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Noise reduction mechanism of high-speed railway box-girder bridges installed with MTMDs on top plate

Zhang,

Yang

et al. 2024

Railw. Eng. Sci.

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Impact of Train-Induced Vibrations on Residents’ Comfort and Structural Damages in Buildings

Seyedi

2024

J. Vib. Eng. Technol.

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The rapid growth of urbanization and the progress of industrialization have resulted in the construction of over or near-track buildings. Train-induced ground-borne vibrations have attracted attention because they can damage buildings and cause residents discomfort. This study conducted a series of finite element analyses on three 5-story concrete framed buildings, which were subjected to the passage of trains at various speeds. One of the buildings was modeled as an over-track building, whereas the other two buildings were located in close proximity to the track but at different distances. The present study investigated the impact of train speed and track-to-building distance on the acceleration and velocity responses of buildings. The comparison of residents’ comfort levels and the structural safety of buildings against potential damages was conducted using international standards as the controlling criteria. Furthermore, an efficient mitigation technique was implemented, involving the utilization of open trenches with different depths between buildings and the railway track. This approach was employed with the aim of minimizing the detrimental impacts caused by trains-induced vibrations. The findings indicated that the over-track building was impacted by the train-induced vibrations more than near-track buildings. Furthermore, it was shown that although the passage of high-speed trains can disturb the comfort of building residents and potentially cause some structural damage to buildings, it did not lead to any significant story drifts in the structures. Finally, the minimum required depth of open trenches to mitigate train-induced vibrations was computed for every type of buildings and train speeds.

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Structural Dynamic Response of Simply Supported Beam Bridge of High-Speed Railway Based on Time-Dependency Deterioration of Concrete

Jia,

Xie,

Zhou

et al. 2024

Preprint

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To investigate the dynamic characteristics of simply-supported beam bridges in high-speed railways under long-term deterioration, the deterioration law of concrete strength, considering the combined effects of carbonation and freeze-thaw cycles, is analyzed based on time-varying concrete strength theory. The accuracy of the finite element model is validated by measuring and comparing the vibration signals of a two-lane simply-supported beam bridge on the Beijing-Shenyang high-speed railway. Subsequently, the frequency variability of mid-span box girder vibration signals and vibration energy is analyzed using local maximum synchrosqueezing transform, and the multifractal characteristics of the box girder vibration signals are further examined. The results indicate that vertical acceleration of the box girder and the top of the pier increased by 31.2% and 67.6%, respectively, as deterioration intensified. Additionally, the vibration frequency of the box girder decreased from 28 Hz to 25 Hz, suggesting a marked decline in structural stiffness. Simultaneously, the energy of the self-oscillating frequency near 8 Hz dispersed progressively over time. The width (Δα) of the multifractal spectrum increases gradually, reflecting more pronounced multifractal characteristics, while the waveform of the box girder vibration signals shifts from small to large wave peaks. These findings provide valuable insights for performance evaluation, safety monitoring, and maintenance of simply-supported beam bridges.

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A substructure approach for analyzing pile foundation and soil vibrations due to train running over viaduct and its validation

Cited by 3 publications

References 21 publications

Noise reduction mechanism of high-speed railway box-girder bridges installed with MTMDs on top plate

Noise reduction mechanism of high-speed railway box-girder bridges installed with MTMDs on top plate

Impact of Train-Induced Vibrations on Residents’ Comfort and Structural Damages in Buildings

Structural Dynamic Response of Simply Supported Beam Bridge of High-Speed Railway Based on Time-Dependency Deterioration of Concrete

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