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Railway bridge dynamics considering piled foundations in soft soil

Journal Article (2024)
Authors

Borong Peng (Central South University China)

Lei Xu (Central South University China)

David P. Connolly (University of Leeds)

Zheng Li (Central South University China)

Xuhui He (Central South University China)

Yuanjie Xiao (Central South University China)

Y. Guo (TU Delft - Railway Engineering, University of Birmingham)

Affiliation
Geo-engineering
To reference this document use:
https://doi.org/10.1016/j.soildyn.2024.108844
More Info
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Publication Year
2024
Language
English
Affiliation
Geo-engineering
Volume number
184
DOI:
https://doi.org/10.1016/j.soildyn.2024.108844
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Abstract

The dynamic response of a railway bridge can be affected by the properties of its foundations, particularly if founded on soft soils. Thus, this work aims to establish a coupled dynamic model to investigate the vibration of train-track-bridge systems considering piled foundations embedded in soft soil. Firstly, to construct the simulation framework, the finite element and multi-body methods are used to model the dynamic behavior of a train-track-bridge interaction (TTBI) system and a pier-cap-pile-soil interaction system. The equilibrium of the two sub-systems is maintained through the bridge's bearing force and a multi-time-step integration strategy is introduced to improve computational efficiency. The proposed model is validated by comparing it to the results from commercial finite element software ABAQUS. Then results are computed using the proposed model and the conventional TTBI model without piles. It is concluded that when considering the piled foundations, the low-frequency vibration of the TTBI system is dominant. Moreover, the vibration energy in the track and bridge below 7 Hz is larger compared with the conventional TTBI model. The influence of train speed on the vibration characteristics of the pile and soil is analyzed. It is found that higher train speeds cause increased pile and soil accelerations at the frequencies associated with the train axle spacing. The novelty of the analysis is providing a new insight into the coupled vibration properties of TTBI systems considering the participation of piled foundations in soft soil.