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Volume 56 Issue 2
Apr.  2021
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Journal of Southwest Jiaotong University  > 2021  >  56(2): 229-237.
LEI Hujun, HUANG Jiangze. Seismic Responses Analysis of Train-Track-Bridge System Considering Pile-Soil Interaction[J]. Journal of Southwest Jiaotong University, 2021, 56(2): 229-237. doi: 10.3969/j.issn.0258-2724.20190694
Citation: LEI Hujun, HUANG Jiangze. Seismic Responses Analysis of Train-Track-Bridge System Considering Pile-Soil Interaction[J]. Journal of Southwest Jiaotong University, 2021, 56(2): 229-237. doi: 10.3969/j.issn.0258-2724.20190694
shu

Seismic Responses Analysis of Train-Track-Bridge System Considering Pile-Soil Interaction

doi: 10.3969/j.issn.0258-2724.20190694
  • Received Date: 17 Jul 2019
  • Rev Recd Date: 27 Sep 2019
    • Available Online: 11 Dec 2019
  • Publish Date: 15 Apr 2021
    Abstract
  • Understanding the influence of pile-soil interaction on seismic responses of a train-bridge system is necessary for studying the safety of trains running over high-speed railway bridges under earthquake. Based on the train-track-bridge coupled vibration theory, the Winkler foundation beam is used to simulate the pile group foundation and spring parameters are calculated by m method. A complete train-track-bridge-pile group coupled vibration model with seismic excitations is established, and a simulation analysis program is developed. Taking a (88 + 168 + 88) m prestressed concrete continuous rigid frame bridge as an example, a pile group foundation model considering pile-soil interaction, a rigid foundation model and an elastic foundation model are established respectively, and the last two models are used for comparison with the first one. By inputting three typical seismic waves, the coupled vibration responses of the three models are calculated and compared, and the pile-soil interaction is studied. The results show that the influence of pile-soil interaction on the lateral dynamic responses of the bridge, track and train subsystems under earthquake is greater than that on the vertical one, and the influence on the dynamic responses of the bridge and track subsystems is greater than that of the train subsystem. For the calculation conditions of this paper, the dynamic responses of bridge, track and train subsystems will be smaller if pile-soil interaction is not considered; specifically, the derailment coefficient, wheel load reduction rate and wheel-axle lateral force of the train are 5.8%, 8.6% and 9.0% smaller, respectively. Besides, the influence of pile-soil interaction on the safety index of the train will not change with the train speed. The obtained results can provide reference for the seismic design of high-speed railway bridges in earthquake areas.

     

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