Earthquakes and Structures

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Dynamic response of integrated vehicle-bridge-foundation system under train loads and oblique incident seismic P waves

  • Xinjun Gao (School of Civil Engineering, Zhengzhou University) ;
  • Huijie Wang (School of Civil Engineering, Zhengzhou University) ;
  • Fei Feng (Zhengzhou urban and rural construction bureau) ;
  • Jianbo Wang (School of Civil Engineering and Architecture, Zhengzhou University of Aeronautics)
  • Received : 2022.12.05
  • Accepted : 2024.01.10
  • Published : 2024.02.25
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Abstract

Aiming at the current research on the dynamic response analysis of the vehicle-bridge system under earthquake, which fails to comprehensively consider the impact of seismic wave incidence angles, terrain effects and soil-structure dynamic interaction on the bridge structure, this paper proposes a multi-point excitation input method that can consider the oblique incidence seismic P Waves based on the viscous-spring artificial boundary theory, and verifies the accuracy and feasibility of the input method. An overall numerical model of vehicle-bridge-soil foundation system in valley terrain during oblique incidence of seismic P-wave is established, and the effects of seismic wave incidence characteristics, terrain effects, soil-structure dynamic interactions, and vehicle speeds on the dynamic response of the bridge are analyzed. The research results indicate that with an increase in P wave incident angle, the vertical dynamic response of the bridge structure decreased while the horizontal dynamic response increased significantly. Traditional design methods which neglect multi-point excitation would lead to an unsafe structure. The dynamic response of the bridge structure significantly increases at the ridge while weakening at the valley. The dynamic response of bridge structures under earthquake action does not always increase with increasing train speed, but reaches a maximum value at a certain speed. Ignoring soil-structure dynamic interaction would reduce the vertical dynamic response of the bridge piers. The research results can provide a theoretical basis for the seismic design of vehicle-bridge systems in complex mountainous terrain under earthquake excitation.

Keywords

Acknowledgement

The research reported in this paper was supported by the National Natural Science Foundation of China (NSFC) through Grant No. 52078469 and Key Scientific and Technological Project of Henan Province (182102310009). These supports are greatly appreciated.

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