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Wind and Structures
  Volume 25, Number 1, July 2017 , pages 63-77
DOI: https://doi.org/10.12989/was.2017.25.1.063
 


Impacts of wind shielding effects of bridge tower on railway vehicle running performance
Mengxue Wu, Yongle Li and Wei Zhang

 
Abstract
    When railway vehicles run by towers of long span bridges, the railway vehicles might experience a sudden load-off and load-on phenomenon in crosswind conditions. To ensure the running safety of the railway vehicles and the running comfort of the passengers, some studies were carried out to investigate the impacts of sudden changes of aerodynamic loads on moving railway vehicles. In the present study, the aerodynamic coefficients which were measured in wind tunnel tests using a moving train model are converted into the aerodynamic coefficients in the actual scale. The three-component aerodynamic loads are calculated based on the aerodynamic coefficients with consideration of the vehicle movement. A three-dimensional railway vehicle model is set up using the multibody dynamic theory, and the aerodynamic loads are treated as the inputs of excitation varied with time for kinetic simulations of the railway vehicle. Thus the dynamic responses of the railway vehicle passing by the bridge tower can be obtained from the kinetic simulations in the time domain. The effects of the mean wind speeds and the rail track positions on the running performance of the railway vehicle are discussed. The three-component aerodynamic loads on the railway vehicle are found to experience significant sudden changes when the vehicle passes by the bridge tower. Correspondingly, such sudden changes of aerodynamic loads have a large impact on the dynamic performance of the running railway vehicle. The dynamic responses of the railway vehicle have great fluctuations and significant sudden changes, which is adverse to the running safety and comfort of the railway vehicle passing by the bridge tower in crosswind conditions.
 
Key Words
    wind shielding effects of bridge tower; sudden changes of aerodynamic loads; crosswind condition; railway vehicle; running performance; multibody dynamic theory
 
Address
Mengxue Wu: School of Civil Engineering and Architecture, Southwest Petroleum University, Chengdu, Sichuan 610500, P.R. China
Yongle Li: Department of Bridge Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, P.R. China
Wei Zhang: Department of Civil and Environmental Engineering, University of Connecticut, Storrs, CT 06269-3037, USA


 

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