Wind and Structures

Techno-Press (테크노프레스)
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Dynamic analysis of wind-vehicle-bridge system considering additional moments of non-uniform winds by wind shielding effect of multi-limb tower

  • Xu Han (Department of Bridge Engineering, Southwest Jiaotong University) ;
  • Huoyue Xiang (Department of Bridge Engineering, Southwest Jiaotong University) ;
  • Xuli Chen (Department of Bridge Engineering, Southwest Jiaotong University) ;
  • Yongle Li (Department of Bridge Engineering, Southwest Jiaotong University)
  • Received : 2021.07.20
  • Accepted : 2022.12.22
  • Published : 2023.01.26
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Abstract

To evaluate the wind shielding effect of bridge towers with multiple limbs on high-speed trains, a wind tunnel test was conducted to investigate the aerodynamic characteristics of vehicles traversing multi-limb towers, which represented a combination of the steady aerodynamic coefficient of the vehicle-bridge system and wind environment around the tower. Subsequently, the analysis model of wind-vehicle-bridge (WVB) system considering the additional moments caused by lift and drag forces under nonuniform wind was proposed, and the reliability and accuracy of the proposed model of WVB system were verified using another model. Finally, the factors influencing the wind shielding effect of multi-limb towers were analyzed. The results indicate that the wind speed distributions along the span exhibit two sudden changes, and the wind speed generally decreases with increasing wind direction angle. The pitching and yawing accelerations of vehicles under nonuniform wind loads significantly increase due to the additional pitching and yawing moments. The sudden change values of the lateral and yawing accelerations caused by the wind shielding effect of multi-limb tower are 0.43 m/s2 and 0.11 rad/s2 within 0.4 s, respectively. The results indicate that the wind shielding effect of a multi-limb tower is the controlling factor in WVB systems.

Keywords

Acknowledgement

This work was supported by the financial support from the National Natural Science Foundation of China (51978589, 51778544), and the Fundamental Research Funds for the Central Universities (2682021CG014).

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