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Wind and Structures Volume 36, Number 1, January 2023 , pages 1-14 DOI: https://doi.org/10.12989/was.2023.36.1.001 |
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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 |
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Xu Han, Huoyue Xiang, Xuli Chen and Yongle Li
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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. | ||
| Key Words | ||
| multi-limb tower; nonuniform wind; running safety; wind-vehicle-bridge (WVB) system; wind shielding effect; wind tunnel test | ||
| Address | ||
| Xu Han:1)Department of Bridge Engineering, Southwest Jiaotong University, Chengdu 610031, Sichuan, China 2)Chengdu Engineering Limited Liability Company of China Railway No. 5 Engineering Group Co., Ltd., Chengdu 610031, Sichuan, China Huoyue Xiang and Yongle Li:1)1Department of Bridge Engineering, Southwest Jiaotong University, Chengdu 610031, Sichuan, China 2)3Wind Engineering Key Laboratory of Sichuan Province, Chengdu 610031, Sichuan, China Xuli Chen:Department of Bridge Engineering, Southwest Jiaotong University, Chengdu 610031, Sichuan, China | ||