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Structural Engineering and Mechanics Volume 76, Number 2, October25 2020 , pages 207-222 DOI: https://doi.org/10.12989/sem.2020.76.2.207 |
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Running safety of metro train over a high-pier bridge subjected to fluctuating crosswind in mountain city |
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Yunfei Zhang, Jun Li, Zhaowei Chen, Xiangyang Xu
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| Abstract | ||
| Due to the rugged terrain, metro lines in mountain city across numerous wide rivers and deep valleys, resulting in instability of high-pier bridge and insecurity of metro train subjected to fluctuating crosswind. To ensure the safe operation in metro lines in mountain cities, running safety of the metro train over the high-pier bridge under crosswind is analyzed in this paper. Firstly, the dynamic model of the wind-train-bridge (WTB) system is built, in which the speed-up effect of crosswind is fully considered. On the basis of time domain analysis, the basic characteristics of the WTB system with high-pier are analyzed. Afterwards, the dynamic responses varies with train speed and wind speed are calculated, and the safety zone of metro train over a high-pier bridge subjected to fluctuating crosswind in mountain city is determined. The results indicate that, fluctuating crosswind triggers drastic vibration to the metro train and high-pier bridges, which in turn causes running instability of the train. For this reason, the corresponding safety zone for metro train running on the high-pier is proposed, and the metro traffic on the high-pier bridge should be closed as the mean wind speed of standard height reaches 9 m/s (15.6 m/s for the train). | ||
| Key Words | ||
| running safety, fluctuating crosswind, high-pier bridge, mountain city, metro system, wind-train-bridge interaction | ||
| Address | ||
| Yunfei Zhang/Chongqing Jiaotong University Jun Li/Chongqing Jiaotong University Zhaowei Chen/Chongqing Jiaotong University Xiangyang Xu/Chongqing Jiaotong University | ||