Running safety analysis of a train on the Tsing Ma Bridge under turbulent winds |
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| Authors: | Weiwei Guo He Xia Youlin Xu |
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| Institution: | 1. School of Civil Engineering, Beijing Jiaotong Univ, Beijing 100044, China
2. Dept. of Civil and Structural Engineering, The Hong Kong Polytechnic Univ., Kowloon, Hong Kong, China |
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| Abstract: | The dynamic responses of the Tsing Ma suspension bridge and the running behaviors of trains on the bridge under turbulent
wind actions are analyzed by a three-dimensional wind-train-bridge interaction model. This model consists of a spatial finite
element bridge model, a train model composed of eight 4-axle identical coaches of 27 degrees-of-freedom, and a turbulent wind
model. The fluctuating wind forces, including the buffeting forces and the self-excited forces, act on the bridge only, since
the train runs inside the bridge deck. The dynamic responses of the bridge are calculated and some results are compared with
data measured from Typhoon York. The runnability of the train passing through the Tsing Ma suspension bridge at different
speeds is researched under turbulent winds with different wind velocities. Then, the threshold curve of wind velocity for
ensuring the running safety of the train in the bridge deck is proposed, from which the allowable train speed at different
wind velocities can be determined. The numerical results show that rail traffic on the Tsing Ma suspension bridge should be
closed as the mean wind velocity reaches 30 m/s. |
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| Keywords: | Tsing Ma Bridge turbulent wind dynamic interaction running safety threshold wind velocity |
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