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首页> 外文期刊>Journal of bridge engineering >Safety of Maglev Trains Moving on Bridges Subject to Foundation Settlements and Earthquakes
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Safety of Maglev Trains Moving on Bridges Subject to Foundation Settlements and Earthquakes

机译：受基础沉降和地震影响的桥上磁悬浮列车的安全性

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This paper investigates the safety of a series of maglev trains moving on multispan bridges undergoing foundation settlements and earthquakes. Rail irregularities, the proportional-integral (PI) controller with constant tuning gains, and maglev train-guideway-bridge interactions are considered in the three-dimensional (3D) nonlinear finite-element analysis. The numerical results indicate that the air gaps are slightly dependent on the train speed for the foundation settlements, but are almost independent of it for the seismic loads. When the initial ratio of lateral-to-vertical electromagnetic forces (G_y/G_z) is enlarged, the maglev train can sustain a larger earthquake. For the train with 1 -cm air gaps and uniform maglev forces, the finite-element results indicate that the difference in the critical vertical foundation settlement between two piers can be extended to 3 cm, and the critical bridge lateral deflection can be extended to 2.2 cm under G_y/G_z = 1. For seismic loads, the maximum lateral ground acceleration can be extended to 410 cm/s~2 for the air gaps equal to 10 cm under G_y/G_z = 0.5. These conditions indicate that the electromagnetic suspension (EMS) system can overcome the problem of foundation settlement, and the electrodynamic suspension (EDS) system can overcome both foundation settlement and earthquake problems.
机译：本文研究了一系列在发生地基沉降和地震的多跨桥梁上行驶的磁悬浮列车的安全性。在三维（3D）非线性有限元分析中考虑了轨道不规则性，具有恒定调整增益的比例积分（PI）控制器以及磁悬浮列车-导轨桥之间的相互作用。数值结果表明，气隙在一定程度上与地基沉降的列车速度有关，但对于地震荷载几乎与火车速度无关。当横向与纵向电磁力的初始比率（G_y / G_z）增大时，磁悬浮列车可以承受更大的地震。对于气隙为1 cm且磁悬浮力均匀的列车，有限元结果表明，两个桥墩之间的临界竖向基础沉降差异可扩展至3 cm，而关键桥梁的侧向挠度则可扩展至2.2。在G_y / G_z = 1的情况下，cm为1。对于地震载荷，在G_y / G_z = 0.5的情况下，等于10 cm的气隙，最大横向地面加速度可以扩展到410 cm / s〜2。这些条件表明，电磁悬挂（EMS）系统可以克服地基沉降问题，而电动悬挂（EDS）系统可以克服地基沉降和地震问题。

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