Safety of Maglev Trains Moving on Bridges Subject to Foundation Settlements and Earthquakes
Publication: Journal of Bridge Engineering
Volume 19, Issue 1
Abstract
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 () 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 . For seismic loads, the maximum lateral ground acceleration can be extended to for the air gaps equal to 10 cm under . 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.
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Information & Authors
Information
Published In
Journal of Bridge Engineering
Volume 19 • Issue 1 • January 2014
Pages: 91 - 100
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Oct 3, 2012
Accepted: May 7, 2013
Published online: May 8, 2013
Published ahead of production: May 9, 2013
Published in print: Jan 1, 2014
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