Ground Motion Induced by Train Passage
Publication: Journal of Engineering Mechanics
Volume 132, Issue 2
Abstract
Two methods are illustrated to effectively calculate the ground motion induced by constant speed moving loads. On the one hand, the dynamic Betti–Rayleigh reciprocity theorem allows one to take full advantage of the availability of Green’s functions for a homogeneous or a horizontally layered half-space. On the other hand, the spectral element method allows one to deal with complicated configurations, including dynamic soil-structure interaction, with an accuracy that is significantly higher than classical finite element or finite difference methods. Both the Betti–Rayleigh and spectral element methods are considered in three dimensions. After validating both methods, the decay of peak ground motion with distance is analyzed as a function of load speed and frequency. For speeds lower than the Rayleigh wave velocity in the soil, the decay turns out to be much faster than for a stationary point load. This effect is studied in detail by an analytical approach and interpreted in terms of destructive interference. Finally, the previous analytical and numerical results are checked against the records obtained at Ath, Belgium, during a field experiment to study ground motion induced by high-speed trains in soft soil conditions.
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Acknowledgments
The help of Professor Eduardo Kausel in providing the program PUNCH and suggestions for its use, and of Professor Geert Degrande for making the Thalys data available on the web,is gratefully acknowledged. The first writer (R. P.) acknowledges funding from the National Ministry of Education, University, and Research (MIUR Cofinanziamento 2003, Prot n. 2003080575-002).
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Information & Authors
Information
Published In
Journal of Engineering Mechanics
Volume 132 • Issue 2 • February 2006
Pages: 201 - 210
Copyright
© ASCE.
History
Received: Jun 7, 2004
Accepted: May 19, 2005
Published online: Feb 1, 2006
Published in print: Feb 2006
Notes
Note. Associate Editor: Nicos Makris
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