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Shock and Vibration
Volume 2014 (2014), Article ID 985602, 17 pages
http://dx.doi.org/10.1155/2014/985602
Research Article

The Seismic Response of High-Speed Railway Bridges Subjected to Near-Fault Forward Directivity Ground Motions Using a Vehicle-Track-Bridge Element

1College of Civil Science and Engineering, Yangzhou University, Yangzhou 225127, China
2National Engineering Laboratory for High-Speed Railway Construction, Central South University, Changsha 410075, China
3School of Civil Engineering, Central South University, Changsha 410075, China
4Department of Civil and Engineering, University of Auckland, Auckland 1142, New Zealand

Received 15 July 2013; Accepted 1 November 2013; Published 27 February 2014

Academic Editor: Vadim V. Silberschmidt

Copyright © 2014 Chen Ling-kun et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Based on the Next Generation Attenuation (NGA) project ground motion library, the finite element model of the high-speed railway vehicle-bridge system is established. The model was specifically developed for such system that is subjected to near-fault ground motions. In addition, it accounted for the influence of the rail irregularities. The vehicle-track-bridge (VTB) element is presented to simulate the interaction between train and bridge, in which a train can be modeled as a series of sprung masses concentrated at the axle positions. For the short period railway bridge, the results from the case study demonstrate that directivity pulse effect tends to increase the seismic responses of the bridge compared with far-fault ground motions or nonpulse-like motions and the directivity pulse effect and high values of the vertical acceleration component can notably influence the hysteretic behaviour of piers.