Vibration reduction of high-speed railway bridges by adding size-adjusted vehicles

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For railway bridges subjected to high-speed trains, excessive vibration may occur due to a resonance phenomenon caused by periodic wheel-loads of the trains. In Korea, much attention has been paid to reduce the vibration level of railway bridges constructed for Korean high-speed trains (Korean Train eXpress: KTX). The railway bridges make up about 37% of the entire KTX railroads, and the severe vibration of the bridges could cause their maintenance and repair costs to be high. Much work has been done in the past few years to avoid excessive vibration. However, the majority of the work focuses on the alternation and modification of bridges. In this paper, a new vibration reduction scheme has been proposed by inserting size-adjusted vehicle(s) in the existing KTX train arrangement. The added vehicle(s) with adjusted size may produce out-of-phase loading and suppress the resonance phenomenon. Validation of the proposed scheme has been carried out by a series of numerical simulations and experiments using a 1/100 scaled train-bridge model. In the numerical simulations, vertical deflections, accelerations, and bending moments at the mid-span of the bridge model are computed with two parameters being varied: the size and the locations of the inserted vehicle unit(s). The experiments conducted with 1/2 sized vehicle(s), of which locations vary in the same manner as the numerical simulations, show that the general trends in the vibration reduction agree reasonably well with the numerical simulations and confirm the vibration reduction effects found in the numerical simulations. The numerical and experimental results demonstrate that the proposed scheme can effectively reduce vibrations of the high-speed railway bridges and subsequently reduce the repair and maintenance costs associated with the vibration induced damage. (C) 2010 Elsevier Ltd. All rights reserved.
Publisher
ELSEVIER SCI LTD
Issue Date
2010-09
Language
English
Article Type
Article
Citation

ENGINEERING STRUCTURES, v.32, pp.2839 - 2849

ISSN
0141-0296
DOI
10.1016/j.engstruct.2010.05.003
URI
http://hdl.handle.net/10203/98028
Appears in Collection
CE-Journal Papers(저널논문)
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