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Critical speed and resonance criteria of railway bridge response to moving trains
journal contribution
posted on 2017-05-19, 15:31 authored by Lei Mao, Yong LuThe dynamic response of railway bridges to moving trains is complicated because of the involvement of the moving loads and the
moving masses. Among various response characteristics, bridge resonance is of particular interest in terms of the structural effect and safety of
the bridge. As far as the global bridge response is concerned, it is generally understood that when one of the apparent trainload excitation
frequencies coincides with the fundamental natural frequency of the bridge, resonance could occur. However, such a general criterion is of
little practical use because a typical trainload would involve numerous apparent frequencies (at equal intervals); consequently, for a given
bridge (natural frequency), there could be many train speeds that satisfy the preceding resonance condition. Therefore, it is necessary to establish
the relative severity of the resonance associated with each resonance scenario. This paper presents the development of a new resonance
severity indicator, called Z factor, for the assessment of the resonance effect. It is found that the resonance severity is essentially governed
by the ratio between the bridge and carriage lengths. When the carriage mass is significant, the same Z factor will apply; however, the underlying
resonance speeds will change because of the altered natural frequency of the bridge-train system. Numerical results demonstrate that the
proposed methods are effective for the determination of the resonance effects associated with the potential resonance speeds.
History
School
- Mechanical, Electrical and Manufacturing Engineering
Published in
Journal of Bridge EngineeringVolume
18Issue
2Pages
131 - 141Citation
MAO, L. and LU, Y., 2011. Critical speed and resonance criteria of railway bridge response to moving trains. Journal of Bridge Engineering, 18 (2), pp.131-141Publisher
© American Society of Civil EngineersVersion
- NA (Not Applicable or Unknown)
Publisher statement
This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/Acceptance date
2011-11-03Publication date
2011Notes
This paper is closed access.Publisher version
Language
- en