Influence of Random Multi-Point Seismic Excitations on the Safety Performance of a Train Running on a Long-Span Bridge

Wang, Wei, Zhang, Yahui and Ouyang, Huajiang ORCID: 0000-0003-0312-0326 (2020) Influence of Random Multi-Point Seismic Excitations on the Safety Performance of a Train Running on a Long-Span Bridge. International Journal of Structural Stability and Dynamics, 20 (4). p. 2050054.

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Official URL: http://dx.doi.org/10.1142/s0219455420500546

Abstract

<jats:p> The increasing use of bridges in high-speed railway (HSR) lines raises the possibility of train derailment on bridges under seismic excitations. In this paper, the influence of random multi-point earthquakes on the safe running of a train on a long-span bridge is studied in terms of the dynamic reliability, considering spatial seismic effects, and randomness of ground motions and train locations. The equations of motion for the train and the track/bridge as time-invariant subsystems under earthquakes are established, separately. The two subsystems are connected via the wheel–rail interface, for which a nonlinear contact model and detachment are considered. The time-history samples of nonstationary multi-point random earthquakes considering wave passage effects and incoherence effects are generated by the autoregressive moving average (ARMA) model. The ground motions are imposed on the bridge support points in terms of displacement and velocity. The train location at the time of earthquake is considered a uniformly distributed random variable. The running safety reliability of a train moving on a long-span bridge under earthquakes is determined by combining subset simulation (SS) with a prediction-based iterative solution method. Under different seismic components, train speeds, apparent seismic wave velocities and seismic intensities, the most unfavorable train location intervals are determined, which provides a reference for the safety performance assessment of trains traveling on bridges under earthquakes. Numerical results show that the influence of the lateral seismic component on the wheel derailment coefficient (WDC) is greater than the vertical seismic component, and the earthquake that occurs before the train’s arrival at 70% length of the bridge will significantly reduce its running safety. </jats:p>

Item Type:	Article
Uncontrolled Keywords:	Train-track-bridge system, wheel-rail contact, subset simulation, earthquake, dynamic reliability
Depositing User:	Symplectic Admin
Date Deposited:	19 May 2020 09:09
Last Modified:	18 Jan 2023 23:51
DOI:	10.1142/s0219455420500546
Related URLs:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3088001