An efficient multi-time-step method for train-track-bridge interaction

Zhu, Zhihui; Gong, Weiping; Wang, Lidong; Li, Qi; Bai, Yu; Yu, Zhiwu; Harik, Issam E.

doi:10.1016/j.compstruc.2017.11.004

Cited by 59 publications

(27 citation statements)

References 37 publications

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“…The sleeper is assumed to be fully restrained. The matrix equation of the rail is identical with Equation (1) in form [31]. The corresponding damp matrix v C is identical with v K in terms of arrangement, except for different magnitudes.…”

Section: Modelling Of Trackmentioning

confidence: 99%

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Sudden Variation Effect of Aerodynamic Loads and Safety Analysis of Running Trains When Entering Tunnel Under Crosswind

et al. 2020

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Sudden variation of aerodynamic loads is a potential source of safety accidents of high-speed trains (HSTs). As a follow-up investigation on the aerodynamic response of a HST that enters a tunnel under crosswind environment, this paper focuses on the transient response of a HST’s safety indices based on the train–track coupling interaction model. Firstly, a wind–train–track coupling dynamic model is proposed by introducing transient aerodynamic loads into the vehicle–track system. Secondly, the temporal evolution of safety coefficients indicates that the train’s safety risk increases during tunnel entry with crosswind. Results show that the derailment coefficients and wheel load reduction rate during tunnel entry are not only larger than those in open air, but also those inside the tunnel are due to the sudden disappearance of wind excitation at the tunnel entrance. In addition, the characteristic wind curve, which is the wind velocity against the train speed, is presented for application based on the current specification of the safety criteria threshold. The investigation will be useful in assessing the safety risk of a running train subjected to other aerodynamic attacks, such as the coupling effect of an infrastructure scenario and crosswind in a windy area.

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Section: Modelling Of Trackmentioning

confidence: 99%

“…The sleeper is assumed to be fully restrained. The matrix equation of the rail is identical with Equation (1) in form [31]. Figure 4 shows the schematic diagram of track irregularity.…”

Section: Modelling Of Trackmentioning

confidence: 99%

Sudden Variation Effect of Aerodynamic Loads and Safety Analysis of Running Trains When Entering Tunnel Under Crosswind

et al. 2020

Self Cite

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“…A self-developed program called wind-train-rail structure (WTRSDYNA) is used to perform a case study [8,10,31]. The time-step size of the program solution is determined to be 2 × 10 −4 s. The dynamic responses (i.e.…”

Section: Solving Processmentioning

confidence: 99%

Sudden Variation Effect of Aerodynamic Loads and Safety Analysis of Running Trains when Entering Tunnel under Crosswind

Yang¹,

Deng²,

Zhu³

et al. 2020

Preprint

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Sudden variation of aerodynamic loads is the potential source of safety accidents of high-speed train (HST). As a follow-up investigation on the aerodynamic response of a HST that enters a tunnel under crosswind environment, this paper focuses on the transient response of a HST’s safety indices based on the train–track coupling interaction model. Firstly, a wind–train–track coupling dynamic model is proposed by introducing transient aerodynamic loads into the vehicle–track system. Secondly, the temporal evolution of safety coefficients indicates that the train’s safety risk increases during tunnel entry with crosswind. Results show that the derailment coefficients and wheel load reduction rate during tunnel entry are not only larger than those in open air but also those inside the tunnel due to the sudden disappearance of wind excitation at the tunnel entrance. In addition, the characteristic wind curve, which is the wind velocity against the train speed, is presented for application based on the current specification of the safety criteria threshold. The investigation will be useful in assessing the safety risk of a running train subjected to other aerodynamic attacks, such as the coupling effect of infrastructure scenario and crosswind in windy area.

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“…In the "fish-bone" model (Asgari et al 2013), the equivalent orthotropic shell element model has better structural details and was a better simulation for stiffness and mass distribution in the bridge deck sections. A two-layer track model, presented in Zhu et al (2018), was selected for modeling rails and sleepers. Of note, because these components have one dominant dimension, they were approximated by beam elements.…”

Section: Fe Modelingmentioning

confidence: 99%

Nonlinear dynamic analysis of long-span cable-stayed bridges with train–bridge and cable coupling

Zhu

Wang

Davidson

et al. 2019

Int J Adv Struct Eng

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Span lengths of newly constructed cable-stayed railway bridges continue to show increases relative to those of older bridges. Accompanying such increases is the importance of ensuring that vibrations of long-span cable-stayed bridges satisfy both safety and serviceability requirements, particularly for bridges that support train passages. In contrast to modern design of bridges that support roadway vehicles, current methods for analyzing cable-stayed railway bridges do not yet typically account for coupling effects that may occur between cables and the surrounding bridge structure during train passages. This paper presents a computational framework for the nonlinear dynamic analysis of railway bridges based on a coupled train-bridge analytical model and investigates the significance of accounting for cable-related coupling effects. A case study is then carried out, where coupled dynamic responses of cables, towers, and girders of an in-service railway bridge are computed and compared to those obtained using an uncoupled approach. These comparisons demonstrate the merits of accounting for coupling phenomena when computing dynamic characteristics of cable-stayed railway bridges and highlight benefits of the coupled analysis approach in bridge design applications.

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An efficient multi-time-step method for train-track-bridge interaction

Cited by 59 publications

References 37 publications

Sudden Variation Effect of Aerodynamic Loads and Safety Analysis of Running Trains When Entering Tunnel Under Crosswind

Sudden Variation Effect of Aerodynamic Loads and Safety Analysis of Running Trains When Entering Tunnel Under Crosswind

Sudden Variation Effect of Aerodynamic Loads and Safety Analysis of Running Trains when Entering Tunnel under Crosswind

Nonlinear dynamic analysis of long-span cable-stayed bridges with train–bridge and cable coupling

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