Random Vibration and Dynamic Reliability Analyses for Nonlinear MDOF Systems under Additive Excitations via DPIM

Yang, Dan; Chen, Hanshu; Meng, Zeng; Chen, Guohai

doi:10.1061/(asce)em.1943-7889.0002029

Cited by 5 publications

(1 citation statement)

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“…The running safety of the train track bridge coupling system were also investigated, but the initial unevenness of the track in this part is not random [18]. In practical situations, the initial unevenness of the track has random characteristics, and the randomness of the track will have random characteristics on the dynamic response of the vehicle body [19,20]. Therefore, it is necessary to considering the randomness of track irregularity, the vibration of the train track bridge system can more accurately and truly reflect the actual motion state of the train [5].…”

Section: Introductionmentioning

confidence: 99%

Dynamic Responses of Train-Symmetry-Bridge System Considering Concrete Creep and the Creep-Induced Track Irregularity

Li,

Ma,

Wei

et al. 2023

Symmetry

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This work considers the influence of concrete creep on track irregularities and establishes the dynamic motion equation of the train-track-bridge coupling system. The track irregularity is obtained by superposition of the initial geometric irregularity and additional geometric irregularity of the steel rail caused by creep. When high-speed railway trains pass through bridges; the vertical acceleration and vertical displacement of continuous beam bridges are related to the train’s operating speed, and the influence of creep camber is relatively small. At the same time, considering the randomness of track irregularities, the dynamic responses of the train track bridge coupling system under the action of random track irregularities are analyzed, and the dynamic responses of trains at different operating speeds are obtained. The deterministic and uncertain dynamic responses of the train track bridge system were compared and analyzed to verify the accuracy of the Karhunen Loéve expansion (KLE)-Point estimate method (PEM) calculation results. The results indicate that the random characteristics of track irregularities have a significant impact on train dynamic response. Based on the random system vibration analysis and considering the safety and comfort indicators of high-speed railway trains, the creep deformation limit of a continuous beam bridge with a length of 48 m + 80 m + 48 m is obtained to be 19 mm. This is the first time that the dynamic responses of train-symmetry-bridge system are calculated by considering concrete creep and the creep-induced track irregularity, which has certain significance for understanding the dynamics of train -bridge system. In addition, the proposed creep threshold is also of great significance to ensure the safety of traveling.

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