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- Title
基于车桥耦合振动的双层六线铁路 桥梁疲劳性能评估.
- Authors
崔圣爱; 张猛; 曾光; 申路; 苏姣; 祝兵
- Abstract
To explore the spatial effects of coupling vibration of double-deck six-line railway train-bridge systems, the simulation calculation of a train-bridge system was carried out by numerical methods. The spatial influence law and the most unfavorable rod position of the whole bridge were determined and applied to fatigue damage assessment. The simulation model of the train-bridge system was established based on the actual train frequency, and the time history of the bridge variable amplitude stress was obtained. The fatigue damage analysis was conducted based on the Miner linear damage accumulation theory and the stress-number curve. The results show that the dynamic responses of the vehicle and the bridge under spatial driving conditions meet the specification requirements. Compared with plane driving conditions, the dynamic responses of the vehicle increase in space driving conditions, and the increment of the high-speed electric multiple units(EMU)is more obvious than that of the freight train. The space-eccentric load coefficient of the EMU safety index is 3.808. The influence of space traffic on the transverse displacement of the bridge is significant, and the influence coefficient is 1.546. The fatigue damage indexes of the key rods of the bridge increase in different degrees when driving in space, and the maximum value is 48.21%. During the service period of the bridge, the fatigue damage degree of the main truss's most unfavorable link connection details is 0.509.
- Publication
Journal of Southeast University / Dongnan Daxue Xuebao, 2023, Vol 53, Issue 1, p67
- ISSN
1001-0505
- Publication type
Article
- DOI
10.3969/j.issn.1001-0505.2023.01.009