- ISSN 0258-2724
- CN 51-1277/U
- EI Compendex
- Scopus
- Indexed by Core Journals of China, Chinese S&T Journal Citation Reports
- Chinese S&T Journal Citation Reports
- Chinese Science Citation Database
| Citation: | YU Ruodan, ZHAO Chunfa, FENG Yang, LI Kai, YANG Jing, HE Zhonglin. Dynamic Characteristics and Parameter Selection of Two-Span Continuous Beam Bridges Under Superconducting Electrodynamic Suspension Train Loads[J]. Journal of Southwest Jiaotong University. doi: 10.3969/j.issn.0258-2724.20250502
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To address the relatively limited research on the coupled dynamic interaction between superconducting electrodynamic suspension trains and continuous beam bridges, a coupled dynamic model of a superconducting electrodynamic suspension train and a two-span continuous beam bridge was established. The effects of bridge span and train marshalling on the dynamic response of the continuous beam were analyzed, and the parameters of the continuous beam bridge were selected based on the dynamic amplification factor. On this basis, the coupled vibration responses of the train-bridge system were calculated. The results indicate that the influence of train marshalling on the dynamic response of the bridge depends on the ratio of the bridge span to the vehicle spacing. When the ratio approaches 1.5, a significant vibration suppression effect of the bridge is observed. When the ratio is higher than 1.5, although primary resonance occurs, the superharmonic resonance response is small and insensitive to the number of train marshalling. When the ratio is lower than 1.5, the resonance energy accumulates significantly with the increase in train marshalling, resulting in poor train-bridge matching. Parametric analysis based on the limit of the dynamic amplification factor shows that the two-span continuous beam is slightly superior to a simply supported beam with the same span in terms of superharmonic resonance control. Within the speed range of 0–600 km/h, the continuous beam allows for a lower limit of the fundamental frequency, indicating that structural stiffness requirements can be reduced while satisfying dynamic safety, thereby improving economic efficiency. In the coupled train-bridge vibration analysis under the selected bridge parameters, the Sperling ride index of all vehicles consistently remains within the “excellent” limit. Notably, because the intermediate vehicles satisfy the vibration suppression matching conditions, the change in dynamic response at the resonance speed is minimal.
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