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- Title
异步性温度变化下斜拉桥上 列车走行性研究.
- Authors
戴公连; 肖尧; 王芬; 葛浩; 饶惠明
- Abstract
The structure of cable-stayed bridge is complex, and the temperature change law of each component under the action of ambient temperature shows the characteristic of asynchrony, but this characteristic has not been considered in the current study of temperature field and high speed train runnability of cable-stayed bridge. To study the influence of this feature, taking the main bridge of Quanzhou Bay sea crossing bridge on the newlybuilt Fuzhou Xiamen passenger dedicated line as an example, the annual and daily variation rules and asynchrony were analyzed based on the 1-year measured temperature data of the main beam, bridge tower, and cable, and then the influence of asynchrony temperature change on the temperature deformation of the main beam and train runnability was studied based on the finite element (FE) model. The research conclusions are as follows: the uniform temperature component of main beam, bridge tower and cable, and linear temperature difference component of main beam change according to the cosine curve in the annual cycle. The annual fluctuation amplitude of the longitudinal and transverse linear temperature difference of the bridge tower is so small that their influence on the temperature deformation of the main beam can be ignored. The time history function of the uniform temperature component of main beam, bridge tower and cable, and linear temperature difference component of main beam can be expressed by cosine formula and linear formula respectively when their daily temperature is normal fluctuation and continuous cooling. The amplitude and regularity of annual and daily changes of different temperature components are not consistent, and they cannot be synchronized to the daily maximum for most time of the year. When considering the influence of asynchronous temperature variation, the deformation of girder and the dynamic response of train under the most unfavorable temperature condition are both greater than these under the condition of the maximum superposition of each temperature component and the overall temperature rise and decrease of bridge structure. The results show that the asynchronous temperature variation has an important influence on the temperature deformation of cable-stayed bridge and the train runnability, which should be considered in the analysis.
- Subjects
XIAMEN Shi (China); QUANZHOU Shi (China); FUZHOU Fu (Fujian Sheng, China); HIGH speed trains; CABLE-stayed bridges; DEBYE temperatures; HIGH temperatures; CONTINUOUS bridges; COMPOSITE construction; DEFORMATIONS (Mechanics)
- Publication
Journal of Railway Science & Engineering, 2023, Vol 20, Issue 10, p3820
- ISSN
1672-7029
- Publication type
Article
- DOI
10.19713/j.cnki.43-1423/u.T20221892