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- Title
高速铁路跨度 250 m 级连续刚构桥长波不平顺控制研究.
- Authors
游颖川; 谢海清; 卢 斌; 张 迅
- Abstract
As the span of continuous rigid frame bridge increases, the deformation of bridge deck caused by shrinkage, creep and temperature increases, resulting in the aggravation of the track long wave irregularity, which may have an adverse impact on the trains running. Taking a trial designed high speed railway continuous rigid frame bridge with main span of 250 m as the research object, the finite element model is established. The strength and stiffness of the bridge are checked according to the specifications, and the corresponding deck additional deformation caused by shrinkage, creep and temperature is calculated. The vehicle-train-bridge dynamic simulation software is used to analyze the influence of the resulting long-wave irregularity on the train dynamic response. The midpoint chord measurement method is selected as the evaluation index, and the optimal chord measurement length is selected through correlation analysis. Finally, the deck deformation and the equivalent irregularity limited values of the continuous rigid frame under the optimal chord length are calculated. The results show that the additional deformation of the transverse and vertical bridge deck occurs in the midspan section of the bridge. When the additional deformation of the bridge deck increases to 1. 9 times and the train passes through the continuous rigid frame at a speed of 350 km / h, the vertical acceleration of the train first reaches the limit value of 1.3 m / s². The midpoint chord method with a 60 m chord length matches well with the train response, and is suitable for evaluating the long-wave irregularity of continuous rigid frame. The measured values of the midpoint chord method with a 60 m chord length of the deck additional deformation and the equivalent irregularity of the continuous rigid frame are 7. 2 mm and 14. 5 mm respectively, and the corresponding limit values are recommended to be 7 mm and 14 mm.
- Publication
Railway Standard Design, 2024, Vol 68, Issue 4, p102
- ISSN
1004-2954
- Publication type
Article
- DOI
10.13238/j.issn.1004-2954.202210020002