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- Title
时速 350 km 高速铁路桥上全封闭声屏障车致振动分析.
- Authors
王少林; 周继超; 刘冀钊; 齐春雨
- Abstract
In order to analyze the vehicle-induced vibration of fully-enclosed sound barriers on 350 km / h high-speed railway bridges, the finite element model was established and the natural vibration characteristics of the structure were analyzed. Based on the dynamic theory of railway large-scale system, the dynamic interaction model of train-track-bridge-sound barriers was established, the dynamic response of the system when the train passed through the fully-enclosed sound barriers at high speed was numerically calculated and evaluated by using the simulation software RTTB. The results show that when CRH3 EMU passes through the bridge and the fully-enclosed sound barriers at a speed of 350 km / h, the safety index of the vehicle is qualified and the stability index is excellent. The design indexes of the bridge meet the requirements of the code. Compared with the case of single train passing through the bridge of CRH3 EMU, the maximum increase of vehicle dynamics index is within 6% in the double-row open mode of CRH3 EMU, and the vertical acceleration and vertical displacement at the top of the noise barriers increase by about one time. Under the influence of vehicle-induced vibration, the vibration deformation of the fully-enclosed sound barriers relative to the bridge is mainly transverse. The maximum transverse displacement of the top of the sound barrier is 11 times that of the bridge, and the maximum transverse acceleration of the top of the sound barrier is 6 times that of the bridge. The frequencies of the overall longitudinal and transverse inclinations of the sound barriers on continuous girder Bridges are 5. 356 Hz and 5. 392 Hz respectively, and the frequencies of the same vibration modes of the sound barriers on simply supported beams are close to them.
- Subjects
SPEED of sound; CONTINUOUS bridges; NOISE barriers; FINITE element method; FREQUENCIES of oscillating systems; BRIDGES; HIGH speed trains
- Publication
Railway Standard Design, 2023, Vol 67, Issue 11, p27
- ISSN
1004-2954
- Publication type
Article
- DOI
10.13238/j.issn.1004-2954.202204150001