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Dynamic Stress of Subgrade Bed Layers Subjected to Train Vehicles with Large Axle Loads
Joint Authors
Xu, Fang
Leng, Wuming
Nie, Rusong
Yang, Qi
Mei, Huihao
Liu, Wenjie
Source
Issue
Vol. 2018, Issue 2018 (31 Dec. 2018), pp.1-12, 12 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2018-12-23
Country of Publication
Egypt
No. of Pages
12
Main Subjects
Abstract EN
The dynamic responses of subgrade bed layers are the key factors affecting the service performance of a heavy-haul railway.
A 3D train-track-subgrade interaction finite element (FE) model was constructed using the ABAQUS code, where different vertical irregular track spectra were simulated by modifying the vertical node coordinates of the FE mesh of the rail.
Then, the dynamic stresses in the subgrade bed layers subjected to heavy-haul trains were studied in detail.
The results showed the following: (1) the transverse distribution of the dynamic stress transformed from a bimodal pattern to a unimodal pattern with increasing depth; (2) the pass of adjacent bogies of adjacent carriages can be simplified once loaded on the subgrade since the dynamic stresses are maintained around the peak value during the pass of the adjacent bogies; (3) the dynamic stress at the bottom of the subgrade bed surface layer was more sensitive to the train axle load compared with that at the subgrade surface because the dynamic stresses induced by the two rails were gradually overlaid with increasing depth; (4) the maximum dynamic stress at the subgrade bed bottom was reduced by approximately 70% compared with that at the subgrade surface; (5) the vertical track irregularities intensified the vertical excitation between the train vehicle wheels and rails, and the maximum dynamic stress at the subgrade surface under the action of the irregular heavy-haul track spectrum increased by 23% compared with the smooth rail condition; and (6) the possible maximum dynamic stress (σdm) at the subgrade surface under the action of irregular track spectra can be predicted using the triple standard deviation principle of a normally distributed random variable, i.e., σdm = μ + 3σ (where μ and σ are the expectation and standard deviation of σdm, respectively).
American Psychological Association (APA)
Xu, Fang& Yang, Qi& Liu, Wenjie& Leng, Wuming& Nie, Rusong& Mei, Huihao. 2018. Dynamic Stress of Subgrade Bed Layers Subjected to Train Vehicles with Large Axle Loads. Shock and Vibration،Vol. 2018, no. 2018, pp.1-12.
https://search.emarefa.net/detail/BIM-1215148
Modern Language Association (MLA)
Xu, Fang…[et al.]. Dynamic Stress of Subgrade Bed Layers Subjected to Train Vehicles with Large Axle Loads. Shock and Vibration No. 2018 (2018), pp.1-12.
https://search.emarefa.net/detail/BIM-1215148
American Medical Association (AMA)
Xu, Fang& Yang, Qi& Liu, Wenjie& Leng, Wuming& Nie, Rusong& Mei, Huihao. Dynamic Stress of Subgrade Bed Layers Subjected to Train Vehicles with Large Axle Loads. Shock and Vibration. 2018. Vol. 2018, no. 2018, pp.1-12.
https://search.emarefa.net/detail/BIM-1215148
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1215148