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Temperature Characteristics Analysis of the Ballastless Track under Continuous Hot Weather
| 题名： | Temperature Characteristics Analysis of the Ballastless Track under Continuous Hot Weather |
| 其他题名： | Ahmed,Z.,Marukic,I.,Zaghloul,S.,and Vitillo,N.(2005)."Validation of enhanced integrated climatic model predictions with New Jersey seasonal monitoring data."Transp.Res.Rec.,1913,148–161. |
| 正文语种： | 英文 |
| 作者： | Rongshan Yang |
| 关键词： | Ballastless track;Temperature distribution;Orientation;Bottom boundary condition;Long-time high temperature |
| 摘要： | In recent years, extreme weather has occurred frequently, which has exerted a harmful influence on ballastless track. This paper analyzes the heat transfer mechanism between ballastless track and the environment and presents bottom boundary conditions of the track temperature field based on theoretical derivation. A three-dimensional model is established for calculating the track temperature distribution while considering the geographical location and environmental conditions. A field test verifies this calculation model, and the temperature characteristics of the ballastless track under continuous hot weather are analyzed. The results indicate that the proposed method of determining the bottom boundary condition of ballastless track based on the climatic data is efficient and accurate. Under continuous hot weather, the long-term daily mean air temperature and stronger solar radiation cause continuous increase of the whole track temperature. As a consequence, the track temperature is 5–10°C above the air temperature, and there is a larger temperature gradient, which may induce curling deformation of the unitary ballastless track and buckling defects of the longitudinally-coupled slab. For maintenance of track structure, the proposed method is expected to predict the track defects caused by extreme weather based on the weather report. |
| 出版年： | 2017 |
| 论文唯一标识： | P-72Y2017V143N09007 |
| 英文栏目名称： | TECHNICAL PAPERS |
| doi： | 10.1061/JTEPBS.0000076 |
| 期刊名称： | Journal of Transportation Engineering |
| 拼音刊名(出版物代码)： | P-72 |
| 卷： | 143 |
| 期： | 09 |
| 页码： | 50-59 |
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