Simplified Calculation of Temperature in Concrete Slabs of Ballastless Track and Influence of Extreme Weather

LIU Xueyi; LI Jiali; KANG Weixin; LIU Xiaokai; YANG Rongshan

doi:10.3969/j.issn.0258-2724.2017.06.001

Volume 30 Issue 6

Dec. 2017

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Journal of Southwest Jiaotong University > 2017 > 30(6): 1037-1045,1060.

LIU Xueyi, LI Jiali, KANG Weixin, LIU Xiaokai, YANG Rongshan. Simplified Calculation of Temperature in Concrete Slabs of Ballastless Track and Influence of Extreme Weather[J]. Journal of Southwest Jiaotong University, 2017, 30(6): 1037-1045,1060. doi: 10.3969/j.issn.0258-2724.2017.06.001

Citation:

LIU Xueyi, LI Jiali, KANG Weixin, LIU Xiaokai, YANG Rongshan. Simplified Calculation of Temperature in Concrete Slabs of Ballastless Track and Influence of Extreme Weather[J]. Journal of Southwest Jiaotong University, 2017, 30(6): 1037-1045,1060. doi: 10.3969/j.issn.0258-2724.2017.06.001

Citation:

LIU Xueyi, LI Jiali, KANG Weixin, LIU Xiaokai, YANG Rongshan. Simplified Calculation of Temperature in Concrete Slabs of Ballastless Track and Influence of Extreme Weather[J]. Journal of Southwest Jiaotong University, 2017, 30(6): 1037-1045,1060. doi: 10.3969/j.issn.0258-2724.2017.06.001

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Simplified Calculation of Temperature in Concrete Slabs of Ballastless Track and Influence of Extreme Weather

doi: 10.3969/j.issn.0258-2724.2017.06.001

Received Date: 28 Dec 2016
Publish Date: 25 Dec 2017

Abstract

Abstract

In order to ascertain the temperature distribution characteristics of a ballastless track, heat transfer mechanisms between the concrete slab and the environment were investigated, and a field temperature test of the ballastless track was conducted. The spectrum analysis method was used to study the relationship between meteorological data and the measured concrete slab temperature. Further, based on thermodynamic principles and experimentation, concrete slab thermal parameters were calculated, and a simplified concrete slab temperature calculation method was established. The predicted and measured results were then compared, the influence of solar radiation, wind, and air temperature on track temperature were studied, and concrete slab temperature distribution characteristics under extreme weather were also analysed. The results show that this calculation method has good accuracy (0.4-3.0℃) and applicability in calculating concrete slab temperature. The concrete slab thermal diffusivity was determined to be 0.004 3 m2/h. Mean air temperature and solar radiation play a leading role in overall concrete slab temperature, and the air temperature amplitude greatly influences the concrete slab temperature gradient. When the wind scale is greater than 4, the concrete slab surface temperature is approximate to the equivalent air temperature. During extreme weather, the temperature at the lower concrete slab surface can reach 50℃, and the temperature gradient can reach 110℃/m.
- ballastless track,
- temperature,
- spectrum analysis,
- inversion analysis,
- extreme weather

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References(6)

References

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Simplified Calculation of Temperature in Concrete Slabs of Ballastless Track and Influence of Extreme Weather

doi: 10.3969/j.issn.0258-2724.2017.06.001