Analysis method of steel bridge surface relative humidity

WANG Zhuang; LIU Yong-jian; GONG Bo-xu; CHEN Sha; LIU Jiang; LIU Mao-yi; WANG Zhi-qiang

doi:10.19818/j.cnki.1671-1637.2025.01.017

Volume 25 Issue 1

Feb. 2025

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WANG Zhuang, LIU Yong-jian, GONG Bo-xu, CHEN Sha, LIU Jiang, LIU Mao-yi, WANG Zhi-qiang. Analysis method of steel bridge surface relative humidity[J]. Journal of Traffic and Transportation Engineering, 2025, 25(1): 234-247. doi: 10.19818/j.cnki.1671-1637.2025.01.017

Citation:

WANG Zhuang, LIU Yong-jian, GONG Bo-xu, CHEN Sha, LIU Jiang, LIU Mao-yi, WANG Zhi-qiang. Analysis method of steel bridge surface relative humidity[J]. Journal of Traffic and Transportation Engineering, 2025, 25(1): 234-247. doi: 10.19818/j.cnki.1671-1637.2025.01.017

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Analysis method of steel bridge surface relative humidity

doi: 10.19818/j.cnki.1671-1637.2025.01.017

1.
School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China
2.
School of Civil Engineering, Chongqing University, Chongqing 400045, China
3.
Chongqing City Construction Investment Corporation, Chongqing 400023, China

Funds:

National Natural Science Foundation of China 52478126

Scientific Research Program of Chongqing City Construction Investment Corporation CQCT-J5-SC-GC-222-008

More Information

Corresponding author: LIU Yong-jian(1966-), male, professor, PhD, lyj.chd@gmail.com
Received Date: 2024-06-27
Publish Date: 2025-02-25

Abstract

Abstract

To explore the temporal variation and distribution characteristics of surface relative humidity, the concept of the relative humidity boundary layer was introduced. The difference between surface relative humidity and environment relative humidity was clarified. Based on the physical relationship between air temperature and humidity, a method for calculating the surface relative humidity of steel bridges was proposed. The accuracy of the method was verified. The surface relative humidity of a steel arch bridge was calculated using this method. The difference between surface relative humidity and environmental relative humidity was quantified. The results show that the variation pattern of surface relative humidity in steel arch bridges is consistent with that of environment relative humidity. Both annual and daily variations exhibit distinct sinusoidal characteristics. The amplitude of surface relative humidity variation is larger. Surface relative humidity commonly exceeds environmental relative humidity. In high-humidity environments, this condition can persist for several days. The longitudinal distribution of surface relative humidity on the arch ribs is highly uneven. The maximum difference in surface relative humidity between the top plate at the arch crown and the arch foot is 16%. The maximum difference in surface relative humidity between the bottom plate at the arch crown and the arch foot is also 10%. The surface relative humidity in the middle of the tie beam is evenly distributed. Significant differences exist between the ends and the middle. The maximum difference exceeds 30%. During the testing period, the environmental wetting time is 1 191.5 hours. The surface wetting time is 2 016 hours, 1.71 times the environmental wetting time. The wetting time of the top plate of the arch rib is greater than that of the bottom plate. The maximum difference reaches 17.5%. The surface wetting time of the top plate of the tie beam is less than that of the bottom plate. The maximum difference reaches 25.5%. Both the difference coefficient in relative humidity and the difference coefficient in wetting time represent the differences between the surface environment of the steel bridge and the atmospheric environment. Two types of the distribution pattern of different coefficients are consistent. The difference coefficients near the arch crown are higher than that near the arch foot. The difference coefficients for the tie beams in the middle are higher than that at the ends. At the same cross-section, the difference coefficients for the top plates of the arch rib are higher than that for the bottom plates. The difference coefficients for the top plates of the tie beam are lower than that for the bottom plates.
- bridge engineering,
- surface relative humidity,
- theoretical analysis,
- temperature,
- atmospheric corrosion

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References

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Analysis method of steel bridge surface relative humidity

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