Volume 25 Issue 2
Apr.  2025
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MENG Qing-ling, DUAN Hao-chen, WANG Bao-lin, GUO Xiao-yu, WANG Hai-liang, ZHANG He. Moisture diffusion law of cracked HDPE sheath for bridge cables under alternating action of ultraviolet and fatigue loads[J]. Journal of Traffic and Transportation Engineering, 2025, 25(2): 235-251. doi: 10.19818/j.cnki.1671-1637.2025.02.015
Citation: MENG Qing-ling, DUAN Hao-chen, WANG Bao-lin, GUO Xiao-yu, WANG Hai-liang, ZHANG He. Moisture diffusion law of cracked HDPE sheath for bridge cables under alternating action of ultraviolet and fatigue loads[J]. Journal of Traffic and Transportation Engineering, 2025, 25(2): 235-251. doi: 10.19818/j.cnki.1671-1637.2025.02.015

Moisture diffusion law of cracked HDPE sheath for bridge cables under alternating action of ultraviolet and fatigue loads

doi: 10.19818/j.cnki.1671-1637.2025.02.015
Funds:

National Natural Science Foundation of China 52108163

National Natural Science Foundation of China 52208194

Natural Science Foundation Key Program of Tianjin 23JCZDJC00510

Science and Technology Project of Jiangxi Provincial Department of Transportation 2021H0006

Science and Technology Project of Jiangxi Provincial Department of Transportation 2022H0026

More Information
  • Corresponding author: WANG Bao-lin (1984-), male, senior engineer, 154674560@qq.com
  • Received Date: 2024-03-21
  • Publish Date: 2025-04-28
  • To reveal the moisture diffusion mechanism of cracked high density polyethylene (HDPE) sheaths in cable-bearing systems of bridges in service, prefabricated-slot sheaths were subjected to alternating ultraviolet and fatigue loads to generate fatigue cracks. Based on this, moisture diffusion tests on cracked sheaths were conducted, the equivalent crack area of the sheath was defined, and the variation laws of moisture diffusion flux and diffusion coefficient were revealed. Research results show that only ultraviolet exposure does not significantly change the moisture diffusion behavior of the cracked sheath. In contrast, when the fatigue load cycles increase from 4.50×104 to 1.35×105, the moisture diffusion flux and diffusion coefficient both increase by 6.16% under only fatigue load. When the crack area of the specimen is small, the moisture diffusivity of the sheath is mainly influenced by fatigue load. Considering alternating ultraviolet and fatigue loads, compared to only fatigue loads, single and two alternating actions can increase the moisture diffusion flux and diffusion coefficient by 4.80% and 8.57%, respectively. The sequence of alternating actions also affects the moisture diffusion law in the cracked sheath. Ultraviolet conducted at first can enhance the effect of fatigue load, increasing the moisture diffusion flux and diffusion coefficient by 8.42% under the same fatigue load cycles. When ultraviolet exposure is applied later, the results for single alternating action are similar to those under only fatigue loads, while two alternating actions only increase the values by 4.49%. Therefore, it is considered that only ultraviolet or fatigue loads are insufficient to fully explain the moisture diffusion law in cracked sheaths during service. Predicting the moisture accumulation law within the cable sheath requires a comprehensive consideration of the coupled effects of ultraviolet and fatigue loads. These findings can provide a basis for the maintenance and repair of bridge cables, thereby extending the service life of cable-supported bridges.

     

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