Volume 25 Issue 5
Oct.  2025
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PEI Bi-da, ZOU Long-teng, LI Li-feng, RAO Zheng-dong, LU Jie, XIAO Yong-gang, ZOU Ze-peng. Positive bending performance test of UHPC-NC-steel plate composite bridge deck[J]. Journal of Traffic and Transportation Engineering, 2025, 25(5): 342-355. doi: 10.19818/j.cnki.1671-1637.2025.05.004
Citation: PEI Bi-da, ZOU Long-teng, LI Li-feng, RAO Zheng-dong, LU Jie, XIAO Yong-gang, ZOU Ze-peng. Positive bending performance test of UHPC-NC-steel plate composite bridge deck[J]. Journal of Traffic and Transportation Engineering, 2025, 25(5): 342-355. doi: 10.19818/j.cnki.1671-1637.2025.05.004
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Positive bending performance test of UHPC-NC-steel plate composite bridge deck

doi: 10.19818/j.cnki.1671-1637.2025.05.004
  • 1.

    School of Civil Engineering, Changsha University of Science and Technology, Changsha 410114, Hunan, China

  • 2.

    Key Laboratory of Safety Control of Bridge Engineering of Ministry of Education, Changsha University of Science and Technology, Changsha 410114, Hunan, China

  • 3.

    School of Civil Engineering, Hunan University, Changsha 410082, Hunan, China

  • 4.

    Yunnan Construction Infrastructure Investment Co., Ltd., Kunming 650501, Yunnan, China

  • 5.

    Hunan Tianzhu Liujian Concrete Co., Ltd., Changsha 410114, Hunan, China

Funds:

National Natural Science Foundation of China 52278142

Natural Science Foundation of Hunan Province 2021JJ4059

Hunan Provincial Postgraduate Research Innovation Project CX20230870

More Information
  • Corresponding author: LI Li-feng (1971-), male, professor, PhD, lilifeng@hnu.edu.cn
  • Received Date: 2024-07-22
  • Accepted Date: 2025-05-06
  • Rev Recd Date: 2025-03-17
  • Publish Date: 2025-10-28
    Abstract
  • An experimental study was conducted on the bending bearing capacity of a novel UHPC-NC-steel plate composite bridge deck under longitudinal positive bending moments to investigate its longitudinal positive bending performance. The failure modes, bearing capacity, interface slip characteristics, and strain development under positive bending moments were examined. The calculation formulas for the shear capacity of the UHPC-NC interface from different standards were compared, and a calculation and analysis method was proposed for the ultimate bending bearing capacity of UHPC-NC-steel plate composite bridge decks. Experimental results show that before reaching the ultimate load, the deformation of the composite bridge deck cross-section conforms to the plane section assumption, and the initial cracking load of the UHPC-NC-steel plate composite bridge deck under positive bending moment reaches 161 kN. This indicates it possesses excellent crack resistance. The overall relative slip between the UHPC-NC interface and the steel plate-NC interface is small. The relative slip between the two is almost zero. This indicates that the PBL shear keys ensure the collaborative load-bearing of the steel plate and NC layer, making the deformation of the steel plate and NC layer consistent. Upon final failure, shear stress concentration occurs at the UHPC-NC interface after debonding of the interface, leading to shear failure in the NC layer within the shear-bending section. Before shear failure, the composite deck exhibits a series of damage signs, such as 45° diagonal cracks on the side face through the NC layer, transverse cracks in the UHPC-NC interface, and debonding of the UHPC-NC interface. Even after failure, the composite deck retains good ductility. The debonding load value of the NC layer and UHPC layer and the ultimate load value are 753.2 kN and 810.0 kN, respectively. The calculated ultimate positive bending capacity of the UHPC-NC-steel plate composite bridge deck has a coincidence degree of 94% with the experimental results. The calculation results are slightly conservative, which can serve as a reference for similar engineering designs.

     

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