Volume 26 Issue 6
Jun.  2026
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PAN Ren-sheng, ZOU Ze-peng, ZHOU Xuan, GONG Zhen-min, PENG Jian-xin. Mechanical performance of UHPC keyed epoxy joints under combined bending and shear action[J]. Journal of Traffic and Transportation Engineering, 2026, 26(6): 52-62. doi: 10.19818/j.cnki.1671-1637.2026.235
Citation: PAN Ren-sheng, ZOU Ze-peng, ZHOU Xuan, GONG Zhen-min, PENG Jian-xin. Mechanical performance of UHPC keyed epoxy joints under combined bending and shear action[J]. Journal of Traffic and Transportation Engineering, 2026, 26(6): 52-62. doi: 10.19818/j.cnki.1671-1637.2026.235
shu

Mechanical performance of UHPC keyed epoxy joints under combined bending and shear action

doi: 10.19818/j.cnki.1671-1637.2026.235
  • 1.

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

  • 2.

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

  • 3.

    Hunan Provincial Communications Planning, Survey & Design Institute Co., Ltd., Changsha 410200, Hunan, China

Funds:

National Natural Science Foundation of China 51808055

Excellent Youth Project of Hunan Province Education Department 18B131

Hunan Provincial Postgraduate Research Innovation Project CX20230870

More Information
  • Corresponding author: PAN Ren-sheng, associate professor, PhD, E-mail: panrshc@163.com
  • Received Date: 2025-10-31
  • Accepted Date: 2026-03-23
  • Rev Recd Date: 2025-12-29
  • Publish Date: 2026-06-28
    Abstract
  • To investigate the mechanical performance of keyed epoxy joints in ultra-high-performance concrete (UHPC) under combined bending and shear action, shear tests on 14 UHPC keyed epoxy joints were conducted with parameters including the bending-shear ratio (a/h), lateral stress, and steel fiber content (0-2%). The failure modes, interface relative sliding, and shear strength variation laws of the specimens under combined bending and shear action were studied. According to the results, the shear strength of UHPC keyed epoxy joints decreases with the higher bending-shear ratio on the whole. However, there is an obvious boundary bending-shear ratio for the influence of the bending-shear ratio on the shear strength. When a/h≤0.4, the influence of the bending-shear ratio on the joint shear strength is small. When a/h>0.4, the influence of the higher bending-shear ratio is relatively significant. When the UHPC steel fiber content increases from 0 to 2%, the shear strength of the combined bending and shear joint specimens rises by 50.3%. The shear strength of both direct shear and bending-shear joint specimens exhibits a linear growth trend with the increase of lateral stress. When the bending-shear ratio is relatively large, the higher lateral stress significantly enhances the shear strength of the joint, indicating an interactive effect between lateral stress and the bending-shear ratio on the joint shear strength. Based on the experimental data, a shear capacity calculation formula for the UHPC keyed epoxy joint was proposed considering the bending moment. Verification results demonstrate a good agreement between the calculated results and the experimental data.

     

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