Volume 26 Issue 7
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KONG Wen-yuan, XING Zhi-quan, CHEN Li-bo, ZHENG Li, WU Xiao-lei, CHEN Yu. Axial compression performance of CFST pier column under long-term load reinforced by encased UHPC[J]. Journal of Traffic and Transportation Engineering, 2026, 26(7): 81-97. doi: 10.19818/j.cnki.1671-1637.2026.011
Citation: KONG Wen-yuan, XING Zhi-quan, CHEN Li-bo, ZHENG Li, WU Xiao-lei, CHEN Yu. Axial compression performance of CFST pier column under long-term load reinforced by encased UHPC[J]. Journal of Traffic and Transportation Engineering, 2026, 26(7): 81-97. doi: 10.19818/j.cnki.1671-1637.2026.011
shu

Axial compression performance of CFST pier column under long-term load reinforced by encased UHPC

doi: 10.19818/j.cnki.1671-1637.2026.011
  • 1.

    College of Civil Engineering, Fuzhou University, Fuzhou 350108, Fujian, China

  • 2.

    Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education, Beijing University of Technology, Beijing 100124, China

  • 3.

    International and Hong Kong, Macao and Taiwan Connection Laboratory of Structural Engineering, Fuzhou University, Fuzhou 350116, Fujian, China

  • 4.

    Fujian Construction Engineering Group Co., Ltd., Fuzhou 350003, Fujian, China

  • 5.

    Zhongqing Construction Co., Ltd., Changchun 130000, Jilin, China

Funds:

University Industry-study-research Cooperation Project of Fujian Province Science and Technology Department 2024Y4013

Science and Technology Plan Project of Housing and Urban-rural Construction Industry of Fujian Province 2022-K-083

Science and Technology Plan Project of Housing and Urban-rural Construction Industry of Fujian Province 2023-K-65

Science and Technology Plan Project of Housing and Urban-rural Construction Industry of Fujian Province 2023-K-96

National College Students Innovation and Entrepreneurship Training Project 202410386018

More Information
  • Corresponding author: CHEN Yu, professor, PhD, E-mail: yuchen@bjut.edu.cn
  • Received Date: 2025-04-03
  • Accepted Date: 2025-08-22
  • Rev Recd Date: 2025-05-14
  • Publish Date: 2026-07-28
    Abstract
  • To investigate the influence of long-term loading on the post-reinforcement performance of pier columns, 20 axial compression specimens were designed with varying long-term load ratios and section reinforcement configurations. A prestressed long-term loading device was employed to apply sustained axial compression to concrete-filled steel tube (CFST) specimens, and the evolution of strain and deformation was monitored. The specimens were subsequently reinforced by encasing ultra-high performance concrete (UHPC) to form composite pier columns, which were then tested under ultimate axial compression. The effects of long-term loading on failure modes and mechanical behavior were systematically analyzed. A finite element model incorporating core concrete shrinkage and creep was established, and parametric studies were conducted to evaluate the influence of sectional parameters on reinforcement efficiency. Based on experimental and numerical results, a predictive formula for the ultimate axial bearing capacity of UHPC-reinforced CFST pier columns accounting for long-term loading effects was proposed. The results indicate that under low long-term load ratios, splitting failure occurs at the ends of the reinforced layer, whereas under high ratios, crushing failure predominates at the mid-height section. Long-term loading induces additional load transfer to the steel tube due to concrete shrinkage and creep, leading to local deformation at the column base and increased mid-span deflection, which impairs deformation compatibility and reduces reinforcement effectiveness. The reinforcement ratio of the encased layer and the long-term load ratio significantly influence the ultimate capacity. A moderate long-term load ratio can moderately improve the mechanical response, while the inclusion of reinforcement in the UHPC layer effectively mitigates the adverse effects of long-term loading, limiting the capacity reduction coefficient to within 10%. A reinforcement ratio exceeding 1% is recommended for practical applications. The proposed formula offers a reliable reference for the design of CFST member reinforcements under long-term loading.

     

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