Volume 25 Issue 5
Oct.  2025
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YANG Xiao-qiang, ZHANG Yuan, ZHU Li-guo, LAI Zhi-chao. Lateral impact behavior of high-performance concrete-filled steel tubular composite structural members[J]. Journal of Traffic and Transportation Engineering, 2025, 25(5): 399-413. doi: 10.19818/j.cnki.1671-1637.2025.05.026
Citation: YANG Xiao-qiang, ZHANG Yuan, ZHU Li-guo, LAI Zhi-chao. Lateral impact behavior of high-performance concrete-filled steel tubular composite structural members[J]. Journal of Traffic and Transportation Engineering, 2025, 25(5): 399-413. doi: 10.19818/j.cnki.1671-1637.2025.05.026
shu

Lateral impact behavior of high-performance concrete-filled steel tubular composite structural members

doi: 10.19818/j.cnki.1671-1637.2025.05.026

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

Funds:

National Natural Science Foundation of China 52108122

Natural Science Foundation of Fujian Province 2022J05022

More Information
  • Corresponding author: LAI Zhi-chao (1986-), male, professor, PhD, laiz@fzu.edu.cn
  • Received Date: 2025-03-11
  • Accepted Date: 2025-08-25
  • Rev Recd Date: 2025-07-05
  • Publish Date: 2025-10-28
    Abstract
  • Four square high-performance concrete-filled steel tubular (HPCFST) composite structural members were designed and fabricated, considering the influence of different concrete types, including C80 high-strength concrete and ultra-high-performance concrete (UHPC). Lateral impact tests were conducted using a drop-weight testing machine to evaluate critical performance indicators such as impact force, deformation, and energy absorption. A finite element (FE) model was developed, calibrated, and utilized for parametric analyses focusing on reinforcement configuration, thickness of steel tube, strength of steel tube, and axial compression ratio. Analysis results show that the composite structural members with both internal and external concrete being UHPC can withstand lateral impacts of greater energy. The impact resistance of UHPC reinforced composite structural members is significantly superior to those reinforced with C80 high-strength concrete, whose plateau value of impact force shows an approximately 10% improvement, while peak mid-span displacement and residual deformation are reduced by 11.2% and 21.6%, respectively. The established FE model achieves good agreement with experimental results in terms of impact force and deformation, which validates its reliability. Parametric analysis reveals that increasing thickness and strength of steel tube significantly increases the plateau value of impact force and reduces peak mid-span displacement, thereby improving impact resistance of the member. The inclusion of steel rebars in encased concrete can effectively enhance the impact resistance of members compared to plain concrete. However, once the minimum reinforcement ratio is satisfied, further increases in the quantity and diameter of rebars have limited effects on improving impact resistance of members. The influence of the axial compression ratio within 0.1 on the member is limited, but the further increase of the axial compression ratio will significantly weaken the impact resistance of the member, until the instability failure occurs. These findings illustrate the excellent impact resistance of HPCFST composite structural members and further enhance the application potential of such members in long-span tall-pier bridges.

     

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