Steel and Composite Structures

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Impact response of ultra-high performance fiber-reinforced concrete filled square double-skin steel tubular columns

  • Li, Jie (Tianjin Key Laboratory of Civil Structure Protection and Reinforcement, Tianjin Chengjian University) ;
  • Wang, Weiqiang (College of Water Conservancy and Hydropower Engineering, Hohai University) ;
  • Wu, Chengqing (School of Civil and Environmental Engineering, University of Technology Sydney) ;
  • Liu, Zhongxian (Tianjin Key Laboratory of Civil Structure Protection and Reinforcement, Tianjin Chengjian University) ;
  • Wu, Pengtao (Tianjin Key Laboratory of Civil Structure Protection and Reinforcement, Tianjin Chengjian University)
  • Received : 2021.01.15
  • Accepted : 2021.11.16
  • Published : 2022.02.10
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Abstract

This paper studies the lateral impact behavior of ultra-high performance fiber-reinforced concrete (UHPFRC) filled double-skin steel tubular (UHPFRCFDST) columns. The impact force, midspan deflection, and strain histories were recorded. Based on the test results, the influences of drop height, axial load, concrete type, and steel tube wall thickness on the impact resistance of UHPFRCFDST members were analyzed. LS-DYNA software was used to establish a finite element (FE) model of UHPFRC filled steel tubular members. The failure modes and histories of impact force and midspan deflection of specimens were obtained. The simulation results were compared to the test results, which demonstrated the accuracy of the finite element analysis (FEA) model. Finally, the effects of the steel tube thickness, impact energy, type of concrete and impact indenter shape, and void ratio on the lateral impact performances of the UHPFRCFDST columns were analyzed.

Keywords

Acknowledgement

This work was supported by the National Natural Science Foundation of China (Grant No.51978186), Tianjin City Science and Technology Support Program (Grant No.19YFZCSN01180), and Tianjin City Science and Technology Support Program (Grant No.17YFZCSF01140).

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