Computers and Concrete

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Numerical analysis on dynamic response and damage assessment of FRP bars reinforced-UHPC composite beams under impact loading

  • Tao Liu (School of Civil Engineering, Hunan University of Science and Technology) ;
  • Qi M. Zhu (School of Civil Engineering, Hunan University of Science and Technology) ;
  • Rong Ge (School of Civil Engineering, Hunan University of Science and Technology) ;
  • Lin Chen (School of Civil Engineering, Hunan University of Science and Technology) ;
  • Seongwon Hong (Department of Safety Engineering, Korea National University of Transportation)
  • Received : 2024.01.11
  • Accepted : 2024.02.29
  • Published : 2024.10.25
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Abstract

This paper utilizes LS-DYNA software to numerically investigate impact response and damage evaluation of fiber-reinforced polymer (FRP) bars-reinforced ultra-high-performance concrete (UHPC) composite beams (FRP-UHPC beams). Three-dimensional finite element (FE) models are established and calibrated by using literature-based static and impact tests, demonstrating high accuracy in simulating FRP-UHPC beams under impact loading. Parametric analyses explore the effects of impact mass, impactor height, FRP bar type and diameter, and clear span length on dynamic response and damage modes. Two failure modes emerge: tensile failure with bottom longitudinal reinforcement fracture and compression failure with local concrete compression near the impact region. Impact mass or height variation under the same impact energy significantly affects the first peak impact force, but minimally influences peak midspan displacement with a difference of no more than 5% and damage patterns. Increasing static flexural load-carrying capacity enhances FRP-UHPC beam impact resistance, reducing displacement deformation by up to 30%. Despite similar static load-carrying capacities, different FRP bars result in varied impact resistance. The paper proposes a damage assessment index based on impact energy, static load-carrying capacity, and clear span length, correlating well with beam end rotation. Their linearly-fitting coefficient was 1.285, 1.512, and 1.709 for the cases with CFRP, GFRP, and BFRP bars, respectively. This index establishes a foundation for an impact-resistant design method, including a simplified formula for peak midspan displacement assessment.

Keywords

Acknowledgement

The research work was supported by the Hunan Provincial Natural Science Foundation of China (Grant No. 2024JJ9066, 2023JJ70006), the National Natural Science Foundation of China (52278500), the Research Foundation of Education Bureau of Hunan Province of China (21B0470, 21A0293), Basic Science Research Program through the National Research Foundation of Korea(NRF) funded by the Ministry of Education (2021R1A4A2001964), and Mid-Career Researcher and Young Researcher Programs through the National Research Foundation of Korea (NRF) funded by the Korea government (MSIT; Ministry of Science and ICT (2023R1A2C2006400 and 2021R1C1C1010087)).

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