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Structural Engineering and Mechanics
  Volume 82, Number 1, April10 2022 , pages 81-92

Nonlinear finite element analysis of ultra-high performance fiber reinforced concrete beams subjected to impact loads
Gamze Demirtas, Naci Caglar and Yusuf Sumer

    Ultra-high performance fiber reinforced concrete (UHPFRC) is a composite building material with high ductility, fatigue resistance, fracture toughness, durability, and energy absorption capacity. The aim of this study is to develop a nonlinear finite element model that can simulate the response of the UHPFRC beam exposed to impact loads. A nonlinear finite element model was developed in ABAQUS to simulate the real response of UHPFRC beams. The numerical results showed that the model was highly successful to capture the experimental results of selected beams from the literature. A parametric study was carried out to investigate the effects of reinforcement ratio and impact velocity on the response of the UHPFRC beam in terms of midpoint displacement, impact load value, and residual load-carrying capacity. In the parametric study, the nonlinear analysis was performed in two steps for 12 different finite element models. In the first step, dynamic analysis was performed to monitor the response of the UHPFRC beam under impact loads. In the second step, static analysis was conducted to determine the residual load-carrying capacity of the beams. The parametric study has shown that the reinforcement ratio and the impact velocity affect maximum and residual displacement value substantially.
Key Words
    finite element modeling; impact load; reinforced concrete beam; residual load-carrying capacity; ultra-high performance fiber reinforced concrete
Gamze Demirtas, Naci Caglar: Department of Civil Engineering, Engineering Faculty, Sakarya University, 54050 Sakarya, Turkey
Yusuf Sumer: Department of Civil Engineering, Technology Faculty, Sakarya University of Applied Sciences, 54050 Sakarya, Turkey

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