Computers and Concrete

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Mechanical behavior and numerical modelling of steel fiber reinforced concrete under triaxial compression

  • Bu Jingwu (College of Hydraulic Science and Engineering, Yangzhou University) ;
  • Xu Huiying (College of Hydraulic Science and Engineering, Yangzhou University) ;
  • Wu Xinyu (College of Hydraulic Science and Engineering, Yangzhou University) ;
  • Chen Xudong (College of Civil and Transportation Engineering, Hohai University) ;
  • Xu Bo (College of Hydraulic Science and Engineering, Yangzhou University)
  • Received : 2022.01.06
  • Accepted : 2023.07.04
  • Published : 2024.08.25
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Abstract

In order to study the triaxial mechanical behavior of steel fiber reinforced high performance concrete (SFRHPC), the standard triaxial compression tests with four different confining pressures are performed on the cylindrical specimens. Three different steel fiber volumes (0, 1% and 2%) are added in the specimens with diameter of 50 mm and height of 100 mm. Test results show that the triaxial compressive strength and peak strain increase with the increasing of fiber content at the same confining pressure. At the same steel fiber content, the triaxial compressive strength and peak strain increases with the confining pressure. The compressive strength growth rate declines as the confining pressure and steel fiber content increases. Longitudinal cracks are dominant in specimens with or without steel fiber under uniaxial compression loading. While with the confining pressure increases, diagonal crack due to shear is obvious. The Mohr-Coulomb criterion is illustrated can be used to describe the failure behavior, and the cohesive force increases as steel fiber content increases. Finally, the numerical model is built by using the PFC3D software. In the numerical model a index is introduced to reflect the effect of steel fiber content on the triaxial compressive behavior. The simulating stress-strain curve and failure mode of SFRHPC are agree well with the experimental results.

Keywords

Acknowledgement

The authors would like to acknowledge the support from the national natural science foundation of china (Nos.51809227, 52079120).

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