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Investigations on the influence of radial confinement in the impact response of concrete

  • Al-Salloum, Yousef (MMB Chair for Research and Studies in Strengthening and Rehabilitation of Structures, Department of Civil Engineering, King Saud University) ;
  • Alsayed, Saleh (MMB Chair for Research and Studies in Strengthening and Rehabilitation of Structures, Department of Civil Engineering, King Saud University) ;
  • Almusallam, Tarek (MMB Chair for Research and Studies in Strengthening and Rehabilitation of Structures, Department of Civil Engineering, King Saud University) ;
  • Ibrahim, S.M. (MMB Chair for Research and Studies in Strengthening and Rehabilitation of Structures, Department of Civil Engineering, King Saud University) ;
  • Abbas, H. (MMB Chair for Research and Studies in Strengthening and Rehabilitation of Structures, Department of Civil Engineering, King Saud University)
  • Received : 2013.06.25
  • Accepted : 2014.10.01
  • Published : 2014.12.25

Abstract

Annular and solid concrete specimens with different aspect ratios and static unconfined compressive strengths were studied for impact loading using SHPB test setup. Numerical simulations in LSDYNA were also carried out and results were validated. The stress-strain curves obtained under dynamic loading were also compared with static compressive tests. The mode of failure of concrete specimen was a typical ductile failure at high strain rates. In general, the dynamic increase factor (DIF) of thin solid specimens was higher than thick samples. In the numerical study, the variation of axial, hydrostatic and radial stresses for solid and annular samples was studied. The core phenomenon due to confinement was observed for solid samples wherein the applied loads were primarily borne by the innermost concrete zone rather than the outer peripheral zone. In the annular samples, especially with large diameter inside hole, the distribution of stresses was relatively uniform along the radial distance. Qualitatively, only a small change in the distribution of stresses for annular samples with different internal diameters studied was observed.

Keywords

concrete;confinement;SHPB;strain rate;impact

Acknowledgement

Supported by : NSTIP

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