Advances in concrete construction

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Effect of shear-span/depth ratio on cohesive crack and double-K fracture parameters of concrete

  • Choubey, Rajendra Kumar (Department of Civil Engineering, Institute of Technology, Guru Ghasidas Vishwavidyalaya (A Central University)) ;
  • Kumar, Shailendra (Department of Civil Engineering, Institute of Technology, Guru Ghasidas Vishwavidyalaya (A Central University)) ;
  • Rao, M.C. (Department of Civil Engineering, Institute of Technology, Guru Ghasidas Vishwavidyalaya (A Central University))
  • Received : 2014.01.01
  • Accepted : 2014.11.07
  • Published : 2014.11.27
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Abstract

A numerical study of the influence of shear-span/depth ratio on the cohesive crack fracture parameters and double - K fracture parameters of concrete is carried out in this paper. For the study the standard bending specimen geometry loaded with four point bending test is used. For four point loading, the shear - span/depth ratio is varied as 0.4, 1 and 1.75 and the ao/D ratio is varied from 0.2, 0.3 and 0.4 for laboratory specimens having size range from 100 - 500 mm. The input parameters for determining the double - K fracture parameters are taken from the developed fictitious crack model. It is found that the cohesive crack fracture parameters are independent of shear-span/depth ratio. Further, the unstable fracture toughness of double-K fracture model is independent of shear-span/depth ratio whereas, the initial cracking toughness of the material is dependent on the shear-span/depth ratio.

Keywords

Acknowledgement

Supported by : UGC

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