Computers and Concrete

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Study on fracture characteristics of reinforced concrete wedge splitting tests

  • HU, Shaowei (Materials & Structural Engineering Department, Nanjing Hydraulic Research Institute) ;
  • XU, Aiqing (College of Mechanics and Materials, Hohai University) ;
  • HU, Xin (Materials & Structural Engineering Department, Nanjing Hydraulic Research Institute) ;
  • YIN, Yangyang (College of Mechanics and Materials, Hohai University)
  • Received : 2015.09.25
  • Accepted : 2016.04.26
  • Published : 2016.09.25
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Abstract

To study the influence on fracture properties of reinforced concrete wedge splitting test specimens by the addition of reinforcement, and the restriction of steel bars on crack propagation, 7 groups reinforced concrete specimens of different reinforcement position and 1 group plain concrete specimens with the same size factors were designed and constructed for the tests. Based on the double-K fracture criterion and tests, fracture toughness calculation model which was suitable for reinforced concrete wedge splitting tensile specimens has been obtained. The results show that: the value of initial craking load Pini and unstable fracture load Pun decreases gradually with the distance of reinforcement away from specimens's top. Compared with plain concrete specimens, addition of steel bar can reduce the value of initial fracture toughness KIini, but significantly increase the value of the critical effective crack length ac and unstable fracture toughness KIun. For tensional concrete member, the effect of anti-cracking by reinforcement was mainly acted after cracking, the best function of preventing fracture initiation was when the steel bar was placed in the middle of the crack, and when the reinforcement was across the crack and located away from crack tip, it plays the best role in inhibiting the extension of crack.

Keywords

Acknowledgement

Supported by : The National Science Fund for Distinguished Young Scholars, The National Natural Science Foundation of China

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