## Abstract

The role of the shear cracking angle is crucial for accurately estimating shear strengths of reinforced concrete (RC) members. Existing shear design expressions in the KCI-17, ACI318-19, and EC2-04 codes consider the effect of the shear crack angle in different ways. In this study, a new shear design code model was proposed by introducing a simple equation for the shear crack angle. The equation was developed based on an analysis of 244 RC beam test results from various literature sources. The minimum shear crack angle was set at 28 degrees, taking into account the shear strength of concrete and the minimum shear reinforcement ratio specified in the KCI-17 code. The proposed equation accurately evaluated the shear crack angles of the test specimens. Additionally, a simplified equation for calculating the crack angle was derived, and it was found that the shear crack angles obtained from the detailed equation and the simplified equation aligned well.

Original language | English |
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Pages (from-to) | 367-377 |

Number of pages | 11 |

Journal | Journal of the Korea Concrete Institute |

Volume | 35 |

Issue number | 4 |

DOIs | |

State | Published - Aug 2023 |

## Keywords

- minimum shear crack angle
- shear strength
- truss model
- variable crack angle