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Introduce the required values and the calculation is automatic. The torsion resistance of your section and the required reinforcement are calculated.

Torsion resistance verification

Explanation

Torsion is defined as the application of a twisting moment on the longitudinal axis of a prismatic piece. The following image shows the application of the strut and tie method to the torsion. This model will give us an idea of the efforts/forces that appear in the concrete and what type of reinforcement will be needed.

Explanation: Read more

Calculation process

Geometric characteristics |
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Height (h) (mm): | ||

Width (b) (mm): | ||

Distance from the bottom face to the center of the reinforcement (R1) (mm): |

Concrete characteristics |
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Concrete compressive characteristic strength (fck) (MPa): | Concrete partial factor: |

Steel characteristics |
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Steel yield limit (fyk) (MPa): | Steel partial factor: |

Loads |
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Torsional moment (kN.m): | |||

Normal force(kN) (Compression +): |
Fill in only for the calculation of the compression strut resistance and for the calculation of the shear-torsion interaction | ||

Vertical shear force (Following h)(kN): | Fill in only for the interaction Torsion-Shear |

Longitudinal reinforcement (Only for the concrete shear resistance - Interaction torsion shear |
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Lower reinforcement (A1) (mm^2): | Fill in only to calculate the interaction with the shear force, to calculae the concrete shear resistance |

Capacity of the concrete struts calculation factors and the additional longitudinal required reinforcement |
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Cracked concrete reduction factor (V1) (The EC-2 recommended value is automatically proposed): | State of stress in the compression chord coefficient (α cw) (EC-2 calculated coefficient, it is conservative to consider it equal to 1): | ||

cot(θ) (1 ≤ cot(θ)≤ 2.5) : |

Display torsion concrete resistance

Results: |
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Ratio of torsion concrete resistance | Automatic calculation after introducing all the input data | ||

Additional longitudinal reinforcerment needed for the torsion | Automatic calculation after introducing all the input data | ||

Ratio of the strut in compression | Automatic calculation after introducing all the input data |

Display torsion-shear interaction formulas

Results of the interaction torsion-shear: |
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Ratio of torsion concrete resistance | Automatic calculation after introducing all the input data | ||

Ratio of the strut in compression considering the shear interaction | Automatic calculation after introducing all the input data |

Display torsion and shear reinforcement calculation formulas

Shear reinforcement required: |
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Torsion transversal reinforcement required | Automatic calculation after introducing all the input data | ||

Shear transversal reinforcement required | Automatic calculation after introducing all the input data |

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The author of this website is not responsible for any possible error in the formulation used. The user has to verify all the results by his own.