How we can calculate the width of shear flow zone in RC members subjected to torsion, theoretically?

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Why 0.2 mm crack width?

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Assume that there is no differential settlement.

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Amjad Albayati

you can calculate it by using softened truss model thory

Nazar K Ali Oukaili

use truss analogy method

Mohannad H. Al-Sherrawi

This link may be helpful for you

http://www.xiaonianduan.com/media/Thomas_T_C_Hsu_Shear_Flow_Zone_in_Torsion_of_Reinforced_Concrete.pdf

Thank you Dr. Mohannad.

Abbas AbdulMajeed Allawi

Thanks all for your voluble comments.