Torsion stiffness is expressed in the following way:

Where:

Torsion stiffness, stress and angular deflection for common cross sections are calculated in this spreadsheet:
Torsion stiffness is expressed in the following way:

Where:

Torsion stiffness, stress and angular deflection for common cross sections are calculated in this spreadsheet:
Torsion stiffness is expressed in the following way:

Where:

Torsion stiffness, stress and angular deflection for common cross sections are calculated in this spreadsheet: