Equilibrium Torsion

This case occurs when the torsional moment is required to be in equilibrium and maximum torsional moment (Tu) cannot be reduced by redistribution of moments. In this case the torsion reinforcement must be provided to resist all of Tu. This type of torsion is also known as primary torsion.

Example: An edge beam supporting cantilever slab.

equlibrium torsion

Compatibility Torsion

This case occurs when the torsional moment can be reduced by the redistribution of internal forces while compatibility of deformation is maintained in the member. This type of torsion is also known as secondary torsion.

Example: An edge beam supporting two transverse beams producing twisting moment.

Compatibility Torsion

 

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