Torsion in beams has been a confusing topic to many civil engineering students and structural engineering students alike.
In the civil engineering text books , torsion is always dealt with an empherical formula as per the IS456
Most of the civil engineering professors also encourages to design for torsion in beams.
However there are some very important basic points that are needed to understand before deciding to design for torsion.The way you look at this torsion is going to make your design economic and uneconomic. The concepts of Equilibrium Torsion and Compatibility torsion needs to be understood carefully and all compatibel torsions can be release there by making the design econmoic than what it will be if done by the emperical method.
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