A view of torsion, Part 2

In Part One, the two mechanisms by which a member can resist torsion were introduced. One of them, so-called ‘warping’, can be simply understood – not as warping but as differential flange bending – and, on its own, simply calculated. The other, named after St Venant, is simple to understand for thin-walled hollow sections, but becomes mathematically demanding for conventional sections. In Part Two, Alastair Hughes describes an escape route for non-mathematicians.

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