Abstract
In the present paper, some formulae concerning the bending torsion of the simply supported beam with ∏ shape section, are described from H. Wagner's and Goodier-Barton's theory; and then other formulae which coincide, in particular case where the span length is much longer than the breadth, with those from H. Wagner's theory, are obtained by the precise analysis. Lastly, the effects of the local torsion due to the side girders are discussed and some numerical values of stresses are given for comparison.
