Abstract
Tests have been carried out on nineteen I-section specimens in pure torsion to find the torque carrying capacity with restraint of warping.The specimens were machined out of a solid bar and warping restraint was provided by leaving the ends of the specimen solid. Four different I-sections and a series of different lengths of each section have been tested.As might be expected the results show that the torque carrying capacity of an I-section with warping restraint is considerably higher than the sand-heap value. The results are discussed in terms of various theories and it is shown that none of the present theories predict values as high as the experimental values especially for I-sections with thick webs.
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