Abstract
The paper studies the influence of steel fibres on the torsional and flexural rigidity of concrete beams. Ultimate load tests were carried out on square beams subjected to pure torsion and on rectangular beams subjected to combined bending and torsion. Steel fibres with a length/diameter ratio of 150 were used and the increases in torsional capacity and tensile strength were studied. Fibre reinforced beams were found to have a considerable post-ultimate reserve and pronounced ductility in torsion and in combined bending and torsion. Flexural loads did not cause any reduction in torsional capacity. Satisfactory predictions of ultimate torque were obtained by using sand-heap analogy and a reduced value for the tensile strength of concrete. (a) (TRRL)
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