Abstract
This paper presents the results of investigations undertaken on the effect of steel fibres on the behaviour and strength of fibre reinforced prestressed concrete beams (with parabolic cables) under shear. Tests were carried out on eight post tensioned beams, including two companion bonded and unbonded prestressed beams without fibres. Both bonded and unbonded beams were studied at different contents ranging from 0% to 0.75%. The fibrous prestressed beams showed marked improvement in first crack load and ultimate load over that of plain prestressed concrete beams. The theoretical prediction of ultimate shear strength from a knowledge of the fiber properties, the cube strength, amount of tensile reinforcement and the applied prestress has been compared with experimental results. The predictions obtained by the theoretical model were found to be satisfactory. (A) For the covering abstract of the conference see IRRD 862056.
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