Abstract
The paper presents an improved, fracture-mechanics-based formula for estimation of the ultimate shear resistance of steel fibre reinforced concrete beams. The proposed formula was evaluated using 312 published and 28 new test results and its accuracy was compared with 12 already known formulas. Twenty eight tests on reinforced concrete beams subjected to non-symmetrically placed concentrated loads were carried out, in which two different types of steel fibres: short straight and long hooked-end were used. The influence of the volume of fibres on shear resistance and cracking behaviour of the beams for each type of fibre as well as their combination was investigated. The obtained results indicate the validity of the new formula for a wide range of beam and material parameters and prove its applicability for a reasonably precise estimation of the ultimate shear resistance of steel fibre reinforced concrete beams.
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