An earlier paper by Purkiss & Blagojevic (Composite Struct., 25, 45-9, 1993) detailed the results from some load-deflection tests on two sets of beams. The first set were reinforced both with two number 8 mm high yield bars and with steel fibres. The second set as a comparison had only high yield bars. The results reported indicated that at a given load the beams with fibres produced lower deflections and did not give such an extensive 'yield plateau' as those beams without fibres. Using a method proposed by Hsu et al. (ACI Struct. J., 89, 650-7, 1992), albeit modified to allow for the tension stiffening of the concrete and the use of a continuous function for the reinforcing bar stress-strain relationship, the theoretical deformations and crack widths may be calculated.
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