Abstract
The paper presents the results of an experimental investigation into the combined influence of stirrup and steel fibre reinforcement on the strength and deformation characteristics of conventionally reinforced concrete compression members. Columns, 150 × 150 × 750 mm, were reinforced longitudinally and stirrup reinforcement was provided at spacings of 125, 187 and 375 mm, the former spacing being according to CP 110. Melt extract steel fibres were used for reinforcement at volumes ranging between 0 and 3%. The results indicate that a combination of small stirrup spacing and high fibre volume leads to a marked increase in the ductility of the compression members. This is indicated by an increased energy absorption capacity of the column specimens and high lateral strain capacity and Poisson's ratio of the concrete phase within the columns. In addition, the crack initiation and critical stress levels of the concrete phase decrease with increasing fibre volume indicating thereby a greater degree of inelasticity which leads to a more ductile behaviour. The strength of the compression members is unaffected by either steel fibre volume or stirrup spacing.
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