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Synopsis Confinement of concrete by rectilinear lateral reinforcement is discussed. An experimental investigation is described in which the main variables were: concrete strength; size, spacing and grade of lateral reinforcement; strain gradient; and thickness of cover. In the analysis of test results, laterally reinforced specimens are treated as composite members consisting of core and cover. The parameters of an analytical stress-strain relationship, which was found to describe the mechanical properties of plain and laterally reinforced concrete adequately, are determined from a regression analysis of the test results. The experimental results are compared with the strength of confined concrete as predicted by (1) a formula based on a theoretical analysis, and (2) an equation which unifies several previously proposed formulae giving the strength of laterally reinforced concrete.
Sargin et al. (Wed,) studied this question.