The Plasticity Ratio of Concrete and It's Effect on the Ultimate Strength of Beamse
V. P. Jensen
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The hypothesis is advanced that the stress-strain diagram for concrete under short-time loading may be idealized for certain purposes so as to consist of two linear parts, one representing elastic behavior and the other representing plastic behavior. The former is measured by the modular ratiowhich is defined as the ratio of the modulus of elasticity of steel to the initial modulus of elasticity of con- crete. The latter is measured by the plasticity ratio which is defined as the ratio of the plastic strain to the total strain at rupture of the concrete. An empirical equation is given to express the relation- ship between the plasticity ratio and the compressive strength of concrete made with gravel or crushed stone aggregate. Formulas are derived for the ulti- mate strength of beams reinforced in tension only. From published results of tests of beams which have failed by compression, experimental evidence is pre- sented which justifies the concept of the plasticity ratio as a function of the compressive strength of concrete. .