Abstract
This report is on a study of the compressive tests in high rates of loading on the fourteen kinds of concretes which have been performed by the authors for three years since 1959. At the beginning, the effects of the rate of loading on the compressive strength, modulus of elasticity, strain observed at the maximum stress and absorbed energy of each kinds of concretes were summarized in empirical formulas recpectively. Next, the two equations (Eq. (5), (8) in the text) which were induced from the relations between the rate of stressing and the rate of straining in the tests of specimens, were discussed. The stress-strain curves, compressive strength, etc., culculated from these equations, agreed well with the corresponding values got from the tests directly. These equations, therefore, are useful exceedingly to deduce not only mechanical properties of compressive specimens of concretes, but stress and strains at the failuer of them. Notation of the Leters; ο, ε・・・・・・・・・Average rate of stressing and straining respectively in the range from the beginning to the maximum stress of tests. σ,δ・・・・・・・・・Rate of stressing and straining respectively at a certain value of strain.
