Residual fatigue strength and stiffness of ordinary concrete under bending

On the basis of the fatigue equation that had been previously proposed by the authors, a new formula for predicting the residual fatigue strength of ordinary concrete was deduced. This formula was further verified and modified by the flexural tests on the concrete beam specimens and compared with other previous test data. Also, some residual fatigue stiffness properties of concrete such as Young's modulus, Poisson's ratio and shear modulus were investigated using non-destructive testing techniques. There was a good correlation between the stiffness properties and the residual fatigue strength.