DETERIORATION LAWS OF CONCRETE ELASTIC MODULUS UNDER FATIGUE LOADING

Based on tests of the C15 concrete inconstant amplitude fatigue, the deterioration laws of elastic modulus ofconcrete under the fatigue loading is analyzed in this paper. The damagevariable is defined as the deterioration of the cyclic unloading secantmodulus, and a mathematical model describing the decrease of the modulus with cycle number isgiven. The model can be used to predict the fatigue-life of concrete.