To study the sharp degradation point of concrete durability, damage at the characteristic failure point under loads was first obtained by the application of the one-dimensional stress-strain relationship of Saenz. Then based on the principle that damage at the characteristic failure point subjected to loads is equal to the damage in accordance with the characteristic point of concrete durability under environmental actions, the sharp degradation point of concrete durability was determined. The results were applied to the case of concrete suffering freeze-thaw actions. Good accordance between experimental results and forecasted results indicated the reliability of this method.
