An Analytical Method to Detect the Coupling Damage Relationship of Concrete Subjected to Bending Fatigue and Temperature Actions

Based on the assumptions validated by the experiments, an analytical method to detect the coupling actions of bending fatigue and temperature on concrete was proposed. To this purpose, a coefficient denoted by f(D)(T) with the strain distributions caused by these two actions was defined. In terms of the known parameters and the fitted functions of strain, the explicit expression for f(D)(T) which develops in the way same as the law of temperature change in the body of specimens was obtained. Our experimental results indicate that the weigh fraction of temperature stress decreases in the coupling damage field with the fading temperature gradient, and consequently disclose the mutual influence between these two types of actions in the loading history.