Abstract
A method was contrived for establishment of the average stress-strain curve. Strain values corresponding to the specified stress were averaged out from the relative stress-strain curves to estimate the average ascending branch. The established average stress-strain curves were applied for the evaluation of the damaged concrete. Tests of several types of limited cyclic loadings, namely damage, were conducted on specimens to determine the shape change of each type of stress-strain curve under compression.The obtained diagrams of the average stress-strain curves subjected such loadings were presented Observation of the average stress-strain curves showed that, even in a small damage, the concrete would change the ascending branch of the stress-strain curve to the downward than that obtained from monotonically loaded reference concrete specimens. These findings imply the possibility to estimate the magnitude of damage by means of the shape change on the average stress-strain curve. The results, indieated in this paper, demonstrated the ability of the average stress-strain curve for detection of the damage applied to the concrete.
