ABSTRACT
Concrete bridges built in the seaside and frozen environment have been damaged due to the salty attacking. In the health monitoring of these concrete bridges, it is important to evaluate the relationship between the structural performance and the state of destructions in order to conduct maintenance works. In this study, a full scale PCT girder, which was removed at nearly 25-years after construction due to salt damage, have been evaluated to figure out the sensitivity of several damage detection, residual load-bearing capacity and deformations due to destructive test. As a result, even though many damages are observed, the investigated PCT girder performed a sufficient load-bearing capacity. In addition, non-destructive test, i.e. the remaining pre-stress estimation and grout filling, also plays effective role in this study. Furthermore, a novel damage indicator, called Displacement Assurance Criterion (DAC), based on changes of displacement of each observed points, has been taken into consideration and found as the sensitive damage detection approach.
