抄録
To estimate the behavior of stirrups, which is necessary for understanding the reason for stirrups rupturing due to Alkali-Silica Reaction (ASR), experiments simulating ASR expansion were conducted. Using 1/4 scale of the actual structure with ruptured stirrups, specimens were made by casting expansive mortar into the square hollow of ordinary concrete set to provide adhesion for the stirrup. FEM analysis was also performed to further evaluate the movement behavior. The results showed that corresponding to external cracking caused by bending and tensile effects, ASR-induced uniform elongation and circular-arc deformation were generated. Further, owing to the influence of circular-arc deformation, angular opening of the corner stirrup with angular increment was verified directly for the bent section of the stirrup. This was confirmed to induce the progress of crack initiations in stirrups and even ruptures.
