Abstract
To estimate the behavior of stirrup, which is significant for the fracture around stirrup due to ASR, specimen with expansive mortar cast into the frame of ordinary concrete is conducted. Besides, to reproduce experimental results and further to study the movement mechanisms, FEM analysis is carried out. The ASR-induced circular and elongated deformation around 5.0mm and 3.0mm is generated for both experiment and analysis. From the analytical results, uniform increment of element length due to expansion cause the tensile effect in frame concrete which further induce the elongated deformation; while difference of expansion in different area due to the bending rigidity produce the bending effect and thus circular deformation. In addition, by circular deformation, angular increment near 2.5° is verified for bent part of stirrup. This is responsible for progressing of initial damage until to fracture.
