No abstract

When buildings are seismically retrofitted, new members are connected to existing ones through a roughened concrete surface, which is constructed using a vibration drill. However, there are few studies on such roughened concrete surfaces. When the roughened concrete area ratio is small, supported failure occurs, while when the roughened concrete area ratio is large, shear failure occurs. In the case of support failure, the authors constructed a model that considers the microscopic roughness of the concrete surface. However, the shear failure has not been modeled yet. Therefore, in this study, additional experiments were conducted by constructing a mechanical model for shear failure. The maximum shear stress of the specimen could be calculated by considering the maximum shear stress level, according to Mohr's stress circle, and the roughened concrete area ratio after loading. Furthermore, the mechanical model for shear failure was constructed by using the maximum shear stress and the Hordijk model. Finally, it was demonstrated that the shear stress can be accurately reproduced.