2022 Volume 33 Pages 33-42
In seismic retrofitting of existing reinforced concrete structures, additional members are generally connected to existing members by using post-installed anchors and a roughened concrete surface. To date, however, little research has focused on these hybrid joints. In this study, shear loading tests on hybrid joint specimens under combined stress were conducted. In addition, the shear strength formula and the mechanical model of the roughened surface were proposed based on the authors’ previous findings. As a result, it was found that the shear strength of the roughened surface under combined stress can be properly evaluated. Moreover, the mechanical behavior was reasonably estimated by combining the proposed model and the authors’ previous dowel model.